Diamond Bar City Council
March 17, 2026

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
employment to ensure long-term fiscal sustainability and promote conservation of natural open space.

ED-G-2 Economic Development
Provide for the development of jobs and commercial uses within Diamond Bar to reduce residents’ commutes, and to encourage residents to shop and dine locally.

The TCSP envisions the Town Center to become Diamond Bar’s downtown, a mixed-use village setting where the local workforce can live and work, and provide the greater community with more local options to shop and dine.

Community
Development
ED-G-3 Economic Development Support the retention, rehabilitation, and/or expansion of existing businesses, and the attraction of new businesses. See Land Use Goal LU-G-11.

Community
Development
Policies – Commercial Centers
ED-P-3 Economic Development
Create commercial centers or districts that have a sense of place and provide attractive places to shop, dine, and gather. Within these areas, support the development of uses and distinct characters that complement other commercial areas within Diamond Bar and adjacent jurisdictions.

See Land Use Chapter Goal LU-G-4.

Community
Development
Policies – Community-Serving Uses
ED-P-7 Economic Development Allow for home occupations where compatible with the privacy and residential character of the neighborhood.

Home based businesses are allowed, and are required to comply with the operating standards in Diamond Bar City Code Section

22.42.070, where the business shall be incidental and secondary to the residential use of the property. Modifications that alter the character of the residence or change its occupancy classification are prohibited, and activities that create nuisances, such as glare, light, noise, solid waste, or other characteristics in excess of that customarily associated with similar residential uses are prohibited. 95 home-based business licenses were issued in 2025.

Community
Development

2. Community Character & Placemaking
POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT

COMMUNITY CHARACTER & PLACEMAKING
This Chapter guides the physical form and character of the City by providing strategies to strengthen the City’s identity through both new development and public improvements. Placemaking elements include features such as monuments and decorative treatments that define City entry points, public art installations, decorative streetscape elements at key intersections or districts, and landscaping that creates a memorable and unified character. The Goals and Polices contained in this Chapter provide direction to incorporate such elements into both new development projects and public improvements. The majority of the Goals and Policies are related to the new opportunities within the four mixed-use focus areas and encourage walkable and pedestrian-oriented neighborhoods.

OVERALL CHARACTER & DESIGN
Goals

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
CC-G-2 Community Character &
Placemaking
Encourage development within mixed-use areas that is inviting to pedestrians, promotes community interaction and activity, and contributes to an engaging street environment.

See Land Use Chapter Goal LU-G-4 and Policy LU-P-7.

Community
Development
CC-G-4 Community Character &
Placemaking
Preserve the scale and character of existing residential neighborhoods and ensure sensitive transitions between densities and uses.

See Land Use Chapter Goal LU-G-3, Policies LU-P-1 and LU-P-8.

Community
Development
CC-G-5 Community Character &
Placemaking
Provide an expanded pedestrian and bicycle infrastructure network to improve connectivity throughout the city where topography and technology permit.

Diamond Bar Boulevard Complete Streets Corridor
In November 2025, the City Council awarded a $8.8M construction contract award for the Diamond Bar Boulevard Complete Streets Project. The City secured adequate grant funding for the costs of the construction phase. A pre-construction meeting with the contractor was held in December 2025, and work is planned to start in February 2026. The project is planned for completion in February 2027.

Public Works
CC-G-6 Community Character &
Placemaking
Encourage high-quality, human-scaled design and development that respects the surrounding built environment while offering a diversity of building types.

See Land Use Chapter Goal LU-G-3.

Community
Development
Policies – City Identity
CC-P-2 Community Character &
Placemaking
Incorporate prominent corner architectural features, such as prominent entries or corner towers, on new development at key intersections or gateways.

See Community Character & Placemaking Chapter Goal CC-G-5 for update on the Diamond Bar Boulevard Complete Streets Project.

Public Works
CC-P-5 Community Character &
Placemaking
Establish a landscaping palette made up of native, drought-tolerant plants and stormwater management systems with a view to enhancing beautification and sustainable landscaping practices.

See Land Use & Economic Development Chapter Policy LU-P-5 and Community Character & Placemaking Chapter Goal CC-G-5 and Policy CC-P-1.

The streetscape design in the TCSP project area will be centered around reducing the number of years to carbon neutral/zero carbon in order to reduce the effects of climate change by planting evergreen trees and installation of cool pavements such as hydro pavers.

As part of the FY2025-26 Capital Improvement Program, the City Council approved the development of landscaping and irrigation standards for Landscape Assessment District Nos. 39-2022 and 41- 2021. The awarded consultant will evaluate the existing conditions and recommend standardized improvements for district-maintained areas. The improvements include the removal of nonfunctional turf areas, and prioritize the use of drought-tolerant plants and water efficient irrigation systems.

Community
Development
Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
CC-P-6 Community Character &
Placemaking
Prioritize sustainability in site design. When incorporating on-site stormwater management through the use of bioswales, rain gardens, permeable pavement, and/or other available low-impact development technologies, require such features to be aesthetically integrated into the site design.

The City requires developers to responsibly manage and mitigate the stormwater quality impacts from their projects, in compliance with the City’s MS4 Permit and NPDES Program. Every project’s proposed Low Impact Development (LID) best management
practices are reviewed and approved by the City.

Public Works
Policies – Streetscapes & Building to Street Interface
CC-P-9 Community Character &
Placemaking
Encourage pedestrian orientation in mixed-use development using a variety of site planning and architectural strategies, such as locating and orienting buildings to street frontages, plazas, or pedestrian paseos; providing visual transparency through fenestration; entries and arcades close to the street edge and sidewalk; and/or incorporating porches, patios, or outdoor spaces that overlook or interact with front yards or sidewalks.

The TSCP is intended to create vibrant public realm with a high intensity mix of uses to include retail, office, hotel, civic, and residential uses, and a bustling active environment during both day and evening hours. Numerous new public spaces, both hardscape squares and landscaped greener park spaces, will be located throughout the Plan area to provide a variety of environments that will serve residents and downtown visitors alike.

See Land Use Chapter Goal LU-G-4 and LU-P-7 and Community Character & Placemaking Chapter Goal CC-G-5 and Policy CC-P-1 Community
Development
CC-P-11 Community Character &
Placemaking
In residential and mixed-use areas, use traffic calming measures such as pavers, bollards, sidewalk bulb-outs, and speed humps to slow travel speeds.

Neighborhood Traffic Management Program
In August 2025, the City Council approved the installation of 3 new stop signs along Hawkwood Road, at the intersections of Chirping Sparrow Road, Ambushers Street, and Barbi Lane. The
implemented stop signs help establish right-of-way and support safe traffic flow throughout the neighborhood.

Public Works
CC-P-12 Community Character &
Placemaking
Develop and enforce private slope maintenance standards for properties with rear descending slopes that face public streets, with special emphasis on those along Grand Avenue, Diamond Bar Boulevard, Golden Springs Drive, Pathfinder Road, and the freeways.

Private Slopes Affected by the February 2024 Winter Storms Through 2025, the City worked with private property owners to restore the private slopes affected by the February 2024 Winter Storms. A Grading Permit was issued in July 2025 for the property owner to rehabilitate the private slope along Diamond Bar Boulevard. The City continues to work with other affected property owners on restoring the private slopes along Golden Springs Drive.

Public Works
Policies – Parks & Open Spaces
CC-P-13 Community Character &
Placemaking
Encourage landscaped common public spaces to be incorporated into new mixed-use development. See Land Use Chapter Goal LU-G-4 and Policy LU-P-7.

Community
Development
CC-P-16 Community Character &
Placemaking
Ensure that common spaces be integrated elements of
development, coordinating landscaping and amenities with the projects’ architecture and character.

See Land Use Chapter Goal LU-G-4 and Policy LU-P-7.

Community
Development
Policies – Site Planning & Parking

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
CC-P-17 Community Character &
Placemaking
Encourage the aggregation of individual small lots into larger development parcels within mixed-use areas that will support an appropriately-scaled, cohesive and economically viable
development.

See Land Use Chapter Goal LU-G-4.

The TCSP is an important component of the City’s overall strategy to revitalize older areas and expand housing production. Incentives for lot consolidation are being considered as the TCSP is being crafted to encourage the improvement of underutilized properties.

Community
Development
CC-P-18 Community Character &
Placemaking
As large vacant or underutilized sites are developed or redeveloped, maximize multimodal accessibility with fine-grained street networks and walkable block sizes. Generally limit new block sizes to a maximum of about 400 feet in length. Mid-block plazas or alleys may be considered if the intent is to ensure fine-grained patterns where pedestrian access can be accommodated in intervals no more than 400 feet apart.

See Land Use Chapter Goal LU-G-4 and Policy LU-P-7.

Community
Development
CC-P-21 Community Character &
Placemaking
Site plans should be designed to create pedestrian-oriented neighborhoods that follow these guidelines:
a) Buildings should be oriented to the street;
b) Garages and parking areas should be screened and/or
located at the side or rear of properties wherever possible; and
c) Landscaping, sidewalk conditions, and other streetscape elements should be improved during rehabilitation and new construction.

See Land Use Chapter Goal LU-G-4 and Policy LU-P-7.

The planning goals for the TCSP include the following:

1. To implement the community vision, goals and policies of the General Plan, which established the Town Center Mixed-Use land use designation to “foster the development of a vibrant, pedestrian-oriented Town Center in Diamond Bar that serves as a place for Diamond Bar’s residents to shop, dine, and gather.

2. To make the town center a complete neighborhood with a sense of place, that takes advantage of its location, to provide residents and visitors a unique experience.

3. Ensure that the physical design and programming of the town center supports health, wellbeing, and environmental
sustainability, the latter so as to make progress toward meeting the greenhouse gas reduction targets of the
Diamond Bar Climate Action Plan by supporting compact,
infill, mixed-use development.

4. The town center allows for car-lite/car-optional living allowing those who choose not to use their car on a daily basis or who choose not to own a car at all to be easily accommodated thus furthering progress to the City’s climate action goals.

5. The town center provides great public spaces, and small parks with regenerative landscapes to support the goal of environmental sustainability.

Community
Development

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
CC-P-22 Community Character &
Placemaking
Orient buildings adjacent to public spaces such that entries, windows, and seating areas face the public space.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-23 Community Character &
Placemaking
Where appropriate and feasible, locate and orient active uses (such as commercial uses and parks) along the street edges of new mixed-use development, at street corners, or along main roadways internal to larger developments.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-25 Community Character &
Placemaking
Encourage the design of shared parking for commercial and office uses where possible.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-26 Community Character &
Placemaking
Establish reduced minimum commercial parking requirements for all development within new mixed-use land use designations.

Reduced parking requirements should be supported by proximity to transit, shared parking, and technologies that, once mainstreamed, would reduce the need for conventional parking layouts.

See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Community
Development
Policies – Building Massing and Design
CC-P-30 Community Character &
Placemaking
Ensure that infill residential development is designed to be sensitive to the scale, character, and identity of adjacent existing development.

All new residential development requires review and approval by the Planning Commission through a Development Review application process to assess a project’s compatibility, architectural design, size, scale and massing with the neighborhood. The Planning Commission reviews the design to ensure compliance with the City’s General Plan policies and design guidelines, and ensure sensitive transitions between densities and uses.

On August 5, 2025, the City received an application for the demolition of an existing office building and associated improvements to allow for the development of a for-sale residential community consisting of 49 attached and detached condominium units. The project site is being reviewed to ensure sensitive transitions to adjacent uses, particularly the nearby residential neighborhoods.

Community
Development
CC-P-32 Community Character &
Placemaking
Emphasize human-scaled design within large-scale commercial and mixed-use centers. Employ measures such as articulated massing, awnings, and landscape elements to break down the scale of development.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-33 Community Character &
Placemaking
Encourage new mixed-use and commercial development to
incorporate visual quality and interest in architectural design on all visible sides of buildings through the following approaches:
a) Utilizing varied massing and roof types, floor plans, detailed planting design, or color and materials;
See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
b) Maintaining overall harmony while providing smaller-scale variety; and
c) Articulating building facades with distinctive architectural features like awnings, windows, doors, and other such
elements.

CC-P-34 Community Character &
Placemaking
Update the City of Diamond Bar Citywide Design Guidelines as needed to reflect the design guidance articulated in the General Plan.

See Land Use Chapter Goal LU-G-3.

Community
Development

TOWN CENTER MIXED USE FOCUS AREA
Goals
CC-G-11 Community Character &
Placemaking
Support an intense mix of active uses on both sides of Diamond Bar Boulevard within the Town Center focus area. See Land Use Chapter Goal LU-G-4 and Policy LU-P-21.

Community
Development
CC-G-12 Community Character &
Placemaking
Establish an inviting and comfortable public realm that encourages pedestrian activity in the Town Center focus area.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-G-13 Community Character &
Placemaking
Establish a new pedestrian-oriented “Main Street” within the Town Center focus area lined with retail uses.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
Policies
CC-P-41 Community Character &
Placemaking
Through development review, ensure that the Town Center remains predominantly a community shopping, dining, and entertainment destination, and that residential uses and offices are located so as not to detract from this image.

See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Community
Development
CC-P-42 Community Character &
Placemaking
Prioritize retail and other uses that promote pedestrian activity on the ground floor of buildings.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-43 Community Character &
Placemaking
Establish gateways to the Town Center area at the intersections of Diamond Bar Boulevard and Golden Springs Drive and at Diamond Bar Boulevard and Palomino Drive. Gateway elements should be consistent with the gateway design palette.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-44 Community Character &
Placemaking
As the Town Center redevelops, enhance pedestrian connectivity throughout the district through the incorporation of a new “Main Street” within the western portion of the focus area that is off of or set back from Diamond Bar Boulevard.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-45 Community Character &
Placemaking
The design of new development should be pedestrian-oriented, with the majority of building frontages located at the new street edge and with entrances located along the roadway or along pedestrian pathways or public spaces.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
CC-P-46 Community Character &
Placemaking
Ensure that new buildings employ horizontal and vertical building articulation and diversity in color, materials, scale, texture, and building volumes.

See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Community
Development
CC-P-47 Community Character &
Placemaking
Develop specific building height and other development standards through implementation mechanisms such as the City’s Zoning Ordinance or a master or specific planning process.

See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Community
Development
CC-P-48 Community Character &
Placemaking
Encourage dining establishments to incorporate outdoor dining or sidewalk cafés. See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Community
Development
CC-P-49 Community Character &
Placemaking
Encourage reductions in surface parking and allow for the development of consolidated parking structures, provided that they are screened from view from Diamond Bar Boulevard and Golden Springs Drive.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-50 Community Character &
Placemaking
Where possible, above-grade parking structures should be wrapped with pedestrian uses where they front onto active streets.

If active uses are not feasible, frontages should be architecturally attractive. This may include unique designs and materials such as glass, articulated masonry, murals, or landscaping setbacks.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CC-P-51 Community Character &
Placemaking
Enhance the pedestrian experience along Diamond Bar Boulevard within the Town Center area with widened sidewalks, shade trees, and pedestrian amenities such as street furniture, attractive paving, pedestrian-scaled lighting, and landscape buffers.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development

3. Circulation
POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT

CIRCULATION
This Chapter is aimed at improving the transportation network within the City, balancing the circulation needs with safety and access across a variety of modes of transportation, including automobile travel, public transit, non-motorized transportation and goods movement through a Complete Streets approach.

TRANSPORTATION NETWORK AND STREET DESIGN
Goals
CR-G-1 Circulation
Improve the operating efficiency of the transportation system by reducing vehicle travel demand and providing opportunities for other modes of travel. Before approving roadway improvements that focus on increasing vehicle capacity, consider alternatives that reduce vehicle volumes and prioritize projects that would reduce single-occupancy vehicle use and greenhouse gas emissions.

Transportation Study Guidelines
The City’s Transportation Study Guidelines are implemented in the review of the new development projects for, among other things, the mitigation and reduction of the level of Vehicle Mile Traveled (VMT) of the projects. Additionally, the City updated the Transportation Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
Study Guidelines per the new requirements and clarifications from the State and the new (2020) model data from SCAG.

CR-G-2 Circulation
Maintain a street classification system that considers the broad role of streets as corridors for movement but also reflects a Complete Streets concept that enables safe, comfortable, and attractive access for pedestrians, bicyclists, motorists, and transit users of all ages and abilities, in a form that is compatible with and complementary to adjacent land uses, including neighborhood schools.

See Community Character & Placemaking Chapter Goal CC-G-5 for update on the Diamond Bar Boulevard Complete Streets Project.

Public Works
CR-G-3 Circulation
Strive to achieve a finer grained network of streets and pedestrian/bicycle connections as development occurs, especially in focus areas such as the Transit-Oriented, Neighborhood, Town Center, and Community Core mixed-use areas.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CR-G-4 Circulation
Design roadways serving pedestrian-oriented mixed-use areas to promote neighborhood interaction, pedestrian comfort and walkability, and commercial patronage.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
CR-G-5 Circulation
Develop neighborhood streets and alleys that encourage walking, biking, and outdoor activity through engineering and urban design principles that reduce the potential for speeding and cut-through traffic, which may include traffic calming measures.

See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.Community Development
Policies
CR-P-1 Circulation
When redesigning streets, plan for the needs of different modes by incorporating elements such as shade for pedestrians, safe pedestrian-friendly crossings/ intersections, lighting at the pedestrian scale, bike lanes, signage visible to relevant modes, transit amenities, etc.

See Community Character & Placemaking Chapter Goal CC-G-5 for update on the Diamond Bar Boulevard Complete Streets Project.

Public Works
CR-P-3 Circulation
Plan for and provide new connections within the Transit-Oriented, Neighborhood, Town Center, and Community Core mixed-use areas to create finer grained, pedestrian-scaled circulation networks that support the development of connected and
accessible neighborhoods. Connections should facilitate the use of alternatives to single-occupancy vehicles, such as walking, bicycling, and transit by improving the safety and accessibility of those modes.

See Community Character & Placemaking Chapter Goal CC-G-5 for update on the Diamond Bar Boulevard Complete Streets Project.

See Circulation Chapter Policy CR-P-1.

Public Works
CR-P-4 Circulation
Develop traffic calming strategies for Diamond Bar Boulevard between Temple Avenue and Golden Springs Drive in order to provide a safe and comfortable pedestrian-friendly environment See Community Character & Placemaking Chapter Goal CC-G-5 for update on the Diamond Bar Boulevard Complete Streets Project.

Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
along and through the Neighborhood Mixed Use and Town Center Mixed Use areas.

CR-P-5 Circulation
Necessary transportation improvements should be in place, or otherwise guaranteed to be installed in a timely manner, before or concurrent with new development. In evaluating whether a transportation improvement is necessary, consider alternatives to the improvement consistent with CR-G-1, and the extent to which the improvement will offset the traffic impacts generated by proposed and expected development.

See Circulation Chapter Goal CR-G-1. Public Works

VEHICLE CIRCULATION
Goals
CR-G-7 Circulation
Ensure smooth traffic flows by maintaining or improving traffic levels of service (LOS) that balance operational efficiency, technological and economic feasibility, and safety.

See Circulation Chapter Goal CR-G-1. Public Works
CR-G-8 Circulation Encourage reduction in vehicle miles traveled (VMT) as part of a strategy to reduce greenhouse gas (GHG) emissions. See Circulation Chapter Goal CR-G-1. Public Works CR-G-10 Circulation Discourage traffic from SR-57 and SR-60 from using Diamond Bar roadways as alternatives to the freeway.

See Land Use & Economic Development Chapter Policy LU-P-14 for update on the SR57/60 Confluence Project.

Public Works
Policies – Level of Service (LOS) Standards
CR-P-12 Circulation
Balance meeting LOS standards with the need to reduce VMT through maintaining and supporting multi-modal connectivity such as transit, bicycling, walking, and by encouraging infill development with a pedestrian-friendly urban design character.

See Circulation Chapter Goal CR-G-1. Public Works
CR-P-13 Circulation
Maintain a standard of LOS D during peak hour conditions on all streets in the City’s jurisdiction, with exceptions as noted below:
a) Brea Canyon Rd south of Diamond Bar Blvd (LOS F)
b) Brea Canyon Rd north of Diamond Bar Blvd (LOS E)
c) Grand Ave west of Country View Dr (LOS E)
d) Diamond Bar Blvd at SR-60 Eastbound Ramps (LOS F).

See Circulation Chapter Goal CR-G-1. Public Works
CR-P-14 Circulation
Prioritize pedestrian movement and safety— through wider sidewalks, more frequent pedestrian crossings, sidewalk bulbouts, median pedestrian refuges etc.—rather than LOS in Community Character Priority Areas, which are areas designated for higher density mixed-use development in the General Plan.

See Section 4.4 for more detailed policies on bicycle and pedestrian movement in mixed-use areas.

See Community Character & Placemaking Chapter Policy CC-G-5 for the update on the Diamond Bar Boulevard Complete Streets Corridor Project.

See Land Use & Economic Development Chapter Policy LU-P-61 for the update on the Intersection Safety Improvements on Golden Springs Drive at Golden Prados Drive.

Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
CR-P-17 Circulation Maintain roadway design standards to manage vehicle speeds and traffic volumes, updating them as needed.

See Community Character & Placemaking Chapter Policy CC-G-5 for the update on the Diamond Bar Boulevard Complete Streets Corridor Project.

Public Works
Policies – Adaptive Traffic Control (ATCS) & Intelligent Traffic Systems (ITS) CR-P-20 Circulation
Implement measures such as additional signal timing and synchronization, speed limit regulations, and ITS techniques to increase safety and reduce congestion. Maintain a pavement management system and maintenance program for all public roadways throughout the City.

Triennial Pavement Management Program Update
In February 2025, the City Council awarded a consulting services agreement for the Pavement Management Program (PMP) update.

Each City street is assessed by the consultant and assigned a Pavement Condition Index (PCI) score. The assigned PCI score determines the level of treatment required for pavement maintenance. The City utilizes the completed PMP to plan future residential and arterial pavement rehabilitation projects. The PMP report was finalized in August 2025, and the average Citywide PCI score (for arterial and residential streets) was 78.

See Land Use & Economic Development Chapter Policy LU-P-14.

Public Works
CR-P-21 Circulation
On an ongoing basis, examine opportunities to avoid delay, spillover, or cut-through traffic onto Diamond Bar’s roadways through techniques such as adaptive traffic control systems along major corridors and traffic calming measures along cut-through routes that would reduce speeds and discourage drivers from electing to drive on them. Consider financial and technological feasibility and community priorities to determine whether and how strategies should be implemented.

See Land Use & Economic Development Chapter Policy LU-P-14 and Circulation Chapter Policy CR-P-20.

Public Works
Policies – Safety
CR-P-22 Circulation
Implement traffic calming measures to slow traffic on local and collector residential streets and prioritize these measures over congestion management where appropriate and feasible.

See Community Character & Placemaking Chapter Policy CC-P-11. Public Works CR-P-23 Circulation
Maintain the integrity of existing residential areas and discourage cut-through traffic by retaining cul-de-sacs and implementing other traffic calming measures that promote safe driving at speeds appropriate to the surrounding neighborhood, particularly at Prospectors Road, Chaparral Drive, Sunset Crossing Road, Lycoming Street, and Washington Street.

See Community Character & Placemaking Chapter Policy CC-P-11. Public Works Policies – Inter-Jurisdictional Coordination
CR-P-26 Circulation As opportunities arise, coordinate with other jurisdictions, including neighboring cities, Los Angeles County, San Bernardino County, See Circulation Chapter Policy CR-P-2. Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
and Caltrans, on improvements to street segments common to the City of Diamond Bar and other jurisdictions.

CR-P-27 Circulation
Encourage improvements to regional routes and arterial streets to account for environmental, aesthetic, and noise concerns, as well as to provide adequate buffers to adjacent land uses.

See Community Character & Placemaking Chapter Policy CC-P-1. Public Works CR-P-29 Circulation Solicit State and Federal funds to improve area freeways and local streets. See Community Character & Placemaking Chapter Goal CC-G-5. Public Works

PEDESTRIAN AND BICYCLE CIRCULATION
Goals
CR-G-11 Circulation Expand and strengthen existing pedestrian and cyclist network and facilities. See Community Character & Placemaking Chapter Goal CC-G-5. Public Works CR-G-12 Circulation Improve safety and accessibility for pedestrians and cyclists. See Community Character & Placemaking Chapter Goal CC-G-5. Public Works Policies – Bicycle & Pedestrian Movement in Mixed Use Areas CR-P-39 Circulation
Ensure a safe environment for pedestrians and cyclists while allowing for local traffic to access freeways in the Neighborhood Mixed Use area through the following strategies:
a) Widening sidewalks, providing planting strips between sidewalks and streets and providing pedestrian amenities such as shade trees and street furniture along Diamond Bar Boulevard;
b) Implementing traffic calming measures such as reduced vehicle speeds, striping and signage along Diamond Bar
Boulevard;
c) Buffering bike lanes along Diamond Bar Boulevard;
d) Enhancing pedestrian crossings at the intersection of Diamond Bar Boulevard and Sunset Crossing Road, at
Diamond Bar Boulevard and Highland Valley Road, and at
Diamond Bar Boulevard and the SR-60 on/off ramps; and
e) Incorporating multi-use pathways internal to new
development and connecting to existing development.

See Community Character & Placemaking Chapter Goal CC-G-5. All of these elements and considerations are being incorporated into the design of the Diamond Bar Boulevard Complete Street Project and the future TCSP. After completion, this project will be referenced as the Complete Streets template for the remainder of the City.

Public Works
CR-P-40 Circulation
Provide for a vibrant Town Center that encourages pedestrian activity and comfort within the Town Center Mixed Use area while accommodating through traffic along Diamond Bar Boulevard through the following strategies:
a) Establishing a new pedestrian-oriented main street or pedestrian pathway in the Town Center;
b) Enhancing the pedestrian experience along Diamond Bar Boulevard within the Town Center area with widened
See Land Use Chapter Goal LU-G-4 and Policies LU-P-7 and CCP-21.

See Circulation Chapter Goal CR-P-39.

Community
Development
Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
sidewalks, shade trees, and pedestrian amenities such as street furniture, attractive paving, pedestrian-scaled lighting, and landscape buffers;
c) Buffering bike lanes along Diamond Bar Boulevard;
d) Improving crosswalks at the intersection of Diamond Bar Boulevard and Palomino Drive, at Diamond Bar Boulevard
and Golden Springs Drive, and where Diamond Bar
Boulevard intersects with the driveway to the Town Center; and
e) Strengthening cyclist and pedestrian connections between the Town Center area and nearby schools to provide safe and convenient routes to the Town Center for students by identifying barriers such as safety hazards and gaps in the bicycle and pedestrian networks and implementing
improvements to address those barriers.

Policies – Safety
CR-P-44 Circulation
Enhance bicycle and pedestrian safety and comfort where feasible through means such as:
a) Introducing bicycle- and pedestrian-level street lighting to improve safety at night;
b) Furnishing intersections with crosswalks on all legs of the intersection;
c) Improving pedestrian safety with intersection design features such as improved signal timing, sidewalk bulbouts, pedestrian refuge islands with “noses” that extend past the crosswalks, advance vehicle stop bars, high visibility
crosswalk striping or decorative paving;
d) Improving bicycle safety with intersection design features such as bicycle detection and signalization, painted bike boxes, and intersection crossing markings;
e) Widening sidewalks, providing planting strips between sidewalks and streets and providing pedestrian amenities such as shade trees and street furniture; and
f) Implementing traffic calming measures to reduce vehicle speeds and congestion.

See Community Character & Placemaking Chapter Goal CC-G-5. All of these elements and considerations are being incorporated into the design of the Diamond Bar Boulevard Complete Street Project and the future TCSP. After completion, this project will be referenced as the Complete Streets template for the remainder of the City.

Public Works
CR-P-45 Circulation
Routinely review pedestrian and cyclist collision data for type, location, severity, and cause, and develop strategies to prevent these collisions.

The City always reviews collision data to develop prevention strategies. This process occurs after the Los Angeles County Sheriff’s Department concludes its investigation of the collision and provides the accident report with findings.

Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT

PUBLIC TRANSPORTATION
Goals
CR-G-13 Circulation Support the availability, efficiency, and effectiveness of public transit service. See Circulation Chapter Policy CR-P-1 Public Works Policies
CR-P-48 Circulation
As opportunities arise, work with Foothill Transit to maintain and improve bus stops and shelters, as well as identify areas where service can be improved or expanded to increase system use.

The City maintains and improves bus stops and shelters as necessary, and coordinates with Foothill Transit to identify areas where service can be improved or expanded to increase system use.

Public Works

PARKING
Goals
CR-G-14 Circulation
Provide adequate parking for all land use types, while balancing this against the need to promote walkable, mixed-use districts and neighborhoods in targeted areas, and promoting ride-sharing and alternative transportation modes.

See Land Use Chapter Goal LU-G-4.

Community
Development
Policies
CR-P-53 Circulation
Update parking standards in the Development Code to ensure that they are reflective of the community’s needs, using current data on parking demand and taking into consideration demographics and access to alternative modes of transportation.

The City is currently implementing during project reviews. Public Works CR-P-54 Circulation Incorporate criteria in the Development Code to allow reductions in parking requirements in exchange for VMT reduction measures. The City is currently implementing during project reviews. Public Works Policies – Truck Routes
CR-P-64 Circulation
Continue prohibiting trucks heavier than 5 tons from operating on designated residential streets, except for emergency, maintenance, residential moving trucks, and transit vehicles, to maintain pavement integrity.

The City currently implements this restriction. Public Works CR-P-65 Circulation
Periodically review collision data for type, location, severity, and cause. Develop countermeasures for sites with recurrent truckinvolved collisions.

The City reviews collision data to develop prevention strategies. This process occurs after the Los Angeles County Sheriff’s Department concludes its investigation of the collision and provides the accident report with findings.

Public Works

4. Resource Conservation
POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT

RESOURCE CONSERVATION
A conservation element is required to provide guidance for the conservation, development, and utilization of natural resources, including water quality and hydraulic force, forests, soils, rivers and other waters, harbors, fisheries, wildlife, minerals, and others as applicable to each jurisdiction. An open space element is intended to ensure that cities and counties recognize that open space land is a limited and valuable resource, and that they prepare and carry out open space plans to guide the comprehensive long-range preservation and conservation of open space land. The Resource Conservation Chapter provides policies to guide the City’s stewardship of its resources, ensuring the conservation and enhancement of open spaces, biological resources, water and air quality, and cultural resources.

OPEN SPACE
Goals
RC-G-3 Resource Conservation
Preserve to the extent possible open space ridgelines, hilltops, and prominent slopes for aesthetic, biological and natural resource conservation, and safety purposes.

The Canyon Loop Trail project included many improvements to the existing trail and triggered habitat monitoring to comply with all state and federal requirements for the protection, replacement and restoration of native habitat affected by the project. The City contracted with Michael Baker International and Helix Environmental to implement the five-year Habitat Mitigation Monitoring Program to implement mitigation measures supporting the natural habitat found around the Canyon Loop Trail. Currently, three unique areas on the trail are being restored and enhanced to meet the existing conditions.

Parks & Recreation
Policies
RC-P-7 Resource Conservation
Minimize visual and environmental impacts to ridgelines, hilltops, and slopes through regulations that minimize grading, ensure that development conforms to natural topography, and maximize safety, correlating development intensity with the steepness of terrain.

Landform grading criteria and maximum allowable densities shall be based upon the slope density formula as set forth in the Development Code.

The Planning Division reviews each project to ensure compliance with the City’s General Plan policies and City’s Hillside Management Design Guidelines. The guidelines were created to ensure that development will complement the character and topography of hillside areas set forth in the Development Code.

Community
Development
RC-P-8 Resource Conservation
To the extent feasible, support and cooperate with the efforts of other jurisdictions and conservation organizations to protect prominent ridges, slopes, and hilltops in and adjacent to the City and its Sphere of Influence.

Such features include, but are not limited to, areas identified by Los Angeles County as Significant Ecological Areas;
Tonner Canyon; the hills within Tres Hermanos Ranch; and the hillsides along SR-57, between Diamond Bar and Brea.

In coordination with the cities of Chino Hills and Industry, a one day guided tour of the Tres Hermanos property was provided free of charge for approximately 100 members of the public on September 27, 2025. The guided tours included exhibits and historical presentations led by local historians, current City Managers and staff.

Parks & Recreation

BIOLOGICAL RESOURCES
Goals
RC-G-6 Resource Conservation
Utilize native and drought-tolerant vegetation in landscaping, site stabilization and restoration where practical to prevent the spread of invasive plant species into natural open spaces.

During project review, the Planning Division ensures that the plant palette is diverse, Southern California native and drought-tolerant vegetation is utilized, and that the planting and irrigation plans comply with the City’s Water Efficient Landscaping Ordinance.

Community
Development
Policies
RC-P-9 Resource Conservation
Require, as part of the environmental review process prior to approval of discretionary development projects involving parcels within, adjacent to, or surrounding a significant biological resource area, a biotic resources evaluation of the site by a qualified biologist.

Focused plant surveys shall be conducted at the appropriate time of year, and local reference populations checked to ensure detectability of the target species. Wildlife shall also be evaluated by a qualified biologist through appropriate survey or trapping techniques necessary to determine presence. Such evaluation shall analyze the existing and potential natural resources of a given site as well as the potential for significant adverse impacts on biological resources. The report shall identify measures to avoid, minimize, or mitigate any impacts to species that have been observed or have the potential of being present on the site. In approving any permit based on the evaluation, the City shall require implementation of mitigation measures supported by the evaluation, or work with the applicant to modify the project if mitigation is determined not to be adequate to reduce the impacts to a non-significant level.

In compliance with the Mitigation Monitoring and Reporting Program (MMRP) for the Canyon Loop Trail project, focused plant and nesting bird surveys were conducted prior to any habitat restoration work during the breeding seasons of the California Gnatcatcher and Cactus Wren.

Parks & Recreation
RC-P-10 Resource Conservation
Require, to the greatest extent feasible, new development to preserve mature native trees including oak and walnut, and trees of significant cultural or historical value such as sycamore and arroyo willow, etc., as set forth under the Diamond Bar Tree Preservation and Protection Ordinance. Review the ordinance periodically and update it as necessary to reflect current best practices.

The Planning Division reviews each project to evaluate if a protected tree can be preserved or retained on-site. If preservation is not feasible, trees are required to be replanted at a minimum 3:1 ratio pursuant to the City’s Tree Preservation and Protection Ordinance.

Community
Development

WATER RESOURCES
Goals
RC-G-7 Resource Conservation
Protect waterways—including creeks, riverines, artesian springs, seeps, and wetlands—and watersheds in Diamond Bar from
pollution and degradation as a result of urban activities.

See Land Use & Economic Development Chapter Policy LU-P-5. Public Works

Policies – Water Conservation
RC-P-17 Resource Conservation Continually evaluate and upgrade the efficiency of City irrigation systems, prioritizing the use of reclaimed water.

The City continues to evaluate and upgrade the efficiency of City irrigation systems and prioritize the use of reclaimed water, wherever possible and feasible.

Public Works
RC-P-19 Resource Conservation Encourage the implementation of the latest water conservation technologies into new developments.

Building and Safety requires water conservation fixtures as required by the California Green Building Code (CALGreen) and the California Plumbing Code.

Community
Development
Policies – Water Quality
RC-P-23 Resource Conservation
Ensure that post-development peak stormwater runoff discharge rates do not exceed the estimated predevelopment rate and that dry weather runoff from new development not exceed the predevelopment baseline flow rate to receiving water bodies.

The City implements this engineering standard on all development projects by reviewing the stormwater quality and quantity (hydraulic and hydrology study) impacts and requiring construction and maintenance of low impact development (LID) best management practices (BMPs).

Public Works

AIR QUALITY
Goals
RC-G-14 Resource Conservation
Aim for a diverse and efficiently-operated local and regional ground transportation system that reduces VMT and generates the minimum amount of pollutants feasible.

See Circulation Chapter Goal CR-G-1 for VMT Guidelines and implementation efforts.

Public Works
Policies
RC-P-24 Resource Conservation
Encourage new development to minimize impacts on air quality through the following measures: a. Use of building materials and methods that minimize air pollution. b. Use of fuel-efficient heating equipment, and other appliances, such as water heaters, swimming pool heaters, cooking equipment, refrigerators, furnaces, boiler units, and low or zero-emitting architectural coatings. c. Use of clean air technology beyond what is required by South Coast Air Quality Management District (SCAQMD), leveraging State and local funding sources.
• Building & Safety implements CALGreen. Whenever a
building permit is issued for construction, CALGreen requires the building inspector to verify the reduction of dust and volatile organic compounds (VOCs). Dust control measures include watering of dirt on projects that are moving earthwork and VOCs are limited in quantity by requiring materials with certified lower VOCs be used.
• Through the implementation of the California Energy Code and CALGreen, more efficient equipment and reduced VOC’s are required respectively. The CA Energy Code requires
highly efficient heating and cooling systems through requiring high seasonal energy efficiency ratings and energy efficient materials such as low-E (low emissivity) windows. The CA Energy Code also requires high efficacy lighting, energy efficient switching and sensors, certified cooktop hoods, rooftop solar installations in new construction, and mostly instantaneous water heaters for new construction. CALGreen requires low emitting architectural coatings through limiting the VOC’s and requiring certified listed low-emitting products including paints and sealants.

Community
Development

• CALGreen requires clean air within buildings including through requiring higher minimum efficiency reporting value (MERV) filters and minimum outdoor air circulation. Higher filtration removes contaminants and outdoor air circulation reduces carbon dioxide levels within structures
RC-P-25 Resource Conservation
Conserve natural open spaces, biological resources, and vegetation, recognizing the role of these resources in the reduction and mitigation of air pollution impacts, and the promotion of CO2 sequestration.

Building & Safety follows various SCAQMD rules including requiring SCAQMD proof of notification before some projects are demolished, preventing wood burning fireplaces from being installed, prevention of excessive dust on construction sites, and requiring SCAQMD notification prior to the issuance of permits for char-broilers.

Community
Development
RC-P-28 Resource Conservation
Cooperate with the ongoing efforts of the U.S. Environmental Protection Agency (EPA), SCAQMD, the Southern California Association of Governments (SCAG), and the State of California Air Resources Board in improving air quality in the regional air basin.

Building & Safety Department requires all construction projects to provide proper mechanical ventilation systems pursuant to the California Mechanical Code. The California Building Code limits the amount of hazardous materials on a site which could lead to further Toxic Air Contaminants. During construction, dust mitigation and erosion control are required and enforced by the building inspector on any construction project. The remainder of this work is conducted through the Public Works Department.

Community
Development
RC-P-30 Resource Conservation
For new or modified land uses that have the potential to emit dust, odors, or TACs that would impact sensitive receptors, require the business owners to obtain all necessary SCAQMD clearances or permits prior to business license or building permit issuance.

Sensitive receptors include residences, schools, childcare centers, playgrounds, parks and other recreational facilities, nursing homes, hospitals, and other medical care facilities.

The Public Works Department requires an erosion control plan to be provided prior to permit issuance, including sandbags around the property and intermittent watering of a grading site. Prior to any demolition, the Building & Safety Division requires that SCAQMD to be notified before permits are issued.

Community
Development
Public Works
RC-P-33 Resource Conservation
Require construction and grading plans to include State and AQMD-mandated measures to the maximum extent possible
fugitive dust and pollutants generated by construction activities and those related to vehicle and equipment cleaning, fueling and maintenance as well as mono-nitrogen oxides (NOx) emissions from vehicle and equipment operations.

Public Works implements all dust control measures during grading with assistance from Building & Safety during construction.

Community
Development
Public Works
RC-P-39 Resource Conservation Reduce paved road dust emissions through targeted street sweeping of roads subject to high traffic levels and silt loadings.

The City continuously monitors and adjusts the frequency of the street sweeping service depending on the season.

Public Works
RC-P-40 Resource Conservation
Continue to advocate at all levels of government for improvements to the confluence of the SR-57 and SR-60 freeways, including the construction of the missing interchanges between the two freeways, to reduce congestion and delays on the freeways, as well as affected surface streets and on/offramps.

See Land Use & Economic Development Chapter Policy LU-P-14 for update on the SR57/60 Confluence Project.

The City continues to advocate for additional improvements to the SR-57 and SR-60 freeways, including the missing interchanges from the westbound SR-60 to northbound SR-57 and southbound SR-57 to eastbound SR-60.

Public Works

CULTURAL AND HISTORIC RESOURCES
Policies – Tribal Cultural Resources
RC-P-46 Resource Conservation
Conduct project-specific Native American consultation early in the development review process to ensure adequate data recovery and mitigation for adverse impacts to significant Native American sites.

Ensure that City staff and local developers are aware of their responsibilities to facilitate Native American consultation under Senate Bill 18 and Assembly Bill 52.

For projects subject to AB 52, which includes the Walnut Valley Unified School District digital billboard project, the City implements resource conservation policies that require consultation with California Native American tribes regarding potential impacts to Tribal Cultural Resources. The project applicants have formally entered into and commenced consultation with the Kizh Nation, and consultation has resulted in agreed-upon mitigation measures to protect tribal cultural resources, including the presence of a qualified tribal monitor during all ground-disturbing activities. Following project approval, the applicants and the Kizh Nation will enter into a monitoring agreement, and a copy of the fully executed agreement will be provided to the City prior to issuance of any construction permits, which is anticipated to begin construction in early 2026.

Community
Development

5. Public Facilities and Services
POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT

PUBLIC FACILITIES & SERVICES
This Chapter sets forth the policy framework for the City to manage infrastructure and services, identify areas for improvement, and ensure that public utilities, services, and programs can meet the needs of the community into the future.

PARKS & RECREATION
Goals
PF-G-3 Public Facilities &
Services
Ensure that new development bears the costs of new parks and recreation facilities that are needed to meet any increase in demand resulting from the new development, or from which the new development would benefit.

As a condition of tentative map approval, the applicant is required to dedicate land and/or pay a fee in compliance with DBCC Section

21.32.040 for the purpose of developing new or rehabilitating existing park or recreation facilities to serve the subdivision.

Community
Development
Policies – General
PF-P-6 Public Facilities &
Services
Monitor and seek to actively engage in Cal Poly Pomona’s plans for the redevelopment of the former Lanterman site, and seek joint use opportunities for parks and recreation facilities developed on the site.

City staff continue to utilize the revised Joint Use Agreement with Walnut Valley Unified School District for indoor athletic space for community programming.

Parks & Recreation
Policies – Parks & Recreation Facilities
PF-P-8 Public Facilities &
Services
Develop and maintain a parkland dedication requirement/in-lieu fee consistent with the General Plan standard of five acres per 1,000 residents in Diamond Bar.

See Public Facilities and Services Chapter Goal PF-G-3.

Community
Development

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
PF-P-9 Public Facilities &
Services
Prioritize public parkland dedication as a condition of new residential development, allowing the use of in lieu fees only where parkland dedication is not feasible, to ensure a public park system available to the entire community.

See Public Facilities and Services Chapter Goal PF-G-3.

Community
Development
PF-P-16 Public Facilities &
Services
Continue to provide programming and services for seniors, including active programs, classes, and activities and outings, adjusting programming based on needs and preferences,
particularly as Diamond Bar’s residents age.

On November 12, 2025, the City hosted a Senior Health Day which provided aging resources, health checks, and free information to approximately 250 local seniors at the Diamond Bar Center Parks & Recreation
PF-P-17 Public Facilities &
Services
Address the recreational needs of all children and adults, including persons with disabilities, seniors, and dependent adults, be addressed in recreational facility planning efforts.

On January 21, 2025, the 10.23-acre property located at 22601 Sunset Crossing Road was transferred to the City at no cost by a Transfer Agreement Facilities Use Agreement. This property combined with the adjacent City-owned 2.78-acre site will create a 13-acre park site that has the potential to be developed into a community park with amenities for residents of all ages, interests and activity levels.

Parks & Recreation

SCHOOLS AND COMMUNITY FACILITIES
Goals
PF-G-4 Public Facilities &
Services
Continue to provide residents of all ages to high quality local educational facilities and learning opportunities in cooperation with the Walnut Valley and Pomona Unified School Districts (WVUSD and PUSD, respectively), the Los Angeles County library system, and community organizations.

The Walnut Valley Unified School District’s digital billboard will be located on an existing, developed Walnut Valley Unified School District property, and avoids the displacement of existing land uses or the need for new infrastructure and supports the continued efficient use of an established institutional site. The project establishes a cooperative public–public partnership between the City and the School District by generating ongoing lease revenue for WVUSD to help support educational programs and facility improvements, while also providing a community benefit to the City through dedicated on-screen time for public service announcements.

This allocation would allow the City to disseminate important community information and emergency notifications at no cost, strengthening interagency collaboration and enhancing public communication. The City Council approved the project on December 16, 2025.

Community
Development
Policies – Schools
PF-P-28 Public Facilities &
Services
Continue sponsoring and promoting events and cultural activities that bring the community together in different locations throughout the city.

City staff continues to organize and update City-wide special events such as the Windmill Lighting, Veterans Day, Corporate Showcase, and Wedding & Event Expo in order to promote community
enrichment and the business community.

Parks & Recreation

UTILITIES

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
Goals
PF-G-6 Public Facilities &
Services
Ensure that public facilities and services, including water, wastewater, sewage, electricity, natural gas, and solid waste, are provided in a safe, efficient, and timely manner to meet the current and future needs of the city.

Will serve letters from outside agencies are required for building permit issuance to show that adequate facilities are or will be available to serve a proposed Accessory Dwelling Unit or subdivision.

See Land Use & Economic Development Chapter Policy LU-P-5 for the update on the Rule 20A Utility Undergrounding Project.

Community
Development
Policies – Water & Wastewater
PF-P-37 Public Facilities &
Services
As opportunities arise, work with the Los Angeles County Public Works Department (LACPWD) and Los Angeles County Sanitation District (LACSD) to ensure that wastewater treatment conveyance systems and treatment facility capacity is available to serve planned development within Diamond Bar.

Will serve letters from the LACSD are required for building permit issuance to show that adequate sewer facilities are or will be available to serve a proposed Accessory Dwelling Unit or subdivision.

Community
Development

6. Public Safety
POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT

PUBLIC SAFETY
The purpose of this Chapter is to identify the natural and man-made public health and safety hazards that exist within the City, and to establish preventative and responsive policies and programs to mitigate their potential impacts, particularly in light of our unique environmental, seismic, and topographic conditions. This Chapter also addresses the excellent public safety services provided by the L.A. County Sheriff’s and Fire Departments, and endorses the continuation of the contract model of government for the continuation of these services. Lastly, the Public Safety Chapter addresses noise and serves to limit the exposure of the community to excessive noise levels. The Goals and Policies emphasize partnerships with local, regional and State agencies to ensure the City’s readiness for public safety threats through action plans and educational efforts.

SEISMIC AND GEOLOGIC HAZARDS
Goals
PS-G-1 Public Safety
Partner with the Los Angeles County Fire and Sheriff’s Departments in community education efforts aimed at preventing potential loss of life, physical injury, property damage, public health hazards, and nuisances from seismic ground shaking and other geologic hazards such as landslides and mudslides.

In 2025, the City partnered with public safety partners, including Los Angeles county Sheriff’s Department, Los Angeles county Fire Department, and Inland Valley humane Society to present five public town-hall style meetings. Topics included an overview of the City’s public safety programs and budget, crime prevention, wildfire prevention, emergency preparedness, and animal care and control.

Each meeting also included opportunities to meet public safety officials, ask questions, and receive valuable informational resources.

Community Relations
Division
Policies

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
PS-P-2 Public Safety
Require areas identified as having significant liquefaction potential (including secondary seismic hazards such as differential compaction, lateral spreading, settlement, rock fall, and landslide) to undergo site-specific geotechnical investigation prior to development and to mitigate the potential hazard to a level of insignificance or, if mitigation is not possible, to preserve these areas as open space or agriculture.

Figure 7-3 (Page 7-8 of the Public Safety Element) shows areas where historical occurrence of liquefaction, or local geological, geotechnical, and groundwater conditions
indicate a potential for permanent ground displacements.

The City implements this engineering standard on all grading projects by requiring a site-specific geotechnical investigation to identify any hazards and to develop proper hazard mitigation as appropriate.

Public Works
PS-P-4 Public Safety
Carry out a review of City-owned critical facilities that may be vulnerable to major earthquakes and landslides and develop programs to upgrade them.

The City regularly inspects and evaluates its facilities and infrastructure.

In 2025, the City consulted with a civil engineering firm to design roadway stabilization plans for a damaged section of Diamond Bar Boulevard, between Cold Spring Lane and Crooked Creek Drive.

The plans will be finalized in 2026, and the conditions will be continuously monitored until construction funding is secured.

Public Works

FLOOD HAZARDS AND PROTECTION
Goals
PS-G-2 Public Safety
Implement measures aimed at preventing the potential for loss of life, physical injury, property damage, public health hazards, and nuisances from the effects of a 100- year storm and associated flooding.

The City prepared a comprehensive update to the City’s Hazard Mitigation Plan (Plan) with the assistance of a Federal Emergency Management Agency (FEMA) grant, which was adopted by the City Council and approved by FEMA July 19, 2022. The Plan Update includes an all-hazards summary of potential risks to the City from earthquakes, fires, floods, severe storms, and other natural disasters. In 2025, City staff submitted a grant request to FEMA/CalOES to fund the development of the next five-year update, with an expected completion date of 2027-2028. The Plan, in concert with the City’s Emergency Operations Plan (EOP), can eventually be used to support resilient planning, mitigation, reconstruction strategies, and response efforts to climate conditions and incidents impacting the community. The Plan review process included a public comment period, including initial submission and review by FEMA. Very High Severity Fire Zones have been mapped throughout the City hillside areas requiring new construction to be fire-resistant at exterior surfaces exposed to wildland areas.

Public Works

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
Also applies to Public Safety Chapter goals PS-G-3 and PS-G-8 and policies PS-P-7, PS-P-38, PS-P-39, and PS-P-44

Policies
PS-P-7 Public Safety
Work with the Federal Emergency Management Agency (FEMA) as needed to ensure that the City’s floodplain information is up to date with the latest available hydrologic and hydraulic engineering data.

See Public Safety Chapter goal PS-G-2 Public Works
PS-P-8 Public Safety
Continue to implement flood control programs, such as the City’s Grading and Floodplain Ordinances, that reduce flood hazards to comply with State flood risk management requirements.

The City routinely implements flood control programs that reduce hazards to comply with State requirements.

Public Works
PS-P-9 Public Safety
Consider the impacts to health and safety from potential flooding on future development in flood-prone areas, including those identified as being within the 100- or 500-year floodplains. Require installation of protective structures or other design measures to protect proposed building and development sites from the effects of flooding in these areas.

Figure 7-4 (Page 7-12 of the Public Safety Element) shows flood zones in and around the Planning Area based on
FEMA’s 2016 flood hazard data.

The City considers the impacts of potential flooding on future development in flood-prone areas and requires mitigation measures, as appropriate.

Public Works
PS-P-12 Public Safety
As part of the Capital Improvement Program, consider and incorporate flood control improvements identified in the drainage master plan that specifies funding and timing of prioritized improvements. Coordinate the City’s Capital Improvement Program with planned County improvements.

See Land Use & Economic Development Chapter Policy LU-P-5 for information about the flood control and drainage improvement projects constructed in 2025.

Public Works
PS-P-13 Public Safety
As resources become available, reduce the flooding impact of a storm event by enhancing the city’s green infrastructure system to complement the gray infrastructure system where feasible.

See Community Character & Placemaking Chapter Goal CC-G-5 for information about the green street component included in the scope of the Diamond Bar Boulevard Complete Streets Project.

Public Works

FIRE HAZARDS
Goals
PS-G-3 Public Safety
Partner with the Los Angeles County Fire Department and affiliated agencies to implement hazard mitigation plans and community education efforts aimed at preventing the potential for loss of life, physical injury, property damage, public health hazards, and nuisances from wildland and urban fires.

See Public Safety Chapter goal PS-G-2 City Manager’s Office Policies – General
PS-P-14 Public Safety
Educate the public about fire hazards and fire prevention. Work with the County of Los Angeles Fire Department and CAL FIRE to disseminate information on fire weather watches and fire risks and encourage all Diamond Bar residents to engage in risk reduction and fire preparedness activities.

The City continues to expand upon public education and outreach efforts to educate residents with a comprehensive approach to fire and weather-related hazards, through a variety of platforms such as City’s website, monthly DBConnection newsletter, public presentations, emergency alert system, and informational videos.

The information, in collaboration with City and Public Safety partners with Los Angeles County Sheriff and Fire Departments, is aimed at City Manager’s Office

The Los Angeles County Fire Department maintains
information on family fire preparedness plans and risk
reduction measures such as vegetation management.
improving public safety preparedness efforts, increase resident awareness, and ensure compliance with State and County Public Health Orders. The Los Angeles County Fire Department also has an active fire brush clearance program that incorporates inspections from local fire stations in areas of know fire danger to ensure that residents are aware of mitigation measures they can implement on their property.

The City, in collaboration with Los Angeles County Office of Emergency Management (OEM), County of Los Angeles Fire
Department, and Los Angeles County Sheriff’s Department, finalized and implemented the Genasys Project in 2024 – where the City of Diamond Bar and cities throughout the County have pre-designated fire evacuation zones that can be used to communicate to residents in the event of a fire emergency requiring evacuation. The system is complete and the zone information has been used for testing and preparedness efforts during summer 2025 SCE Public Safety Power Shutoff (PSPS) activations.

Also applies to Public Safety Chapter goal PS-G-9 and policies PSP-18 and PS-P-42 See Land Use & Economic Development Chapter Policy LU-P-5 for the update on the Rule 20A Utility Undergrounding Project.

PS-P-15 Public Safety
Ensure adherence to applicable Fire and Building Codes, including standards for minimum road widths, access and clearance for emergency vehicles, and the identification of all roads, streets, and major public buildings in a manner that is clearly visible to fire protection and other emergency vehicles.

Prior to building permit issuance, all residential projects located in the High Fire Hazard Severity Zone are required to submit landscape plans designed to comply with the requirements of the Los Angeles County Fire Department’s Fuel Modification Plan Guidelines in terms of plant selection, placement and maintenance. The final landscape and fuel modification plans are submitted to the Los Angeles Fire Department for review and approval.

Community
Development
PS-P-16 Public Safety
For privately-owned property within areas designated for development that are subject to high wildfire risk, condition approval of development upon the implementation of measures to reduce risks associated with that development, including, but not limited to, fuel modification plans and Fire Code requirements in effect at the time of project approval.

Prior to building permit issuance, all residential projects located in the High Fire Hazard Severity Zone are required to submit landscape plans designed to comply with the requirements of the Los Angeles County Fire Department’s Fuel Modification Plan Guidelines in terms of plant selection, placement and maintenance. The final landscape and fuel modification plans are submitted to the Los Angeles Fire Department for review and approval.

Community
Development
PS-P-18 Public Safety
Work cooperatively with the County of Los Angeles Fire
Department, CAL FIRE, and fire protection agencies of neighboring jurisdictions to address regional wildfire threats.

See Public Safety Chapter policy PS-P-14 City Manager’s Office

Policies – Fire Hazard Severity Zones & State Responsibility Areas PS-P-19 Public Safety
Maintain and update the City’s High Fire Hazard Severity Zones map consistent with changes in designation by CAL FIRE to ensure that the County of Los Angeles Fire Department is protecting the community from wildland-urban fires as future development takes place.

See Public Safety Chapter Policy PS-P-14. City Manager’s Office PS-P-20 Public Safety
Prior to permit approval, ensure that all new development located in a Very High Fire Hazard Severity Zone or a State Responsibility Area (SRA) is served by adequate infrastructure, including safe access for emergency response vehicles, visible street signs, and water supplies for fire suppression.

See Public Safety Chapter Policy PS-P-14.

Community
Development
PS-P-21 Public Safety
Collaborate with the County of Los Angeles Fire Department to ensure that properties in and adjacent to High or Very High Fire Hazard Severity Zones as indicated in Figure 7-6 are adequately protected from wildland fire hazards in a manner that minimizes the destruction of natural vegetation and ecosystems through inspection and enforcement. Update Figure 7-6 as new information becomes available from CAL FIRE.

See Public Safety Chapter Policy PS-P-14.

Community
Development
PS-P-22 Public Safety
Support the County of Los Angeles Fire Department’s Provision of weed abatement and brush thinning and removal services in High and Very High Fire Hazard Severity Areas in order to curb potential fire hazards.

See Public Safety Chapter Policy PS-P-14.

Community
Development
PS-P-23 Public Safety
Where development is proposed within High or Very High Fire Hazard Severity Zones, ensure that the County of Los Angeles Fire Department has the opportunity to review the proposal in terms of its vulnerability to fire hazards and its potential as a source of fire, including fuel modification plan review for new development or additions that are equal or greater than 50 percent of the existing square footage.

Prior to building permit issuance, all residential projects located in the High Fire Hazard Severity Zone are required to submit landscape plans designed to comply with the requirements of the Los Angeles County Fire Department’s Fuel Modification Plan Guidelines in terms of plant selection, placement and maintenance. The final landscape and fuel modification plans are submitted to the Los Angeles Fire Department for review and approval.

Community
Development

HAZARDOUS MATERIALS AND OPERATIONS
Policies
PS-P-25 Public Safety
On sites with known contamination of soil and groundwater, work with State and local agencies to continue to identify and compel cleanup of such sites to ensure that construction workers, future occupants, the public, and the environment are adequately protected from hazards associated with contamination.

The City may reference the State Water Resources Control Board’s Geotracker database and the California Department of Toxic Substances Control’s EnviroStor database to
identify potentially hazardous sites. Figure 7-8 (Page 7-26 of City staff is continuing to monitor the progress of groundwater remediation of the vacant lot at 23671 Golden Springs Drive. The owner is currently working with the California Regional Water Quality Control Board to test and cleanup releases from underground gas storage tanks where the former Chevron gas station previously occupied the site.

Community
Development

the Public Safety Element) shows sites identified through these databases in 2019.

SHERIFF, FIRE, AND EMERGENCY SERVICES
Goals
PS-G-5 Public Safety
Maintain safety services that are responsive to citizens’ needs to ensure a safe and secure environment for people and property in the community.

The City continues to fund and administer the Flock Safety Automated License Plate Reader (ALPR) system as an investigative tool to close out cases and prevent criminal activity. The City has also invested $50,000 into additional burglary
prevention/suppression patrols, which in partnership with the Los Angeles Sheriff’s Department is designed to focus on burglary suppression activity to reduce property crimes in residential and commercial areas in the City.

See Public Safety Chapter Goal PS-G-1
City Manager’s Office
PS-G-6 Public Safety
Support community-based policing partnerships to enhance public awareness of crime prevention and strengthen the relationship between the Los Angeles County Sheriff’s Department and neighborhoods throughout the city.

The City continued to distribute information through its “Let’s Talk Public Safety” program, primarily through law enforcement safety blogs and videos. New to 2025, the City collaborated with the County of Los Angeles Sheriff’s Department, Los Angeles County Fire Department, and Inland Valley Humane Society to host a series of “Meet Your Public Safety Services Providers” events. The four informational meetings provided residents an opportunity to hear from the City’s local public safety providers, including programs and services such as Neighborhood Watch, Business Watch, fire prevention and emergency preparedness, animal licensing efforts and living with wildlife. Additionally, The “Coffee with a Cop” meetings are held once a month at locations through the City, where residents and businesses can talk with a member of the Sheriff’s Department about crime and other law enforcement techniques.

Also applies to Public Safety Chapter Policy PS-P-30
City Manager’s Office
PS-G-7 Public Safety Provide effective emergency preparedness and response programs.

See Public Safety Chapter Policy PS-P-37 City Manager’s Office Policies
PS-P-29 Public Safety
Coordinate with the Los Angeles County Sheriff’s Department for review of applications for new development and for the
intensification of existing development, ensuring that review is consistent with Crime Prevention Through Environmental Design (CPTED) principles.

See Public Safety Chapter Goal PS-G-6 City Manager’s Office

PS-P-30 Public Safety
Continue to promote the establishment of neighborhood watch and business watch programs to encourage community participation in the patrol of neighborhoods.

See Public Safety Chapter Goal PS-G-6 City Manager’s Office PS-P-37 Public Safety
Maintain area-wide mutual aid agreements and communication links with adjacent governmental authorities and other participating jurisdictions.

The City continues to expand upon its emergency preparedness and response capabilities through training, testing, and exercises. The dedicated EOC provides the City with added flexibility to coordinate and respond to emergencies, provide redundant communications to public safety agencies, and enable added communications to residents. City Hall also has a backup power generator to ensure critical systems are operational in the event of a prolonged emergency outage, with redundant communications capabilities including the Sheriff’s Department and County Office of Emergency Management (OEM). The City participated in the annual Great California Shakeout in October 2025, and will continue efforts with additional training and exercises in collaboration with LA County OEM, local school districts, and adjoining municipalities.

Also applies to Public Safety Chapter Goal PS-G-7 and Policies PSP-40, PS-P-41, and PS-P-43 City Manager’s Office

EMERGENCY AND DISASTER MANAGEMENT
Goals
PS-G-8 Public Safety
Use the Local Hazard Mitigation Plan and Emergency Operations Plan to address mitigation and response for local hazards, including seismic hazards, flood hazards, fire hazards, hazardous materials incidents, and hazardous sites, and to plan for the protection of critical facilities (i.e., schools, hospitals), disaster and emergency response preparedness and recovery, evacuation routes, peak load water supply requirements, and minimum road width and clearance around structures.

See Public Safety Chapter Goal PS-G-2 City Manager’s Office PS-G-9 Public Safety
Conduct emergency and disaster management planning in a collaborative manner with State and local agencies and neighboring jurisdictions, while striving for self-sufficiency in City-level emergency response.

See Public Safety Chapter Policy PS-P-14 City Manager’s Office Policies
PS-P-38 Public Safety
Maintain, review, and update Diamond Bar’s Local Hazard Mitigation Plan as needed to take into account new hazard conditions in the Planning Area and new emergency management techniques.

See Public Safety Chapter Goal PS-G-2 City Manager’s Office PS-P-39 Public Safety Adopt, implement and update as necessary the Local Hazard Mitigation Plan to develop strategies to address changing risks from See Public Safety Chapter Goal PS-G-2 City Manager’s Office

flood, drought, fire, landslides, seismic activity, hazardous materials, and other potential hazards, including strategies related to monitoring, emergency preparedness, development policies, conservation, vulnerable populations, and community resilience.

PS-P-40 Public Safety
Continue to coordinate the City’s emergency preparedness and response plans and operations with the State Office of Emergency Management, Los Angeles County, schools, and other neighboring jurisdictions.

See Public Safety Chapter Policy PS-P-37 City Manager’s Office PS-P-41 Public Safety
Maintain and expand as necessary community emergency
preparedness resources including personnel, equipment, material, specialized medical and other training, and auxiliary
communications.

See Public Safety Chapter Policy PS-P-37 City Manager’s Office PS-P-42 Public Safety
Continue to disseminate public information and alerts regarding the nature and extent of possible natural and manmade hazards, resources identifying measures residents and businesses can take to prepare for and minimize damage resulting from these hazards, citywide response plans, and evacuation routes.

The City issues regular emergency preparedness updates and information on its website, public access television channels, social media accounts, print newsletters, and e-subscription services/Civic Ready notification service. Emergency preparedness topics are also covered in the eight-meeting City Government Explained series, four-meeting Let’s Talk Public Safety series, and in Council presentations throughout the year.

Community Relations
Division
PS-P-43 Public Safety
Require all City staff to be adequately trained to respond to emergency situations, and conduct regular emergency
preparedness drills with local organizations including the Los Angeles County fire and Sheriff’s departments.

See Public Safety Chapter Policy PS-P-14 City Manager’s Office PS-P-44 Public Safety
Leverage pre- and post-disaster assistance programs to support resilient planning, mitigation, and reconstruction strategies that consider future climate conditions, such as the California Governor’s Office of Emergency Services’ Hazard Mitigation Grant Program and California Disaster Assistance Act.

See Public Safety Chapter Policy PS-P-37 City Manager’s Office NOISE
Policies
PS-P-49 Public Safety
Ensure that detailed site-specific noise analysis, including the identification of noise mitigation measures, be prepared for all development proposals located where project noise exposure would be other than normally or conditionally acceptable as specified in Table 7-1. With mitigation, development should meet the allowable exterior and interior noise exposure standards established in the Noise Control Ordinance.

During grading and construction activities, development projects are required to properly muffle all construction equipment to reduce noise levels.

Public Works and
Community
Development
PS-P-52 Public Safety Ensure that noise attenuation facilities are installed as feasible in all noise-sensitive areas impacted by County, State, or federal See Land Use & Economic Development Chapter Policy LU-P-14. Public Works

highways through coordination with Caltrans and the Federal Highway Administration.

The SR57/60 Confluence Project will install sound walls wherever applicable and necessary within the limits of the project.

7. Community Health & Sustainability
POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT

COMMUNITY HEALTH & SUSTAINABILITY
The Goals and Policies in this Chapter identify strategies to facilitate healthy and active lifestyles, social connections and celebrating diversity, access to healthy food, and climate change resilience. Many of these strategies could be incorporated into existing or future City programs and Development Code standards.

ACTIVE LIFESTYLE
Goals
CHS-G-3 Community Health &
Sustainability
Promote the use of public parks, recreational and other spaces for healthy exercise and physical activity.

Dozens of enrichment classes and athletic opportunities are provided throughout the year at local parks by the City, independent contracts, or non-profit organizations.

Parks & Recreation
Policies
CHS-P-1 Community Health &
Sustainability
Strive to ensure that all areas of the community have an equal distribution of public parks and public recreational facilities to maximize access.

On January 21, 2025, the 10.23-acre property located at 22601 Sunset Crossing Road was transferred to the City at no cost by a Transfer Agreement Facilities Use Agreement. This property combined with the adjacent City-owned 2.78-acre site will create a 13-acre park site that has the potential to be developed into a community park with amenities for residents of all ages, interests and activity levels.

Parks & Recreation

SOCIAL CONNECTION
Goals
CHS-G-5 Community Health &
Sustainability
Enhance cultural and generational diversity and social connections through opportunities for volunteerism and civic engagement, public gathering places, public art, family-friendly activities, and events that connect residents to one another, helping them to stay socially active in the community.

The City provides annual City-wide special events and senior programming that support teens looking to volunteer and seniors interested in intergenerational opportunities.

Parks & Recreation
CHS-G-6 Community Health &
Sustainability
Provide safe and welcoming opportunities for meeting and gathering that encourage face-to-face interactions between people.

The Diamond Bar Center and Heritage Park serve as “home” for six unique senior clubs who meet regularly throughout the week for both organized activity and leisurely gatherings.

Parks & Recreation
Policies
CHS-P-7 Community Health &
Sustainability
Continue to support and promote citywide events that integrate families, schools, and the greater community.

Many City-wide special events include partnerships with both local high schools and a middle school who are responsible for an active role in the event.

Parks & Recreation

POLICY # CHAPTER GOALS & POLICIES STATUS DEPARTMENT
CHS-P-9 Community Health &
Sustainability
Encourage and provide volunteer opportunities for residents to engage and support a wide variety of events and activities.

The Parks & Recreation Department offers volunteer opportunities for teens at events, seniors at the Diamond Bar Center, and adults through the youth sports programs.

Parks & Recreation
CHS-P-13 Community Health &
Sustainability
Support the provisions of spaces, programs and facilities across the community to provide opportunities for artistic and cultural engagement and expression for all members of the Diamond Bar community.

The City provides annual live Concerts in the Park at no charge.

These performances including a variety of genres and entertainment for all ages.

Parks & Recreation
CHS-P-14 Community Health &
Sustainability
Encourage the development of “destinations”—such as the clusters of commercial uses that draw residents from the entire community into the Neighborhood Mixed Use, the Transit-Oriented Mixed Use, and the Town Center focus areas.

See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Community
Development
CHS-P-15 Community Health &
Sustainability
Encourage the establishment of gathering areas in new
neighborhoods. See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Community
Development

HEALTHCARE & HUMAN SERVICES

HEALTHY FOOD
Policies
CHS-P-21 Community Health &
Sustainability
Promote healthy food and beverages at City-sponsored events, programs, and recreation activities. Ensure that safe, clean drinking water is available for the public at all City-owned buildings where public programs occur.

Clean drinking water is available at all City facilities and a variety of food trucks typically provide an array of food and beverage options at City-sponsored special events. Staff is also provided with clean drinking water at events. Water bottle filling stations are available at the Diamond Bar Center and also included at parks when replacing the previous drinking fountain.

Parks & Recreation
CHS-P-24 Community Health &
Sustainability
Explore opportunities as they arise to incorporate community gardens into City parks and open space areas, and encourage the Diamond Bar Community Garden and other organizations to facilitate the development, administration, and operation of additional community gardens in the City.

Compost and mulch is available year-round at Sycamore Canyon Park to support community members in maintaining their home gardens. This resource is part of the City’s commitment to promoting sustainable gardening practices.

To further educate residents, the City offers workshops at community events focused on composting techniques and organic gardening methods. Additionally, the monthly EnviroLink newsletter provides valuable information and resources on these topics, helping residents learn how to effectively use compost and mulch while reducing organic waste. These efforts aim to empower the community with the knowledge and tools needed for sustainable gardening.

City Manager’s Office

PUBLIC HEALTH AND ENVIRONMENTAL JUSTICE
Policies
CHS-P-30 Community Health &
Sustainability
Support a better informed and civically engaged community by making information available both in print and electronic format, and, to the extent possible, provide this information in the languages predominantly spoken in the community.

The City's efforts to keep community members informed and engaged include using various communication channels to give residents the choice of how they receive information and participate in the decision-making process. These channels include a monthly printed newsletter mailed to all Diamond Bar addresses, a weekly electronic newsletter, Weekly Highlights, sent via email or text to subscribers, a mobile app, two-way engagement on Facebook, and regular postings on Instagram and YouTube. In 2025, the City expanded its improvement in communication by making the City's government access channel, Diamond Bar TV, (DBTV) available for free streaming on Roku and the Cablecast app. Previously only available on Spectrum Cable Channel 3 or Frontier FiOS television Channel 47, DBTV is one of the many ways the City shares information about City programs, projects and services with the community. Programming on DBTV include City Council meeting replays, local business spotlights, public safety videos, and the DB Minute video shorts series that covers various City services and programs.

Community Relations
Division

CLIMATE CHANGE AND GREENHOUSE GASES
Goals
CHS-G-13 Community Health &
Sustainability Promote energy efficiency and conservation in the community.

The City has partnered with the San Gabriel Valley Council of Governments (SGVCOG) to increase public awareness of energy conservation programs and best practices from Southern California Edison and the Gas Company. Information is distributed through the City’s EnviroLink newsletter, as well as direct communication from partner agencies and utility providers.

City Manager’s Office
CHS-G-14 Community Health &
Sustainability
Encourage waste reduction and diversion practices to meet State targets and reduce GHG emissions.

The City complies with all State laws governing waste management and recycling. The City continues to maintain its economic incentive programs, in partnership with its waste haulers, as described in prior years, to reduce waste and increase diversion under the new waste hauler contracts that began in September 2025.

During the transition to the new contracts, the City and its waste haulers implemented an education and outreach campaign to reeducate residents on proper sorting practices to increase diversion and reduce contamination. Outreach efforts included print and electronic materials, in-person and virtual workshops, and ongoing contamination monitoring.

City Manager’s Office

The City also continues to provide waste reduction tips through its monthly electronic environmental newsletter. In addition to its ongoing student education programs with Discovery Cube that focus on recycling and waste reduction, the City partnered with Algalita Marine Research to offer an additional educational experience for youth, focused on plastic pollution and prevention strategies.

Policies – Energy Efficiency & Conservation
CHS-P-39 Community Health &
Sustainability
Support Southern California Edison (SCE) and Southern California Gas Company's (SoCalGas) efforts to increase public awareness of energy conservation technology and best practices.

The City has partnered with the San Gabriel Valley Council of Governments (SGVCOG) to increase public awareness of energy conservation technologies and best practices from Southern California Edison and the Gas Company. Information is distributed through the City’s Envirolink newsletter, as well as direct communication from partner agencies and utility providers.

City Manager’s Office
CHS-P-44 Community Health &
Sustainability
Promote energy conservation and retrofitting of existing buildings through the implementation of the Green Building Codes.

The Building & Safety Division implements CALGreen by requiring all construction projects to meet State requirements. This is done through requiring all waste hauling by the City’s franchise hauler or to a recycling facility, requiring low emitting vehicle parking for new commercial projects, limiting VOCs, inspecting erosion control, and requiring low water usage in plumbing.

Community
Development
Policies – Waste Reduction & Recycling
CHS-P-46 Community Health &
Sustainability
In order to achieve compliance with the source reduction goals set forth under Assembly Bill (AB) 939 amendments thereto,
incorporate solid waste diversion goal performance standards into the contracts with the City’s franchise waste haulers, and enforce the City’s Construction and Demolition Waste Ordinance.

The City Manager’s Department has been actively working on new solid waste franchise agreements, launched in 2025. To meet the source reduction goals of Assembly Bill (AB) 939 and its amendments, the City is incorporating solid waste diversion performance standards into the contracts by standardizing monthly and annual reporting with franchise waste haulers. This initiative supports the City’s commitment to compliance and sustainability.

The City is also strengthening its Construction and Demolition Waste Ordinance by updating applications and improving intake and processing procedures, further emphasizing responsible waste management practices.

City Manager’s Office
CHS-P-47 Community Health &
Sustainability
Reduce the disposal of household hazardous wastes in landfills through continued cooperation with waste pick-up service providers, the County Sanitation Districts, and the Los Angeles County Department of Public Works in the provision of curbside pick-up and annual household waste round up events.

The City is actively working to reduce household hazardous waste (HHW) disposal in landfills by collaborating with waste service providers, the County Sanitation Districts, and the Los Angeles County Department of Public Works. These efforts include organizing, supporting, and promoting annual HHW round-up events. The City enhances these initiatives with the Door-to-Door curbside collection program through waste hauler and provides information about local drop-off locations for common HHW as alternatives to curbside pickup or the annual County collection event in Diamond Bar. The City promotes nearby County HHW events City Manager’s Office

hosted in other cities. The City held two e-waste collection events, one in April and another in August, and plans to expand to three ewaste events next year to further reduce environmental impacts. The City continues to monitor and support the collection of batteries and light bulbs at the local Ace Hardware.

CHS-P-48 Community Health &
Sustainability
Continue to promote the safe disposal of household hazardous waste through public education and incentives.

The City is dedicated to promoting the safe disposal of household hazardous waste (HHW) through education and incentives. We focus on raising awareness about proper disposal methods, including the local Ace Hardware takeback program, and
encouraging responsible waste management.

The City supports several collection programs and events, including the At Your Door curbside collection program, the annual County HHW collection event in Diamond Bar (held in March), and nearby County-hosted events in other cities. A local HHW recycling and disposal guide has been created and is distributed at events, community centers, and collection partners like Ace Hardware, AutoZone, and Sherwin-Williams. The guide is also included in the 2025 City Calendar mailed to all residents.

City Manager’s Office
CHS-P-49 Community Health &
Sustainability
Continue to educate residential, commercial, and industrial generators about source reduction and recycling programs and encourage their participation in these programs through promotional campaigns and incentives.

The City is committed to promoting source reduction and recycling through targeted education for residential, commercial, and industrial sectors. Educational efforts include outreach campaigns delivered through waste hauler billing inserts, City newsletters, social media, the City’s website, community events, and workshops.

Waste haulers also provide in-person and virtual workshops focused on proper sorting practices and contamination minimization.

To encourage participation, the City offers free incentives such as food waste kitchen pails, compost bins, and used oil collection kits.

In addition, the City has extended its contract with its waste and recycling education provider, Discovery Cube, and launched a new environmental education partnership with Algalita Marine Research, focusing on plastic waste, pollution, and prevention strategies.

City Manager’s Office
CHS-P-50 Community Health &
Sustainability
Encourage generators of edible food to have contracts or agreements with food rescue organizations to minimize edible food from being disposed of or destroyed.

In our ongoing efforts to minimize edible food waste, the City contracted consultants are actively encouraging generators of edible food to establish contracts or agreements with food rescue organizations. This initiative aims to divert edible food from being needlessly disposed of or destroyed. The City is facilitating the establishment of partnerships between generators and food rescue organizations, fostering a collaborative approach to addressing food waste challenges.

City Manager’s Office

CHS-P-51 Community Health &
Sustainability
Encourage residents and businesses to compost leaves, grass clippings, food waste, and other organic materials by promoting existing food waste pickup services, residential waste hauler rate composting discounts, and residential backyard composting.

The City actively encouraged and re-educated residents and businesses on composting, proper sorting, and contamination reduction through a Citywide education campaign in preparation for the waste hauler transition scheduled for September 2025.

Information on hauler economic incentive programs, sorting guides, and additional disposal options was mailed to every resident and business in the City, providing comprehensive details on available waste-related programs.

To further expand outreach, waste haulers hosted a series of inperson and virtual workshops to reinforce proper sorting practices and program awareness. The City also continues to incorporate composting and food waste reduction information into its monthly electronic environmental newsletters and community events.

City Manager’s Office
CHS-P-52 Community Health &
Sustainability
Collaborate with the City’s contract waste haulers to educate and encourage residents and businesses about waste reduction strategies.

The City works closely with its franchised waste haulers to educate and motivate residents and businesses to adopt effective waste reduction strategies. As part of the hauler transition, businesses are now required to source-separate recyclables from trash. To support this effort, WM mailed sorting guides and additional program information to each business. During the rollout of the program, businesses received additional education focused on proper recycling practices and contamination reduction and one-on-one support in implementing these practices.

Through continued collaboration, the City ensures that residents and businesses receive consistent waste reduction information through newsletters from both the haulers and the City, as well as through site visits, phone calls, and emails. The City remains committed to strengthening these partnerships and fostering a culture of responsible waste management throughout the community.

City Manager’s Office
CHS-P-53 Community Health &
Sustainability
Support and cooperate with County and State regulatory agency efforts to require commercial and industrial generators to develop and implement a source reduction and recycling plan tailored to their individual waste streams.

The City supports and cooperates with County and State regulatory agencies to implement measures that require commercial and industrial generators to develop and execute source reduction and recycling plans tailored to their unique waste streams. Our collaborative efforts aim to ensure compliance with regulations, where applicable, while promoting sustainable waste management practices among businesses.

City Manager’s Office
Policies – Climate Change Resiliency
CHS-P-57 Community Health &
Sustainability
Encourage water conservation, drought-tolerant landscaping and the use of greywater and reclaimed and recycled water, where appropriate, with a view to reducing water use.

During project review, the Planning Division ensures that the plant palette is diverse, Southern California native and drought-tolerant vegetation is utilized, and that the planting and irrigation plans comply with the City’s Water Efficient Landscaping Ordinance. Also, Community
Development

reclaimed water is required for nonresidential irrigation systems where available.

See Resource Conservation Chapter Goal RC-G-6.

CHS-P-59 Community Health &
Sustainability
As resources become available, increase the efficiency of water usage in public places, such as irrigation in public parks, and utilize drought-tolerant landscaping in City parks and streetscapes.

See Community Conservation Chapter Policy CC-P-5. Public Works

8. Housing – 2021-2029 (6th Cycle) Housing Element Program Evaluation PROGRAM # OBJECTIVES STATUS

HOUSING
The Housing Element, which has been certified by the California Department of Housing and Community Development (HCD) on October 5, 2022, identifies and makes provisions for existing and future housing needs.

While most of these enabling policies require the participation of the private sector, the City also actively participates in implementation by budgeting a portion of its annual Community Development Block Grant (CDBG) allocation and state Permanent Local Housing Allocation (PLHA) funds to administer the City’s Home Improvement Program (HIP). The HIP provides zero-interest deferred loans of up to $30,000 to eligible low-income households to perform essential home repairs and improvements. Low-income households are also eligible to participate in the Los Angeles County Community Development Commission’s CDBG-funded Home Ownership Program (HOP) for first-time homebuyer assistance.

The City will file the Housing Element Annual Progress (APR) with HCD and Office of Planning and Research (OPR) by April 1, 2026, which outlines progress on the implementation of the adopted 2021-2029 (6 th
Cycle)
Housing Element. The table below summarizes the 2021-2029 Housing Element housing programs offered through the Community Development Department along with program objectives, accomplishments, and implementation status.

1. Residential Neighborhood Improvement
Program
Continue to implement the code enforcement program, and direct eligible households to available rehabilitation assistance to correct code violations.

Provide focused code enforcement and rehabilitation assistance for 5 to 6 households during the planning period in neighborhoods evidencing concentrations of deteriorating units.

The City continues to operate the code enforcement program. This program is successful and is being continued. Code enforcement cases have increased in number and complexity due to factors including aging housing stock and the declining financial resources of longtime residents. The code enforcement officers and building inspectors are typically the first public officials to learn which homeowners lack the financial resources to correct property maintenance violations, and in the process, become aware of other deferred maintenance issues. The officers carry copies of the City’s Home Improvement Program (HIP) brochures and inform homeowners potentially in need of assistance that the City offers no-interest, deferred loans for essential home repairs.

2. Home Improvement Program
Improve neighborhoods evidencing deferred maintenance through property maintenance and rehab. Provide minor repair and rehabilitation to 4 units annually.

The City allocates at least $100,000 of its annual CDBG award to the Home Improvement Program. The HIP provides zero-interest loans of up to $30,000 to low- and very-low-income homeowners, which do not need to be repaid unless the home is sold or refinanced. There is a waiting list of pre-screened applicants, and HIP loans are processed in the order received.

The HIP Program Policies are highlighted below:
• The maximum loan amount for single-family detached homes increased from $20,000 to $30,000.

PROGRAM # OBJECTIVES STATUS
• Owner-occupants of condominiums that meet the household income requirements are now eligible for HIP loans for up to $20,000, provided that PLHA funds are available. The maximum loan amount is lower than the cap for single-family detached homes because costlier improvements, such as roof maintenance and exterior repairs, are the responsibility of the condominium HOAs, not the individual homeowners.
• PLHA funds may be used to issue loans to households (both single-family detached and condominium) earning up to 150% of the Area Median Income (AMI) for L.A. County. CDBG funds continue to be restricted to owneroccupied households of single-family detached housing earning no more than 80% of AMI.
• A minimum loan amount of $10,000 is now required. Previously, no minimum was specified. Establishing a minimum loan amount encourages homeowners to address more improvements at once, and provides economies of scale with respect to the administrative costs associated with processing loans.

The HIP is successful in improving housing conditions and is being continued at available funding levels.

3. Section 8 Rental Assistance Program Continue to direct eligible households to the County Section 8 program.

This program is beneficial in reducing problems such as overpayment and overcrowding. City continues to coordinate with the County on the Section 8 program. Handouts are available at the public counter and contact information is regularly provided to requestors. The program is being continued.

4. Preservation of Assisted Housing Preserve 100 percent of the 149 low- and moderate-income units in The Seasons Apartments.

Diamond Bar contains only one assisted housing project, the 149-unit Seasons Apartments (formerly Heritage Park) for senior citizens. This project was constructed in 1988 and was originally financed under the Los Angeles County Multi-Family Mortgage Revenue Bond program. The project was refinanced in November 1999 under the California Community Development Authority's MultiFamily Housing Re-funding Bond, and was transferred to the Corporate Fund for Housing, a non-profit organization. According to the terms of the new bond agreement, income restrictions for residents and corresponding rent limits were set. For the duration of the bond, which expires December 2, 2034, all units will be affordable: 30 units (20%) will be very-low-income, 82 units (55%) will be lowincome, and 37 units will be moderate-income (defined as 100% AMI). All units will be preserved.

5. Mobile Home Park Preservation Continue to support preservation of the City's two mobile home parks as important affordable housing resources.

Zoning for mobile home parks is successful in preserving this affordable housing option and is being continued. No proposals to close the parks were submitted.

The City will continue to support preservation of its two mobile home parks as important affordable housing resources.

PROGRAM # OBJECTIVES STATUS

6. First-time Homebuyer Assistance
Programs
Advertise County's Home Ownership Program (HOP) and Mortgage Credit Certificate (MCC) and provide information to interested homebuyers. In addition, the City will work with realtors to make them aware of these programs.

The City advertised these programs on the City website and will provide information to interested homebuyers annually via City newsletters and through social media. In addition, the City will work with realtors to make them aware of these programs.

7. Senior and Workforce Housing
Development
Identify and evaluate sites suitable for new senior and workforce housing. The City will post information on the City website during the first year of the planning period regarding the City's interest in assisting in the development of senior and workforce housing, provide information on available regulatory and financial incentives, and assist developers in applying for funds. The City will also contact local colleges and universities annually to identify potential partnership opportunities for affordable housing.

This program is intended to encourage affordable housing development and is being continued. The City is a member of the San Gabriel Valley Regional Housing Trust (SGVRHT), which is a joint powers authority. SGVRHT’s focus is primarily on providing funding assistance in the planning and construction of new homeless and affordable housing. The Trust provides funding and loans to help bridge funding gaps for affordable housing projects. Land Use Policies 10 and 28, which were adopted in the 2019 General Plan Update, also encourage the production of senior and workforce housing.

8. Land Use Element and Zoning
Maintain adequate sites for housing development at all income levels in conformance with the RHNA and ensure compliance with No Net Loss requirements. Process Development Code amendments to provide adequate sites to accommodate the RHNA. Update all regulations and fees on the City website annually throughout the planning period. Notify water and sewer providers immediately upon adoption of the Housing Element.

The City has maintained adequate sites for housing development at all income levels and ensure compliance with No Net Loss requirements. In May 2022, the City entered into a Consultant Services Agreement with Torti Gallas + Partners to prepare the Town Center Specific Plan (TCSP) in the Town Center MixedUse focus area, which is one of the sites to accommodate the RHNA. Continual progress has been made on the Specific Plan during the planning period. The 45-day public review period for the Supplemental SIR was August 25 through October 10, 2025. On February 10, 2026, the Planning Commission recommended approval to the City Council, and is tentatively scheduled for the March 3, 2026 City Council hearing.

On February 4, 2025, the City rezoned the General Plan’s three Mixed-Use designations (Town Center Mixed-Use, Neighborhood Mixed-Use and TransitOriented Mixed-Use focus areas) to allow residential development at a minimum density of 20 dwelling units per acre and a maximum density of at least 30 dwelling units per acre.

On November 15, 2022, the City notified the water and sewer providers immediately upon adoption of the Housing Element.

9. Mixed Use Development
Prepare handout and marketing materials encouraging mixed-use development where appropriate and make it available to interested developers throughout the planning period.

In December 2019, the City adopted the Comprehensive General Plan Update that created community visions and blueprint for growth and development in the City through 2040. One of the key features of the new General Plan was the establishment of three new Focus Areas where substantial land use changes are planned as part of a strategy to provide walkable mixed-use activity centers.

Goals and policies to promote mixed use developments are as follows: Land Use Goals 12, 14, 15, 16, 18, 19, 22, 24, 26, Land Use Policies 15, 16, 21, 23, 27, 28, 29, 35, 45; Community Character and Placemaking Goals 7, 8, 14, 17; and Circulation Goal 4.

PROGRAM # OBJECTIVES STATUS
In May 2022, the City entered into a Consultant Services Agreement with Torti Gallas + Partners to prepare the Town Center Specific Plan in the Town Center Mixed-Use focus area. The TCSP will provide the regulatory and urban design framework to establish a downtown, or “Town Center” in Diamond Bar as a walkable place with entertainment, retail, restaurants, community gathering spaces, and urban housing opportunities. This program is an important component of the City’s overall strategy to revitalize older areas and expand housing production. The 45-day public review period for the Supplemental SIR was August 25 through October 10, 2025. On February 10, 2026, the Planning Commission recommended approval to the City Council, and is tentatively scheduled for the March 3, 2026 City Council hearing.

See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

10. Accessory Dwelling Units Continue to encourage construction of ADUs through an informational handout available at City Hall and on the City website throughout the planning period.

In 2017, the City approved an amendment to the municipal code pertaining to accessory dwelling units to satisfy all of the requirements of Government Code §§65852.150-65852.2. Per AB 68 (Ting), AB 587 (Friedman), AB 671 (Friedman), AB 881 (Bloom), SB 13 (Wieckowski) that went into effect January 1, 2020. In 2021 the City adopted a subsequent amendment to ADU regulations in accordance with the new State laws. On July 16, 2024, the City adopted another Development Code Amendment for consistency with the most recent passages of AB 2221 (Quirk-Silva) and SB 897 (Wieckowski). The updated ADU Ordinances have been effective in supporting the production of ADUs and provides affordable rents to low- and moderate-income households.

An ADU handout has been created which is being distributed at the public counter. The City continues to encourage accessory dwelling units and this program is being continued.
51 building permits for ADUs totaling 38,407 square feet were issued.

The City is in the early testing phase of its Pre-Approved Accessory Dwelling Unit (ADU) Program, known as DBADU, which supports the City’s General Plan housing goals by streamlining ADU development and expanding housing opportunities. The program is implemented pursuant to State ADU law, including Government Code Sections 65852.2 and 65852.22, which require ministerial approval of ADUs that comply with objective standards and encourage jurisdictions to reduce regulatory barriers to ADU construction. The DBADU program allows qualified design professionals to submit ADU plans for City review and pre-approval, with the intent of creating a catalog of code-compliant designs that homeowners may use to reduce permitting time and uncertainty.

To support implementation, City staff has developed a dedicated program

PROGRAM # OBJECTIVES STATUS
website and application materials, and the City is currently piloting the program with a selected firm to test workflows and review procedures before opening participation to additional professionals and releasing pre-approved plans for broader public use. The DBADU is set to be open to the public in early 2026.

11. Housing for Persons with Special Needs
Continue to facilitate emergency shelters and transitional/ supportive housing and continue participating with LAHSA and SGVCOG on efforts to address homelessness throughout the planning period. Process an amendment to the Development Code to allow supportive housing, low barrier navigation centers and large residential care facilities consistent with State law.

On July 16, 2024, the City adopted a Development Code Amendment to allow supportive housing and low barrier navigation centers consistent with State law and to replace or modify the CUP requirement to provide greater objectivity and development certainty for residential care facilities serving seven or more persons in all residential zones.

12. Affordable Housing Incentives/ Density
Bonus
Amend the Development Code in 2021 consistent with current Density Bonus Law and continue to encourage the production of affordable housing through the use of density bonus and other incentives.

This program is being continued in compliance with recent changes to State density bonus law. City staff discusses opportunities for affordable housing and density bonuses with developers for housing projects. As mentioned above, an inclusionary housing requirement is also being considered for the TCSP, in addition to other incentives to increase density. The density bonus program is among several tools the City utilizes to facilitate affordable housing. On July 16, 2024, the City adopted a Development Code Amendment to be in conformance with current Density Bonus Law.

The City is also a member of the San Gabriel Valley Regional Housing Trust (SGVRHT), which is a joint powers authority. SGVRHT’s focus is primarily on providing fundings assistance in the planning and construction of new homeless and affordable housing. The Trust provides funding and loans to help bridge funding gaps for affordable housing projects.

13. Efficient Project Processing Continue to offer streamlined development processing, and periodically review departmental processing procedures to ensure efficient project processing.

The City continues to offer efficient permit processing. As a small city, staff is able to work closely with applicants through the review and approval process, thereby helping to expedite the entitlement process to issuance of building and zoning permits. In addition, the City has several procedures in place to minimize project review times, which include concurrent processing, pre-application reviews, and recently adopted General Plan EIR, which allows for individual projects that fall within the scope of the EIR to utilize this as environmental clearance under CEQA.

Practices to streamline the issuances for residential projects such as room additions and ADUs have been implemented to eliminate the need to submit a separate application for Planning prior to applying for building permits. The pandemic accelerated implementation of online permit services, and by June 2020, applicants were able to submit applications, plans and payments entirely online. In 2023, the City embarked on the implementation of a new permitting software (Enterprise Land Management system), which will eventually streamline City processes and project processing and expected to go live by

PROGRAM # OBJECTIVES STATUS
July 2026. This program will be further enhanced through revisions to the Development Code.

14. Affirmatively Furthering Fair Housing
Explore and pursue alternative land use strategies and make necessary amendments to zoning and other land use documents to facilitate a variety of housing choices, including but not limited to higher density opportunities on religious, institutional and quasi-institutional lands, missing middle zoning in addition to SB9 such as SB10, adaptive reuse, more than one JADU per structure, acquiring and adding affordability to existing structures and upzoning with the goal of 50 housing opportunities in the planning period.

On December 21, 2021, the City adopted an urgency ordinance to expand the housing supply in single-family zones by allowing for lot splits and duplexes under the parameters of SB 9. The permanent ordinance is anticipated for Planning Commission hearing in the Fall of 2026.

The City continues to distribute fair housing information at the public counter through brochures, and refers fair housing related complaints to the Housing Rights Center.

15. Reasonable Accommodation for
Persons with Disabilities
Continue to implement reasonable accommodation procedures for persons with disabilities in compliance with SB 520.

The City supports the provision of housing for disabled persons through zoning opportunities for transitional housing, reasonable accommodation procedures, and programs to facilitate affordable housing. In 2010, the City adopted an ordinance to facilitate reasonable accommodations. This program is an important component of the City’s overall efforts to address the special housing needs of persons with disabilities and is being continued and revised to include additional amendments to City regulations to incorporate recent changes to State law.

The City is currently processing a Development Code Amendment to ensure that reasonable housing accommodation procedures do not inadvertently act as a constraint on persons with disabilities. The Code Amendment is anticipated for Planning Commission hearing in the Fall of 2026.

Climate Action Plan

CAP POLICIES AND ACTIONS IMPLEMENTATION GENERAL PLAN GOALS & POLICIES CLIMATE ACTION PLAN (“CAP”)
A Climate Action Plan is a comprehensive inventory of specific activities a public agency should undertake to reduce greenhouse gas (“GHG”) emissions that originate within its jurisdiction. The City of Diamond Bar adopted a Climate Action Plan concurrently with the General Plan Update to document how it will be able to reduce its GHG emissions in compliance with State mandates and goals to the year 2040, which is the horizon year for the General Plan Update. The table below lists the General Plan Update goals and policies that have been implemented to reduce GHG emissions, quantifies emissions reductions, and explains how these policies and actions will be implemented and organized according to the following categories: 1. Pedestrian Improvements and Increased Connectivity; 2. Bikeway System Improvements; 3. Traffic Calming; 4. Electric Vehicle Infrastructure; 5. Parking Facilities and Policies; and 6. Transportation Improvements.

1. Pedestrian Improvements and
Increased Connectivity
The General Plan Update includes policies that create more walkable, livable neighborhoods by expanding the multimodal transportation system and creating a safe, pedestrian-oriented environment. Providing an improved pedestrian network and increasing connectivity encourages people to walk more and results in people driving less, causing a reduction in vehicle miles traveled (VMT).

LU-P-9: See status above.

LU-P-14: See status above.

CC-G-5: See status above.

CC-P-4: See status above.

CC-P-7: See status above.

CC-P-9: See status above.

CC-P-21: See status above.

2. Bikeway System Improvements
The General Plan Update provides strategies for maximizing multi-modal accessibility to and connectivity within mixed use areas, including the Metrolink Station and new Town Center. With the total bicycle improvements listed in the General Plan Update, there would be approximately 2.4 miles of bike lanes per square mile. Diamond Bar currently has approximately 2,840 people per square miles. This corresponds to a 0.06 percent reduction in VMT emissions.

LU-P-14: See status above.

CC-G-5: See status above.

CC-P-7: See status above.

CR-G-2: See status above.

CR-P-30: See status above.

CR-P-43: See status above

3. Traffic Calming
A 0.25 percent reduction in VMT was assumed to occur from the traffic calming improvements to make streets safer and more comfortable for pedestrian travel. Traffic calming devices include roundabouts, corner bulb-outs, speed cushions, surface textures, raised pavement, road narrowing, and other devices that encourage people to drive more slowly or to walk or bike instead of using a vehicle, especially for short trips in and around residential neighborhoods.

CR-P-4: See status above.

CR-P-21: See status above.

CR-P-22: See status above.

CR-P-23: See status above.

4. Electric Vehicle Infrastructure
A 0.05 percent reduction in VMT was assumed to occur from installation of electric vehicle infrastructure, which will encourage Diamond Bar residents, businesses, and the City vehicle fleet to switch to clean fuel and electric vehicles in order to reduce energy use and cost and transportation related GHG emissions.

RC-P-28: See status above.

5. Parking Facilities and Policies
Parking policies reflect both the necessity of providing for adequate and appropriately located vehicle and bicycle parking in existing and new development, and priorities related to safety, urban design, and transportation management. Reduced parking standards and other policies reducing parking availability have an estimated 5 to 12.5 percent VMT reduction.

Conservatively assuming the effect of General Plan parking reduction strategies would result in the lower end of VMT reduction, the cumulative reduction from implementations would result in a 5 percent VMT reduction.

N/A

6. Transportation Improvements
Transit service can provide an alternative to automobile travel and is a critical mode of transportation for those who cannot drive or do not have access to a vehicle. The General Plan policies support Metrolink ridership by improving bus, bicycle, and pedestrian connections to the station and by introducing Transit-Oriented Mixed-Use development around the station.

Conservatively assuming the combined effect of these strategies, summing the low end of the VMT reduction ranges gives a 0.62 percent reduction in VMT emissions.

CR-G-13: See status above.

CR-P-48: See status above.

Agenda Item #: 8.7
Meeting Date: March 17, 2026

CITY COUNCIL AGENDA REPORT
TO: Honorable Mayor and Members of the City Council
FROM: Daniel Fox, City Manager
SUBJECT: Housing Element Annual Progress Report for 2025.

STRATEGIC GOAL: Open, Engaged and Responsive Government RECOMMENDATION:

Approve the report for filing with the State Department of Housing and Community Development (HCD) and the Governor's Office of Planning and Research (OPR).

FINANCIAL IMPACT:

None.

BACKGROUND:

Government Code Section 65588 requires that each local government review its Housing Element as frequently as appropriate to evaluate all of the following:

1. The appropriateness of the housing goals, objectives, and policies in contributing to the attainment of the state housing goal;

2. The effectiveness of the Housing Element in attainment of the community’s housing goals and objectives;

3. The progress of the city, county, or city and county in implementation of the Housing Element; and

4. The effectiveness of the Housing Element goals, policies, and related actions to meet the community's needs.

The City’s 6th Cycle (2021-2029) Housing Element was adopted by the City Council on August 11, 2022. The California Department of Housing and Community Development (HCD) reviewed the Housing Element and found it to be in full compliance with State Housing Element Law (Article 10.6 of the Gov. Code) in a letter dated October 5, 2022. With the adoption and certification of the City’s Housing Element, the City has initiated updates to the City’s Development Code to implement the goals, policies, and programs in the Housing Element.

Regional Housing Needs Assessment
Each California city is required to plan for new housing to accommodate a share of regional needs. The

Agenda Item #: 8.7
Meeting Date: March 17, 2026
Regional Housing Needs Assessment (“RHNA”) is the process established by State law in which housing needs are determined. The Southern California Association of Governments (SCAG) determines the housing growth needs by income category for cities within its jurisdiction, which includes the City of Diamond Bar. The City’s RHNA allocation for the 6th cycle planning period was 2,521 units, which was divided into income groups as follows:

Housing Element Annual Progress Report
Pursuant to Government Code Section 65400, local jurisdictions are required to file a Housing Element Annual Progress Report (APR) with HCD and the Office of Planning and Research (OPR) by the first of April each year.

The APR (Attachment 1) outlines progress on the implementation of the adopted 6th Cycle Housing Element.

Tables A and A2 list approvals and permits issued in 2025 for housing units, categorized by income category.

Table B counts those units toward the City’s RHNA obligation for the 2021-2029 planning period. Table D outlines progress toward implementation of the City’s Housing Element programs.

ANALYSIS:

Housing Units
According to the California Department of Finance (DOF) Diamond Bar had approximately 17,959 housing units in 2000, and 18,478 housing units in 2013. The DOF estimated that as of January 1, 2025, the City had approximately 18,921 housing units, comprised of 81.9% single-family residences, 16.3% multi-family units, and

1.8% mobile homes.

The City’s housing production for 2025 is summarized below:
• Four entitlement requests were approved for new single-family residences; • One building permit was issued for a new single-family residence; • 46 building permits were issued for new Accessory Dwelling Units (ADUs); • Five building permits were issued for new Junior Accessory Dwelling Units (JADUs); • Two single-family residences received certificates of occupancy; and • 32 ADUs received certificates of occupancy.

The 2025 reporting period shows that there was a decrease in the number of total building permits issued for new housing units compared to that of the previous year (a total of 61 building permits issued in 2024). There was also a decrease in the number new housing units that received certificates of occupancy compared to that of the previous year (a total of 43 issued in 2024).

The number of ADUs in Diamond Bar will continue to increase, largely due to the passage of several bills: SB 13, AB 881, AB 68(1), AB 587, and AB 671, which were intended to address the State’s housing shortage by easing development restrictions that cities and counties may place on ADUs. These new laws took effect on January 1, 2020, and on July 20, 2021, the City Council adopted Ordinance No. 01 (2021), updating the City’s ADU regulations to comply with State law. On July 16, 2024, the City adopted another Development Code Amendment for consistency with the most recent passages of AB 2221 (Quirk-Silva) and SB 897 (Wieckowski).

The updated ADU Ordinances have been effective in supporting the production of ADUs and provides

Agenda Item #: 8.7
Meeting Date: March 17, 2026
affordable rents to low- and moderate-income households.

Additionally, the City is in the early testing phase of its Pre-Approved ADU Program, known as "DBADU", which supports the City’s General Plan housing goals by streamlining ADU development and expanding housing opportunities. The program is implemented pursuant to State ADU law, including Government Code Sections 65852.2 and 65852.22, which require ministerial approval of ADUs that comply with objective standards and encourage jurisdictions to reduce regulatory barriers on ADU construction. The DBADU program allows qualified design professionals to submit ADU plans for City review and pre-approval, with the intent of creating a catalog of code-compliant designs that homeowners may choose from to reduce permitting time and uncertainty. To support implementation, City staff has developed a dedicated program website and application materials, and the City is currently piloting the program with a selected firm to test workflows and review procedures before opening participation to additional professionals and releasing pre-approved plans for broader public use.

Future opportunities for housing production lie primarily with ADUs and development in the mixed-use districts created under the current General Plan. On January 27, 2025, the City Council adopted a General Plan Amendment to allow a maximum residential density of 30 dwelling units per acre in the three mixed-use districts (Town Center Mixed-Use, Neighborhood Mixed-Use and Transit-Oriented Mixed-Use focus areas); Development Code Amendment to establish the Housing Element Site Overlay (“H”) zoning designation and associated development standards; and Zoning Map Amendment to rezone the sites identified in Program H-8 of the 2021-2029 Housing Element with the H zoning designation.

In May 2022, the City entered into a Consultant Services Agreement with Torti Gallas + Partners to prepare the Town Center Specific Plan (TCSP) in one of the mixed-use districts, which is also one of the housing sites identified in the Housing Element to accommodate the RHNA. The TCSP is an important component of the City’s overall strategy to revitalize older areas and expand housing production. On February 10, 2026, the Planning Commission recommended approval of the specific plan to the City Council, and the City Council approvedthe first reading of the TCSP at its March 3, 2026 hearing, which included a corresponding General Plan Amendment, Development Code Amendment, and Zoning Map Amendment to align the General Plan land use designations and zoning with the TCSP.

The 15 housing programs identified in the Housing Element include efforts to remove constraints to the maintenance, improvement, and development of housing, as listed under Table D of Attachment 1. All programs remained in effect during the reporting period.

PREPARED BY:

Mayuko Nakajima, Senior Planner, Community Development
ATTACHMENTS:

1. 2025 Annual Progress Report

Jurisdiction Diamond Bar
Reporting Year 2025
Housing Element Planning Period 6th Cycle
Current Year
Deed
Restricted 0
Non-Deed
Restricted 17
Deed
Restricted 0
Non-Deed
Restricted 0
Deed
Restricted 0
Non-Deed
Restricted 4
Deed
Restricted 0
Non-Deed
Restricted 24
Deed
Restricted 0
Non-Deed
Restricted 2
4 51
Units by Structure Type Entitled Permitted Completed
Single-family Attached 0 0 0
Single-family Detached 3 1 2
2 to 4 units per structure 0 0 0
5+ units per structure 44 0 0
Accessory Dwelling Unit 0 50 35
Mobile/Manufactured Home 0 0 0
Total 47 51 37
Infill Housing Developments and Infill Units Permitted # of Projects Units 51 51
0 0
59 105
83 0
0 0
Income Rental Ownership Total
Acutely Low 0 0 0
Extremely Low 0 0 0
Very Low 0 0 0
Low 0 0 0
Moderate 0 0 0
Above Moderate 0 0 0
Total 0 0 0
Streamlining Provisions Used - Permitted Units # of Projects Units SB 9 (2021) - Duplex in SF Zone 0 0
SB 9 (2021) - Residential Lot Split 0 0
AB 2011 (2022) 0 0
SB 6 (2022) 0 0
SB 423 (2023) 0 0
Ministerial and Discretionary Applications # of Units
Ministerial 56 102
Discretionary 3 3
Density Bonus Applications and Units Permitted
Number of Applications Submitted Requesting a Density Bonus 1 Number of Units in Applications Submitted Requesting a Density Bonus 44 Number of Projects Permitted with a Density Bonus 0
Number of Units in Projects Permitted with a Density Bonus 0 Housing Element Programs Implemented and Sites Rezoned Count 15 0
Cells in grey contain auto-calculation formulas
Programs Implemented
Sites Rezoned to Accommodate the RHNA
(Jan. 1 - Dec. 31)
10/15/2021 - 10/15/2029
Units Constructed - SB 423 Streamlining Permits
Number of SB 423 Streamlining Applications Approved
Very Low
Low
Moderate
Acutely Low
Extremely Low
Data is auto-populated based on data entered in Tables A, A2, C, and D Total Housing Applications Submitted:

Number of Proposed Units in All Applications Received:

Total Housing Units Approved:

Total Housing Units Disapproved:

Total Units
Housing Applications Summary
Use of SB 423 Streamlining Provisions - Applications
Number of SB 423 Streamlining Applications
Above Moderate
Indicated as Infill
Not Indicated as Infill
Building Permits Issued by Affordability Summary
Income Level

Date
Application
Submitted
Total
Approved
Units by
Project
Total
Disapproved
Units by
Project
Streamlining Historic Sites
Application
Status
Project Type Notes
2 3 4 6 7 8 9 10 12 13 14
Prior APN+ Current APN Street Address
Project
Name+
Local
Jurisdiction
Tracking ID
Unit Category
(SFA,SFD,2 to
4,5+,ADU,MH)
Tenure
R=Renter
O=Owner
Date
Application
Submitted
(see
instructions)
Acutely
LowIncome
Deed
Restricted
Acutely
LowIncome Non
Deed
Restricted
Extremely
Low-Income
Deed
Restricted
Extremely
Low-Income
Non Deed
Restricted
Very LowIncome
Deed
Restricted
Very LowIncome
Non Deed
Restricted
LowIncome
Deed
Restricted
Low-Income
Non Deed
Restricted
ModerateIncome
Deed
Restricted
ModerateIncome
Non Deed
Restricted
Above
ModerateIncome
Total

PROPOSED
Units by
Project
Total

APPROVED
Units by
project
Total

DISAPPROVE
D Units by
Project
Please select
state
streamlining
provision/s the
application was
submitted
pursuant to.

Is this project
located on a
site with an
associated
historical
designation as
outlined in
Government
Code Section
65400(a)(2)(N)
and reported on
Table L?
Did the
housing
development
application
seek
incentives or
concessions
pursuant to
Government
Code section
65915?
Were
incentives or
concessions
requested
pursuant to
Government
Code section
65915
approved?
Please
indicate the
status of the
application.

Is the project
considered a
ministerial
project or
discretionary
project?
Notes
+
Summary Row: Start Data Entry Below 0 15 0 0 4 1 0 38 4 1 42 105 83 0 8713040029 2234 Indian Creek PL2024-82 SFD O 7/14/2025 1 1 1 NONE No No No Approved Discretionary 8713035016 2521 Indian Creek PL2024-65 SFD O 5/28/2025 1 1 1 NONE No No No Approved Discretionary 8713038018 2725 Clear Creek PL2022-74 SFD O 2/26/2025 1 1 1 NONE No No No Approved Discretionary 8292009138 2235 S Diamond Bar PL2022-89 5+ R 1/16/2025 4 4 36 44 44 NONE No Yes Yes Approved Ministerial SB 35 8718033023 147 Pintado PR2025-2048 ADU R 12/30/2025 1 1 NONE No No No Pending Ministerial 8760017043 834 Glenwick PR2025-2028 ADU R 12/18/2025 1 1 NONE No No No Pending Ministerial 8760018023 20717 Northampton PR2025-2003 ADU R 12/16/2025 1 1 NONE No No No Pending Ministerial 8763009009 1280 Glenthorpe PR2025-1903 ADU R 12/2/2025 1 1 NONE No No No Pending Ministerial 8293008008 1310 Barberry PR2025-1867 ADU R 11/24/2025 1 1 NONE No No No Pending Ministerial 8292021028 21324 Pinehill PR2025-1807 ADU R 11/13/2025 1 1 NONE No No No Pending Ministerial 8293031025 22437 Birds Eye PR2025-1769 ADU R 11/6/2025 1 1 NONE No No No Pending Ministerial 8760017015 854 Adamsgrove PR20205-1721 ADU R 10/31/2025 1 1 NONE No No No Pending Ministerial JADU 8763001023 1038 Adel PR2025-1691 ADU R 10/27/2025 1 1 NONE No No No Pending Ministerial 8719015037 747 Lincoln PR2025-1640 ADU R 10/13/2025 1 1 1 NONE No No No Approved Ministerial 8763005003 1141 Hare PR2025-1502 ADU R 9/22/2025 1 1 NONE No No No Pending Ministerial 8281016019 23712 Meadow Falls PR2025-1499 ADU R 9/19/2025 1 1 1 NONE No No No Approved Ministerial 8760019017 20955 Moonlake PR2025-1310 ADU R 9/17/2025 2 2 NONE No No No Pending Ministerial ADU & JADU 8285016023 21339 Hipass PR2025-1445 ADU R 9/10/2025 1 1 NONE No No No Pending Ministerial JADU 8760020018 20955 Northampton PR2025-1439 ADU R 9/10/2025 2 2 NONE No No No Pending Ministerial ADU & JADU 8713038002 2514 Braided Mane PR2025-1390 ADU R 9/3/2025 1 1 NONE No No No Pending Ministerial 8718012021 369 Rock River PR2025-1375 ADU R 9/2/2025 1 1 1 NONE No No No Approved Ministerial 8702019054 23298 Forest Canyon PR2025-1235 ADU R 8/8/2025 2 2 NONE No No No Pending Ministerial ADU & JADU 8702006042 23833 Country View PR2025-119 ADU R 7/15/2025 1 1 1 NONE No No No Approved Ministerial 8292008028 21517 Pathfinder PR2025-1075 ADU R 7/8/2025 1 1 1 NONE No No No Approved Ministerial 8713014004 2950 Steeplechase PR2025-1083 ADU R 7/7/2025 1 1 NONE No No No Pending Ministerial 8292012026 1856 Morning Canyon PR2025-1063 ADU R 7/1/2025 1 1 1 NONE No No No Approved Ministerial 8292022030 1866 Fern Hollow PR2025-1059 ADU R 7/1/2025 1 1 1 NONE No No No Approved Ministerial 8714007001 3170 Hawkwood PR2025-1000 ADU R 6/24/2025 1 1 NONE No No No Pending Ministerial 8701030016 23715 Little Quail PR2025-1010 ADU R 6/23/2025 1 1 1 NONE No No No Approved Ministerial 8281016001 23705 Golden Springs PR2025-1009 ADU R 6/23/2025 1 1 NONE No No No Pending Ministerial 8703013032 23690 Bower Cascade PR2025-1006 ADU R 6/23/2025 1 1 1 NONE No No No Approved Ministerial 8285027018 21002 Bandana PR2025-930 ADU R 6/10/2025 1 1 1 NONE No No No Approved Ministerial 8293006015 22843 Mountain Laurel PR2025-928 ADU R 6/10/2025 1 1 1 NONE No No No Approved Ministerial 8293011063 22508 Cello PR2025-766 ADU R 5/13/2025 1 1 1 NONE No No No Approved Ministerial 8292004016 21372 Broken Arrow PR2025-759 ADU R 5/12/2025 1 1 1 NONE No No No Approved Ministerial 8714013001 3443 Crooked Creek PR2025-743 ADU R 5/8/2025 1 1 1 NONE No No No Approved Ministerial 8281033073 476 Wayside PR2025-738 ADU R 5/8/2025 1 1 1 NONE No No No Approved Ministerial 8706014008 1143 Overlook PR2025-724 ADU R 5/6/2025 1 1 1 NONE No No No Approved Ministerial 8704055018 24218 Gingerwood PR2025-714 ADU R 5/5/2025 1 1 1 NONE No No No Approved Ministerial 8293034034 1375 Deeplawn PR2025-712 ADU R 5/5/2025 1 1 1 NONE No No No Approved Ministerial 8714023012 21260 Chirping Sparrow PR2025-678 ADU R
4/28/2025
1 1 NONE No No No Pending Ministerial
8292020051 1732 Roundtree PR2025-1732 ADU R 4/18/2025 1 1 1 NONE No No No Approved Ministerial 8293007031 1329 Desert Willow PR2025-546 ADU R 4/15/2025 1 1 1 NONE No No No Approved Ministerial 8281032075 509 Armitos PR2025-531 ADU R 4/14/2025 1 1 1 NONE No No No Approved Ministerial 8701026036 23505 Grand Rim PR2025-516 ADU R 4/10/2025 1 1 1 NONE No No No Approved Ministerial 8704050004 24341 Seagreen PR2025-499 ADU R 4/7/2025 1 1 1 NONE No No No Approved Ministerial 8704050005 24343 Seagreen PR2025-442 ADU R 3/25/2025 1 1 1 NONE No No No Approved Ministerial 8765022008 20757 Rim Lane PR2025-406 ADU R 3/21/2025 1 1 1 NONE No No No Approved Ministerial 8285014018 2546 Sunbright PR2025-375 ADU R 3/18/2025 1 1 1 NONE No No No Approved Ministerial 8293040041 1433 Deerfoot PR2025-359 ADU R 3/17/2025 1 1 1 NONE No No No Approved Ministerial 8293035021 22566 Birds Eye PR2025-344 ADU R 3/12/2025 1 1 1 NONE No No No Approved Ministerial 8292018033 1727 Morning Canyon PR2025-294 ADU R 3/4/2025 1 1 1 NONE No No No Approved Ministerial JADU 8718027016 466 S. Rock River PR2025-260 ADU R 2/26/2025 1 1 1 NONE No No No Approved Ministerial 8292006016 2016 Evergreen Springs PR2025-192 ADU R
2/11/2025
1 1 1 NONE No No No Pending Ministerial
8293011021 1439 Indian Wells PR2025-177 ADU R 2/6/2025 1 1 1 NONE No No No Approved Ministerial 8292002004 21306 Tambo PR2025-144 ADU R 1/30/2025 1 1 1 NONE No No No Approved Ministerial 8292005008 1969 Evergreen Springs PR2025-86 ADU R
1/16/2025
1 1 1 NONE No No No Approved Ministerial
8762030037 20311 Flintgate PR2025-78 ADU R 1/15/2025 1 1 1 NONE No No No Approved Ministerial JADU 8704048002 24216 High Knob PR2025-024 ADU R 1/7/2025 1 1 1 NONE No No No Approved Ministerial Table A
1 5
Project Identifier Unit Types Density Bonus Law
Applications
11 Housing Development Applications Submitted
Proposed Units - Affordability by Household Incomes

Jurisdiction Diamond Bar ANNUAL ELEMENT PROGRESS REPORT Reporting
Year 2025 (Jan. 1 - Dec. 31) Housing Element Implementation Planning
Period 6th Cycle 10/15/2021 - 10/15/2029
Table A2
2 3 5 6
Prior APN+ Current APN Street Address Project
Name+
Local Jurisdiction
Tracking ID
Unit Category
(SFA,SFD,2 to
4,5+,ADU,MH)
Tenure
R=Renter
O=Owner
Acutely LowIncome Deed
Restricted
Acutely LowIncome Non
Deed
Restricted
Extremely
Low- Income
Deed
Restricted
Extremely
Low- Income
Non Deed
Restricted
Very LowIncome Deed
Restricted
Very LowIncome Non
Deed
Restricted
Low- Income
Deed
Restricted
Low- Income
Non Deed
Restricted
ModerateIncome
Deed
Restricted
ModerateIncome Non
Deed
Restricted
Above
ModerateIncome
Entitlement
Date
Approved
# of Units
issued
Entitlements
Summary Row: Start Data Entry Below 0 0 0 0 4 0 0 0 4 0 39 47 8713035016 2521 Indian Creek PL2024-65 SFD O 1 7/8/2025 1 8713038018 2725 Clear Creek PL2022-74 SFD O 1 3/25/2025 1 8713040029 2234 Indian Creek PL2024-82 SFD O 1 8/12/2025 1 8292009138
2235 S Diamond Bar PL2022-89
5+ R
4 4 36
1/16/2025 44
8713028038 22702 Timbertop PR20240000397 ADU R 0
8292026019 1724 Morning Canyon PR20240000071 ADU R 0
8717007006 425 Camaritas PR20240000988 ADU R 0
8292004027 21452 Broken Arrow PR20240000605 ADU R 0
8704050003 24339 Seagreen PR20240000153 ADU R 0
8293039042 1548 Kiowa Crest PR20240000043 ADU R 0
8717029061 23042 Rio Lobos PR20240001166 ADU R 0
8293011063 22508 Cello PR20250000766 ADU R 0
8718001009 612 Groom PR20240001285 ADU R 0
8285002012 2523 Sunbright PR20240001351 ADU R 0
8718021005 22702 Eaglespur PR20230001431 ADU R 0
8281035057 530 Bellows PR20240000776 ADU R 0
8762030037 20311 Flintgate PR20250000078 ADU R 0
8292020005 1731 Leaning Pine PR20230000278 ADU R 0
8292012026 1856 Morning Canyon PR20250001063 ADU R 0
8285011008 2558 Castle Rock PR20240000929 ADU R 0
8701026036 23505 Grand Rim PR20250000516 ADU R 0
8765022008 20757 Rim Lane PR20250000406 ADU R 0
8704055018 24218 Gingerwood PR20257000014 ADU R 0
8285027018 21002 Bandana PR20250000930 ADU R 0
8293035021 22566 Birds Eye PR20250000344 ADU R 0
8285025013 21233 Trigger PR20240000480 ADU R 0
8293011021 1439 Indian Wells PR20250000177 ADU R 0
8704053015 865 Featherwood PR20250000201 ADU R 0
8292005008 1969 Evergreen
Springs PR20250000086 ADU R
0 8281032075 509 Armitos PR20250000531 ADU R 0
8293007031 1329 Desert Willow PR20250000546 ADU R 0
8292020051 1732 Roundtree PR20250000590 ADU R 0
8285024022 2939 Crooked Creek PR20240000609 ADU R 0
8706006017 940 Del Sol PR20240001068 ADU R 0
1 Unit Types Affordability by Household Incomes - Completed Entitlement 4 Project Identifier
Annual Building Activity Report Summary - New Construction, Entitled, Permits and Completed Units

Jurisdiction Diamond Bar ANNUAL ELEMENT PROGRESS REPORT Reporting
Year 2025 (Jan. 1 - Dec. 31) Housing Element Implementation Planning
Period 6th Cycle 10/15/2021 - 10/15/2029
8292022005 1905 Los Cerros PR20240001204 ADU R
0 8281006011 563 Bregante PR20240001391 ADU R
0 8703007024 24105 Willow Creek PR20240001469 ADU R
0 8281039038 667 Armitos PR20240000219 ADU R
0 8717018033 23430 Mane PR20240001020 ADU R
0 8285011008 2558 Castle Rock PR20250000845 ADU R
0 8285024010 3016 Castle Rock PR20240000552 ADU R
0 8704050005 24343 Seagreen PR20250000442 ADU R
0 8701030016 23715 Little Quail PR20250001010 ADU R
0 8718027016 466 Rock River PR20250000260 ADU R
0 8293034034 1375 Deep Lawn PR20250000712 ADU R
0 8281033073 476 Wayside PR20250000738 ADU R
0 8714013001 3443 Crooked Creek PR20250000743 ADU R
0 8706010015 1107 Clouds Rest PR20240001645 ADU R
0 8292002004 21306 Tambo PR20250000144 ADU R
0 8704050004 24341 Seagreen PR20250000499 ADU R
0 8292018033 1727 Morning Canyon PR20250000294 ADU R
0 8281037078 633 Foxhaven PR20240001004 ADU R
0 8701023003 23588 Jubilee PR20240001305 ADU R
0 8760017016 860 Adamsgrove PR20240001370 ADU R
0 8285002013 2529 Sunbright PR20240000494 ADU R
0 8281002029 340 Fern PR20240001473 SFD O
0 8713006005 2315 Alamo Heights PR20180034103 SFD O
0 8713026008 2626 Wagon Train PR20230001834 SFD O
0 8718009023 151 Rock River N PR20220002181 ADU R
0 8292018013 1842 Leaning Pine PR20220002186 ADU R
0 8706009037 1162 Twin Canyon PR20230000338 ADU R
0 8760016020 20733 Moonlake PR20230000722 ADU R
0 8760016020 20733 Moonlake PR20230000722 ADU R
8292002005 21300 Tambo PR20230000767 ADU R
0 8718007028 22942 Sunset Crossing PR20230000965 ADU R
0 8281012041 324 San Leandro PR20230001638 ADU R
0 8714024012 3528 Hawkwood PR20230001674 ADU R
0 8281016014 23812 Meadow Falls PR20230001691 ADU R
0 8762028006 1239 Ahtena PR20230001924 ADU R
0 8281031050 24302 Darrin PR20230002065 ADU R
0 8703015022 332 Platina PR20240000032 ADU R
0 8281040058 632 Pantera PR20240000122 ADU R
0 8763024010 1449 Fairlance PR20220001728 ADU R
0 8760019019 20948 Moonlake PR20220001998 ADU R
0 8718007020 22820 Sunset Crossing PR20240000619 ADU R
0 8718022005 131 Pintado PR20240001197 ADU R
0 8281045051 23662 Meadcliff PR20240000699 ADU R
0 8718021007 22710 Eaglespur PR20220002089 ADU R
0 8718021007 22710 Eaglespur PR20220002089 ADU R
8281002033 337 Armitos PR20240000336 ADU R
0 8285025008 21250 Cold Spring PR20230001634 ADU R
0 8281043034 603 Sky PR20240000607 ADU R
0



 



 









 








  
 








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Streamlining Historic Sites Infill
Housing without
Financial Assistance
or Deed Restrictions
Term of
Affordability or
Deed Restriction
Notes
13 14 15 16 17 18 19 20 21 22 23 24 25
Please select the
state
streamlining
provision the
project was

APPROVED
pursuant to.
(may select
multiple)
Is this project
located on a site
with an
associated
historical
designation as
outlined in
Government
Code Section
65400(a)(2)(N)
and reported on
Table L?
Infill Units?
Y/N+
Assistance
Programs for Each
Development
(may select
multiple - see
instructions)
Deed Restriction
Type
(may select
multiple - see
instructions)
For units affordable
without financial
assistance or deed
restrictions, explain how
the locality determined
the units were
affordable
(see instructions)
Term of Affordability
or Deed Restriction
(years) (if affordable
in perpetuity enter
1000)+
Number of
Demolished/Dest
royed Units
Demolished
or Destroyed
Units
Demolished/
Destroyed
Units
Owner or
Renter
Total Density Bonus
Applied to the Project
(Percentage Increase in
Total Allowable Units or
Total Maximum Allowable
Residential Gross Floor
Area)
Number of Other
Incentives,
Concessions,
Waivers, or Other
Modifications Given
to the Project
(Excluding Parking
Waivers or Parking
Reductions)
List the
incentives,
concessions,
waivers, and
modifications
(Excluding
Parking Waivers
or Parking
Modifications)
Did the project
receive a reduction or
waiver of parking
standards? (Y/N)
Notes
+
2 NONE No Y
NONE No Y
NONE No Y
NONE No Y Other DB 55 100.0%
5 Development
Standards
Modification
Yes
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Density Bonus Housing with Financial Assistance
and/or Deed Restrictions Demolished/Destroyed Units

NONE No Y Affordability calculator
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NONE No Y 1 Demolished O
NONE No Y 1 Demolished O
NONE No Y
NONE No Y Affordability calculator
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Jurisdiction Diamond Bar ANNUAL ELEMENT PROGRESS REPORT Reporting Year 2025 (Jan. 1 - Dec. 31) Housing Element Implementation Planning Period 6th Cycle 10/15/2021 - 10/15/2029
1 Projection
Period 3 4
RHNA Allocation
by Income Level
Projection
Period -
06/30/2021-
10/14/2021
2021 2022 2023 2024 2025 2026 2027 2028 2029
Total Units
to Date (all
years)
Total Remaining
RHNA by
Income Level
Deed Restricted - - - - - - - - - -
Non-Deed Restricted - - - - - 17 - - - -
Deed Restricted - - - - - - - - - -
Non-Deed Restricted - - 11 14 15 - - - - -
Deed Restricted - - - - - - - - - -
Non-Deed Restricted 4 1 5 4 2 4 - - - -
Deed Restricted - - - - - - - - - -
Non-Deed Restricted 3 2 26 12 23 24 - - - -
Deed Restricted - - - - - - - - - -
Non-Deed Restricted - - - 5 1 2 - - - -
Above Moderate 806 1 1 4 6 11 4 - - - - 27 779
2,521
8 4 46 41 52 51 - - - - 202 2,319
Income Level
Very Low
40 -
This table is auto-populated once you enter your jurisdiction name and current year data. Past year information comes from previous APRs.

Please contact HCD if your data is different than the material supplied here 2 Table B
Regional Housing Needs Allocation Progress
Permitted Units Issued by Affordability
767
8 Moderate
844
434
437
90 77
Please note: The APR form can only display data for one planning period. To view progress for a different planning period, you may login to HCD's online APR system, or contact HCD staff at [email protected].

Acutely Low - 17
*For years prior to 2025, data on deed-restricted vs. non-deed restricted Extremely Low-Income units is approximated from whether the projects reported any deed-restricted Very Low-Income Units. If you wish to edit this historical data for accuracy or have any questions about the data, you may login to HCD's online APR system, or contact HCD staff at [email protected].

Total Units
*For jurisdictions that received RHNA determinations for the current cycle prior to the passage of AB 3093 (September 19, 2024):
- You were not allocated Acutely Low-Income and Extremely Low-Income RHNA targets, therefore the allocations in Field 1 are listed as "0" - If you wish to set your own targets in these income categories for informational purposes, contact HCD staff at [email protected]. - All Acutely Low-Income and Extremely Low-Income units reported during the cycle are counted towards Very-Low Income RHNA progress 429
Total RHNA
-
344
Low
*For years prior to 2025, Acutely Low-Income units are reported within the Extremely Low-Income category Please Note: Table B does not currently contain data from Table F or Table F2 for prior years. You may login to the APR system to see Table B that contains this data.

Extremely Low -

1 2 3 4 5 6 7 8 9
Name of Program Objective
Projected
Completion Date in
Housing Element
Applicable
Cycle
Status of
Program
Implementation
Program Implementation Details
Quantified
Outcomes:

Category
Quantified
Outcomes:

Count
Supporting Documents

1. Residential
Neighborhood
Improvement
Program
Continue to implement the code enforcement
program, and direct eligible households to
available rehabilitation assistance to correct
code violations. Provide focused code
enforcement and rehabilitation assistance for 5
to 6 households during the planning period in
neighborhoods evidencing concentrations of
deteriorating units.
2022-2029 6th Cycle Continuous
The City continues to operate the code enforcement program. This program is successful and is being continued. Code enforcement cases have increased in number and complexity due to factors including aging housing stock and the declining financial resources of longtime residents. The code enforcement officers and building inspectors are typically the first public officials to learn which homeowners lack the financial resources to correct property maintenance violations, and in the process, become aware of other deferred maintenance issues. The officers carry copies of the City’s Home Improvement Program (HIP) brochures and inform homeowners potentially in need of assistance that the City offers no-interest, deferred loans for essential home repairs.

Households 18 https://www.diamondbarca.gov/1
65/Home-Improvement-Loans

2. Home Improvement
Program
Improve neighborhoods evidencing deferred
maintenance through property maintenance
and rehab. Provide minor repair and
rehabilitation to 4 units annually.
2022-2029 6th Cycle Continuous
The City allocates at least $100,000 of its annual CDBG award to the Home Improvement Program. The HIP provides zero-interest loans of up to $30,000 to low- and very-low-income homeowners, which do not need to be repaid unless the home is sold or refinanced. There is a waiting list of pre-screened applicants, and HIP loans are processed in the order received.

The HIP Program Policies are highlighted below:
•The maximum loan amount for single-family detached homes increased from $20,000 to $30,000.
•Owner-occupants of condominiums that meet the household income requirements are now eligible for HIP loans for up to $20,000, provided that PLHA funds are available. The maximum loan amount is lower than the cap for single-family detached homes because costlier improvements, such as roof maintenance and exterior repairs, are the responsibility of the condominium HOAs, not the individual homeowners.
•PLHA funds may be used to issue loans to households (both single-family detached and condominium) earning up to 150% of the Area Median Income (AMI) for L.A. County. CDBG funds continue to be restricted to owner-occupied households of single-family detached housing earning no more than 80% of AMI. •A minimum loan amount of $10,000 is now required. Previously, no minimum was specified. Establishing a minimum loan amount encourages homeowners to address more improvements at once, and provides economies of scale with respect to the administrative costs associated with processing loans.

The HIP is successful in improving housing conditions and is being continued at available funding levels.

Households 18 https://www.diamondbarca.gov/1
65/Home-Improvement-Loans

3. Section 8 Rental
Assistance Program
Continue to direct eligible households to the
County Section 8 program. 2022-2029 6th Cycle Continuous This program is beneficial in reducing problems such as overpayment and overcrowding. City continues to coordinate with the County on the Section 8 program. Handouts are available at the public counter and contact information is regularly provided to requestors. The program is being continued.

Other
https://www.diamondbarca.gov/
DocumentCenter/View/12683/S
ection-8-Source-of-Income-Flyer2024-English-and-Spanish

4. Preservation of
Assisted Housing
Preserve 100 percent of the 149 low- and
moderate-income units in The Seasons
Apartments.
2022-2029 6th Cycle Continuous
Diamond Bar contains only one assisted housing project, the 149-unit Seasons Apartments (formerly Heritage Park) for senior citizens. This project was constructed in 1988 and was originally financed under the Los Angeles County Multi-Family Mortgage Revenue Bond program. The project was refinanced in November 1999 under the California Community Development Authority's MultiFamily Housing Re-funding Bond, and was transferred to the Corporate Fund for Housing, a non-profit organization. According to the terms of the new bond agreement, income restrictions for residents and corresponding rent limits were set. For the duration of the bond, which expires December 2, 2034, all units will be affordable: 30 units (20%) will be very-low-income, 82 units (55%) will be lowincome, and 37 units will be moderate-income (defined as 100% AMI). All units will be preserved.

Units 149 None
Housing Programs Progress Report
Describe progress of all programs including local efforts to remove governmental constraints to the maintenance, improvement, and development of housing as identified in the housing element.

Table D
Program Implementation Status pursuant to GC Section 65583

5. Mobile Home Park
Preservation
Continue to support preservation of the City's
two mobile home parks as important affordable
housing resources.
2022-2029 6th Cycle Continuous
Zoning for mobile home parks is successful in preserving this affordable housing option and is being continued. No proposals to close the parks were submitted.

The City will continue to support preservation of its two mobile home parks as important affordable housing resources.

Other 2 None

6. First-time
Homebuyer
Assistance Programs
Advertise County's Home Ownership Program
(HOP) and Mortgage Credit Certificate (MCC)
and provide information to interested
homebuyers. In addition, the City will work with
realtors to make them aware of these
programs.
2022-2029 6th Cycle Continuous
The City advertised these programs on the City website and will provide information to interested homebuyers annually via City newsletters and through social media. In addition, the City will work with realtors to make them aware of these programs.

Other https://www.diamondbarca.gov/1
099/Housing-Resources

7. Senior and
Workforce Housing
Development
Identify and evaluate sites suitable for new
senior and workforce housing. The City will
post information on the City website during the
first year of the planning period regarding the
City's interest in assisting in the development of
senior and workforce housing, provide
information on available regulatory and
financial incentives, and assist developers in
applying for funds. The City will also contact
local colleges and universities annually to
identify potential partnership opportunities for
affordable housing.
2022-2029 6th Cycle In Progress
This program is intended to encourage affordable housing development and is being continued. The City is a member of the San Gabriel Valley Regional Housing Trust (SGVRHT), which is a joint powers authority. SGVRHT’s focus is primarily on providing funding assistance in the planning and construction of new homeless and affordable housing. The Trust provides funding and loans to help bridge funding gaps for affordable housing projects. Land Use Policies 10 and 28, which were adopted in the 2019 General Plan Update, also encourage the production of senior and workforce housing.

Units https://www.sgvrht.org/

8. Land Use Element
and Zoning
Maintain adequate sites for housing
development at all income levels in
conformance with the RHNA and ensure
compliance with No Net Loss requirements.

Process Development Code amendments to
provide adequate sites to accommodate the
RHNA. Update all regulations and fees on the
City website annually throughout the planning
period. Notify water and sewer providers
immediately upon adoption of the Housing
Element.

October 2024 6th Cycle Completed
The City has maintained adequate sites for housing development at all income levels and ensure compliance with No Net Loss requirements. In May 2022, the City entered into a Consultant Services Agreement with Torti Gallas + Partners to prepare the Town Center Specific Plan (TCSP) in the Town Center Mixed-Use focus area, which is one of the sites to accommodate the RHNA. Continual progress has been made on the Specific Plan during the planning period. The 45- day public review period for the Supplemental SIR was August 25 through October 10, 2025. On February 10, 2026, the Planning Commission recommended approval of the specific plan to the City Council, and the City Council approved the first reading at its March 3, 2026 hearing.

On February 4, 2025, the City rezoned the General Plan’s three Mixed-Use designations (Town Center Mixed-Use, Neighborhood Mixed-Use and TransitOriented Mixed-Use focus areas) to allow residential development at a minimum density of 20 dwelling units per acre and a maximum density of at least 30 dwelling units per acre.

On November 15, 2022, the City notified the water and sewer providers immediately upon adoption of the Housing Element.

Other
https://www.diamondbarca.gov/1
065/Town-Center-Specific-Plan
https://diamondbarca.portal.civic
clerk.com/event/190/files/agend
a/182

9. Mixed Use
Development
Prepare handout and marketing materials
encouraging mixed-use development where
appropriate and make it available to interested
developers throughout the planning period.
2022-2029 6th Cycle In Progress
In December 2019, the City adopted the Comprehensive General Plan Update that created community visions and blueprint for growth and development in the City through 2040. One of the key features of the new General Plan was the establishment of three new Focus Areas where substantial land use changes are planned as part of a strategy to provide walkable mixed-use activity centers.

Goals and policies to promote mixed use developments are as follows: Land Use Goals 12, 14, 15, 16, 18, 19, 22, 24, 26, Land Use Policies 15, 16, 21, 23, 27, 28, 29, 35, 45; Community Character and Placemaking Goals 7, 8, 14, 17; and Circulation Goal 4.

In May 2022, the City entered into a Consultant Services Agreement with Torti Gallas + Partners to prepare the Town Center Specific Plan in the Town Center Mixed-Use focus area. The TCSP will provide the regulatory and urban design framework to establish a downtown, or “Town Center” in Diamond Bar as a walkable place with entertainment, retail, restaurants, community gathering spaces, and urban housing opportunities. This program is an important component of the City’s overall strategy to revitalize older areas and expand housing production. The 45-day public review period for the Supplemental SIR was August 25 through October 10, 2025. On February 10, 2026, the Planning Commission recommended approval to the City Council, and is tentatively scheduled for the March 3, 2026 City Council hearing.

See Land Use Chapter Goal LU-G-4 and Policy CC-P-21.

Other https://www.diamondbarca.gov/1
065/Town-Center-Specific-Plan

10. Accessory
Dwelling Units
Continue to encourage construction of ADUs
through an informational handout available at
City Hall and on the City website throughout
the planning period.
2022-2029 6th Cycle In Progress
In 2017, the City approved an amendment to the municipal code pertaining to accessory dwelling units to satisfy all of the requirements of Government Code §§65852.150-65852.2. Per AB 68 (Ting), AB 587 (Friedman), AB 671 (Friedman), AB 881 (Bloom), SB 13 (Wieckowski) that went into effect January 1, 2020. In 2021 the City adopted a subsequent amendment to ADU regulations in accordance with the new State laws. On July 16, 2024, the City adopted another Development Code Amendment for consistency with the most recent passages of AB 2221 (Quirk-Silva) and SB 897 (Wieckowski). The updated ADU Ordinances have been effective in supporting the production of ADUs and provides affordable rents to low- and moderate-income households. An ADU handout has been created which is being distributed at the public counter. The City continues to encourage accessory dwelling units and this program is being continued.
51 building permits for ADUs totaling 38,407 square feet were issued.

The City is in the early testing phase of its Pre-Approved Accessory Dwelling Unit (ADU) Program, known as DBADU, which supports the City’s General Plan housing goals by streamlining ADU development and expanding housing opportunities. The program is implemented pursuant to State ADU law, including Government Code Sections 65852.2 and 65852.22, which require ministerial approval of ADUs that comply with objective standards and encourage jurisdictions to reduce regulatory barriers to ADU construction. The DBADU program allows qualified design professionals to submit ADU plans for City review and pre-approval, with the intent of creating a catalog of code-compliant designs that homeowners may use to reduce permitting time and uncertainty. To support implementation, City staff has developed a dedicated program website and application materials, and the City is currently piloting the program with a selected firm to test workflows and review procedures before opening participation to additional professionals and releasing pre-approved plans for broader public use. The DBADU is set to be open to the public in early 2026.

Other
https://library.municode.com/ca/
diamond_bar/codes/code_of_or
dinances?nodeId=CICO_TIT22
DECO_ARTIIISIPLGEDEST_CH

22.42STSPLAUS_S22.42.120A

CDWUNJUACDWUN
https://www.diamondbarca.gov/1
201/Pre-Approved-AccessoryDwelling-Unit-DBA

11. Housing for
Persons with Special
Needs
Continue to facilitate emergency shelters and
transitional/ supportive housing and continue
participating with LAHSA and SGVCOG on
efforts to address homelessness throughout
the planning period. Process an amendment to
the Development Code to allow supportive
housing, low barrier navigation centers and
large residential care facilities consistent with
State law.
2022-2029 6th Cycle Completed
On July 16, 2024, the City adopted a Development Code Amendment to allow supportive housing and low barrier navigation centers consistent with State law and to replace or modify the CUP requirement to provide greater objectivity and development certainty for residential care facilities serving seven or more persons in all residential zones.

Other
https://library.municode.com/ca/
diamond_bar/codes/code_of_or
dinances?nodeId=CICO_TIT22
DECO_ARTIIZODIALLAUS

12. Affordable
Housing Incentives/
Density Bonus
Amend the Development Code in 2021
consistent with current Density Bonus Law and
continue to encourage the production of
affordable housing through the use of density
bonus and other incentives.
2021-2022 6th Cycle Continuous
This program is being continued in compliance with recent changes to State density bonus law. City staff discusses opportunities for affordable housing and density bonuses with developers for housing projects. As mentioned above, an inclusionary housing requirement is also being considered for the TCSP, in addition to other incentives to increase density. The density bonus program is among several tools the City utilizes to facilitate affordable housing. On July 16, 2024, the City adopted a Development Code Amendment to be in conformance with current Density Bonus Law.

The City is also a member of the San Gabriel Valley Regional Housing Trust (SGVRHT), which is a joint powers authority. SGVRHT’s focus is primarily on providing fundings assistance in the planning and construction of new homeless and affordable housing. The Trust provides funding and loans to help bridge funding gaps for affordable housing projects.

Other
https://library.municode.com/ca/
diamond_bar/codes/code_of_or
dinances?nodeId=CICO_TIT22
DECO_ARTIIISIPLGEDEST_CH

22.18SPPRAPHODEPR_S22.1

8.010AFHOINDEBOPR

13. Efficient Project
Processing
Continue to offer streamlined development
processing, and periodically review
departmental processing procedures to ensure
efficient project processing.

October 2024 6th Cycle In Progress
The City continues to offer efficient permit processing. As a small city, staff is able to work closely with applicants through the review and approval process, thereby helping to expedite the entitlement process to issuance of building and zoning permits. In addition, the City has several procedures in place to minimize project review times, which include concurrent processing, pre-application reviews, and recently adopted General Plan EIR, which allows for individual projects that fall within the scope of the EIR to utilize this as environmental clearance under CEQA.

Practices to streamline the issuances for residential projects such as room additions and ADUs have been implemented to eliminate the need to submit a separate application for Planning prior to applying for building permits. The pandemic accelerated implementation of online permit services, and by June 2020, applicants were able to submit applications, plans and payments entirely online. In 2023, the City embarked on the implementation of a new permitting software (Enterprise Land Management system), which will eventually streamline City processes and project processing and expected to go live by July 2026. This program will be further enhanced through revisions to the Development Code.

Units Forthcoming

14. Affirmatively
Furthering Fair
Housing
Explore and pursue alternative land use
strategies and make necessary amendments
to zoning and other land use documents to
facilitate a variety of housing choices, including
but not limited to higher density opportunities
on religious, institutional and quasi-institutional
lands, missing middle zoning in addition to SB9
such as SB10, adaptive reuse, more than one
JADU per structure, acquiring and adding
affordability to existing structures and upzoning
with the goal of 50 housing opportunities in the
planning period.
2022-2029 6th Cycle In Progress
On December 21, 2021, the City adopted an urgency ordinance to expand the housing supply in single-family zones by allowing for lot splits and duplexes under the parameters of SB 9. The permanent ordinance is anticipated for Planning Commission hearing in the Fall of 2026.

The City continues to distribute fair housing information at the public counter through brochures, and refers fair housing related complaints to the Housing Rights Center.

Units
https://diamondbarca.iqm2.com/
Citizens/FileOpen.aspx?Type=1
&ID=1642&Inline=True

15. Reasonable
Accommodation for
Persons with
Disabilities
Continue to implement reasonable
accommodation procedures for persons with
disabilities in compliance with SB 520.
2022 6th Cycle In Progress
The City supports the provision of housing for disabled persons through zoning opportunities for transitional housing, reasonable accommodation procedures, and programs to facilitate affordable housing. In 2010, the City adopted an ordinance to facilitate reasonable accommodations. This program is an important component of the City’s overall efforts to address the special housing needs of persons with disabilities and is being continued and revised to include additional amendments to City regulations to incorporate recent changes to State law.

The City is currently processing a Development Code Amendment to ensure that reasonable housing accommodation procedures do not inadvertently act as a constraint on persons with disabilities. The Code Amendment is anticipated for Planning Commission hearing in the Fall of 2026.

Households
https://library.municode.com/ca/
diamond_bar/codes/code_of_or
dinances?nodeId=CICO_TIT22
DECO_ARTIPUAPDECO_CH22
.02DELAUSAPRE_S22.02.060
REAC

Agenda Item #: 8.8
Meeting Date: March 17, 2026

CITY COUNCIL AGENDA REPORT
TO: Honorable Mayor and Members of the City Council
FROM: Daniel Fox, City Manager
SUBJECT: Agreement with RHA Landscape Architects-Planners, Inc. to provide Landscaping Design Services in Landscape Assessment District Nos. 39-2022 and 41-2021.

STRATEGIC GOAL: Responsible Stewardship of Public Resources RECOMMENDATION:

Approve, and authorize the City Manager to sign the Consulting Services Agreement with RHA Landscape Architects-Planners, Inc. (RHA), in a not-to-exceed amount of $76,690 for landscaping design services in Landscape Assessment District Nos. 39-2022 and 41-2021.

FINANCIAL IMPACT:

The not-to-exceed amount of the Agreement is $76,690. Sufficient funds are included in the Fiscal Year 2025/26 Capital Improvement Program Budget (Project No. PW261) to cover the cost of such services.

The table below shows the project's approved budget and the proposed allocation for the consultant design services for each district.

Item District No. 39-2022 District No. 41-2021 Total
CIP PW261 (Approved Budget) $400,000 $200,000 $600,000
Design Services ($51,380) ($25,310) ($76,690)
Remaining Budget $348,620 $174,690 $523,310
The remaining project budget will be reserved for future landscape and irrigation improvements within the districts, which will be implemented in phases based on the recommendations developed through this Project and available funding.

BACKGROUND:

Agenda Item #: 8.8
Meeting Date: March 17, 2026
Prior to the City’s incorporation in 1989, Landscape Assessment District Nos. 39 and 41 were formed concurrently with residential tract developments to maintain common landscaped areas and mitigate fire hazards through brush clearance within district boundaries. Residents within each district fund landscape maintenance through annual assessments. In return, designated sections of private property are maintained by the City using district funds.

As the administrator of the landscape assessment districts, the City of Diamond Bar manages the annual maintenance programs for each district. In 2021 and 2022, the two assessment districts were reformed to reduce City subsidies and ensure that residents pay their proportional share of maintenance costs. As part of the reformation process, the annual levy structure allows the City to build reserves to support future improvements to landscape infrastructure, provided that annual maintenance costs do not exceed district revenues.

Landscape Assessment District Nos. 39-2022 and 41-2021 currently have sufficient reserve funding to support a consultant evaluation of existing landscape and irrigation system conditions and to develop a long-term strategy for improvements that, over time, would support water-cost savings and more drought-tolerant native plants. The City Council approved inclusion of this Project in the Fiscal Year 2025/26 Capital Improvement Program.

Landscape Assessment District No. 39-2022 is located along the eastern city limit, generally accessible from Grand Avenue, with primary streets including Summitridge Drive and Longview Drive. Landscape Assessment District No. 41-2021 is located near Ronald Reagan Park, generally accessible from Pathfinder Road, with primary streets including Canyon Ridge Road and Peaceful Hills Road.

Both districts feature trees, shrubs, and manufactured slopes that require routine fire brush clearance as part of the City's ongoing maintenance responsibilities. Landscape Assessment District No. 39-2022 also includes pocket parks maintained using district funds. Existing landscape conditions vary across the districts, with many areas consisting of native vegetation or remaining largely unimproved since original development.

Additionally, most irrigation systems were installed at the time of development and may no longer be functional or adequate for current needs.

ANALYSIS:

On November 25, 2025, the City released a Request for Proposals (RFP) for Landscape Assessment and Improvement Planning for Landscape Assessment District Nos. 39-2022 and 41-2021 through the City’s online bidding platform, PlanetBids. Upon closure of the RFP, four (4) responsive proposals were received. # Firm Name Proposal Base Cost Optional Task Total Cost 1 RHA $47,510 $29,180 $76,690
2 Conceptual Design +
Planning Company
$98,000 $29,000 $127,000
3 DVDCreative (DVDC) $95,150 $103,200 $198,350
4 PlaceWorks $209,173 $72,190 $281,363
Staff evaluated all responsive proposals using qualitative criteria including technical approach, project team qualifications, relevant experience, and demonstrated understanding of the City’s landscape management objectives. Proposals were also evaluated based on total proposed fees and the estimated level of effort required to complete the scope of work.

Based on the established evaluation criteria, RHA was identified as the highest-ranked firm. In addition to submitting a competitive proposal, RHA demonstrated relevant experience preparing landscape assessments,

Agenda Item #: 8.8
Meeting Date: March 17, 2026
design standards, and improvement planning documents for public agencies.

RHA has experience providing similar services to other public agencies in Southern California. This background enables the firm to effectively address local agency needs, site conditions, and applicable regulatory considerations. Their regional expertise positions them to deliver high-quality, cost-effective recommendations tailored to the City’s operational and environmental priorities.

For these reasons, staff recommends awarding the Consulting Services Agreement to RHA.

LEGAL REVIEW:

The City Attorney has reviewed and approved the Agreement as to form.

PREPARED BY:

Nicholas Delgado, Management Analyst, Public Works
ATTACHMENTS:

1. Consultant Agreement

2. LAD Maps

1 Professional Services - Design
1614063.1

CONSULTING SERVICES AGREEMENT
Design Professional
THIS AGREEMENT (the "Agreement") is made as of March 17, 2026 by and between the City of Diamond Bar, a municipal corporation ("City") and RHA Landscape Architects-Planners, Inc., a California corporation ("Consultant").

1. Consultant's Services.

Subject to the terms and conditions set forth in this Agreement Consultant shall provide to the reasonable satisfaction of the City the Landscape improvement design services for LLAD39 and LLAD41 set forth in The City's Request for Proposal, dated November 21, 2025 attached Exhibit "A", which is incorporated herein by this reference.

As a material inducement to the City to enter into this Agreement, Consultant represents and warrants that it has thoroughly investigated the work and fully understands the difficulties and restrictions in performing the work. Consultant represents that it is fully qualified to perform such consulting services by virtue of its experience and the training, education and expertise of its principals and employees.

Jason Williams, Maintenance Supervisor (herein referred to as the “City’s Project Manager”), shall be the person to whom the Consultant will report for the performance of services hereunder. It is understood that Consultant shall coordinate its services hereunder with the City’s Project Manager to the extent required by the City’s Project Manager, and that all performances required hereunder by consultant shall be performed to the satisfaction of the City’s Project Manager and the City Manager

2. Term of Agreement. This Agreement shall take effect March 18, 2026, and shall continue until the work herein is completed unless earlier terminated pursuant to the provisions herein.

3. Compensation. City agrees to compensate Consultant for each service which Consultant performs to the satisfaction of City in compliance with the scope of services set forth in The City's Request for Proposal, dated November 21, 2025 as attached Exhibit "A". Payment will be made only after submission of proper invoices in the form specified by City. Total payment to consultant pursuant to this Agreement shall not exceed seventy-six thousand six hundred ninety dollars ($76,690) without the prior written consent of the City. The above not to exceed amount shall include all costs, including, but not limited to, all clerical, administrative, overhead, telephone, travel and all related expenses.

4. Payment.

A. As scheduled services are completed, Consultant shall submit to City an invoice for the services completed, authorized expenses and authorized extra work actually performed or incurred.

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B. All such invoices shall state the basis for the amount invoiced, including services completed, the number of hours spent, and any extra work performed.

C. Payment shall constitute payment in full for all services, authorized costs and authorized extra work covered by that invoice.

5. Change Orders. No payment for extra services caused by a change in the scope or complexity of work, or for any other reason, shall be made unless and until such extra services and a price therefore have been previously authorized in writing and approved by the City Manager or his designee as an amendment to this Agreement.

The amendment shall set forth the changes of work, extension of time, if any, and adjustment of the fee to be paid by City to Consultant.

6. Priority of Documents. In the event of any inconsistency between this Agreement and the attached exhibits, the following order of precedence shall apply: (a) This Agreement; (b) The City's Request for Proposal, dated November 21, 2025 attached Exhibit "A"; and (c) Consultant's Proposal dated January 8, 2026 attached Exhibit "B".

7. Status as Independent Contractor.

A. Consultant is, and shall at all times remain as to City, a wholly independent contractor. Consultant shall have no power to incur any debt, obligation, or liability on behalf of City or otherwise act on behalf of City as an agent. Neither City nor any of its agents shall have control over the conduct of Consultant or any of Consultant's employees, except as set forth in this Agreement. Consultant shall not, at any time, or in any manner, represent that it or any of its agents or employees are in any manner agents or employees of City.

B. Consultant agrees to pay all required taxes on amounts paid to Consultant under this Agreement, and to indemnify and hold City harmless from any and all taxes, assessments, penalties, and interest asserted against City by reason of the independent contractor relationship created by this Agreement. In the event that City is audited by any Federal, State agency, including the Public Employee Retirement System, regarding the independent contractor status of Consultant and the audit in any way fails to sustain the validity of a wholly independent contractor relationship between City and Consultant, its employees or subconsultants, then Consultant agrees to reimburse City for all costs, including accounting and attorney's fees, arising out of such audit and any appeals relating thereto.

C. Consultant shall fully comply with Workers' Compensation laws regarding Consultant and Consultant's employees. Consultant further agrees to indemnify and hold City harmless from any failure of Consultant to comply with applicable Worker's Compensation laws.

Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

3 Professional Services - Design
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D. Consultant shall, at Consultant’s sole cost and expense fully secure and comply with all federal, state and local governmental permit or licensing requirements, including but not limited to a business license with the City of Diamond.

E. In addition to any other remedies it may have, City shall have the right to offset against the amount of any fees due to Consultant under this Agreement any amount due to City from Consultant as a result of Consultant's failure to promptly pay to City any reimbursement or indemnification required by this Agreement or for any amount or penalty levied against the City for Consultant’s failure to comply with this Section.

8. Standard of Performance. Consultant shall perform all work at the standard of care and skill ordinarily exercised by members of the profession under similar conditions and represents that it and any subcontractors it may engage, possess any and all licenses which are required to perform the work contemplated by this Agreement and shall maintain all appropriate licenses during the performance of the work.

9. Indemnification. To the maximum extent permitted by Civil Code section 2782.8, Consultant shall defend, indemnify and hold harmless City, its officers, officials, employees and volunteers ("Indemnitees") from and against all liability, loss, damage, expense, cost (including without limitation reasonable attorneys' fees, expert fees and all other costs and fees of litigation) of every nature arising out of or in connection with:
(1) Any and all claims under Worker’s Compensation acts and other employee benefit acts with respect to Consultant’s employees or Consultant’s contractors; (2) Any and all claims arising out of Consultant's performance of work hereunder or its failure to comply with any of its obligations contained in this Agreement. Should City in its sole discretion find Consultant’s legal counsel unacceptable, then Consultant shall reimburse the City its costs of defense, including without limitation reasonable attorneys' fees, expert fees and all other costs and fees of litigation. The Consultant shall promptly pay any final judgment rendered against the Indemnitees. Except for the Indemnitees, this Agreement shall not be construed to extend to any third-party indemnification rights of any kind; and
(3) Any and all claims for loss, injury to or death of persons or damage to property caused by the negligent professional act or omission in the performance of professional services pursuant to this Agreement.
(4) The Consultant's obligations to indemnify, defend and hold harmless the City shall survive termination of this Agreement.

10. Insurance.

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4 Professional Services - Design
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A. Consultant shall at all times during the term of this Agreement carry, maintain, and keep in full force and effect, with an insurance company authorized to do business in the State of California and approved by the City the following insurance:
(1) a policy or policies of broad-form comprehensive general liability insurance written on an occurrence basis with minimum limits of $1,000,000.00 combined single limit coverage against any injury, death, loss or damage as a result of wrongful or negligent acts by Consultant, its officers, employees, agents, and independent contractors in performance of services under this Agreement; (2) property damage insurance with a minimum limit of $500,000.00 per occurrence;
(3) automotive liability insurance written on an occurrence basis covering all owned, non-owned and hired automobiles, with minimum combined single limits coverage of $1,000,000.00;
(4) Worker's Compensation insurance when required by law, with a minimum limit of $500,000.00 or the amount required by law, whichever is greater; and (5) Professional liability insurance covering errors and omissions arising out of the performance of this Agreement with a combined single limit of $1,000,000. If such insurance is on a claims’ made basis, Consultant agrees to keep such insurance in full force and effect for at least five years after termination or date of completion of this Agreement.

B. The City, its officers, employees, agents, and volunteers shall be named as additional insureds on the policies as to comprehensive general liability, property damage, and automotive liability. The policies as to comprehensive general liability, property damage, and automobile liability shall provide that they are primary, and that any insurance maintained by the City shall be excess insurance only.

C. All insurance policies shall provide that the insurance coverage shall not be non-renewed, canceled, reduced, or otherwise modified (except through the addition of additional insureds to the policy) by the insurance carrier without the insurance carrier giving City ten (10) day's prior written notice thereof. Consultant agrees that it will not cancel, reduce or otherwise modify the insurance coverage and in the event of any of the same by the insurer to immediately notify the City.

D. All policies of insurance shall cover the obligations of Consultant pursuant to the terms of this Agreement and except for professional liability insurance, shall be issued by an insurance company which is authorized to do business in the State of California or which is approved in writing by the City; and shall be placed have a current A.M. Best's rating of no less than A-, VII. In the case of professional liability insurance, such coverage shall be issued by companies either licensed or admitted to conduct business in the State of California so long as such insurers possesses the aforementioned Best's rating.

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E. Consultant shall submit to City (1) insurance certificates indicating compliance with the minimum insurance requirements above, and (2) insurance policy endorsements or a copy of the insurance policy evidencing the additional insured requirements in this Agreement, in a form acceptable to the City.

F. Self-Insured Retention/Deductibles. All policies required by this Agreement shall allow City, as additional insured, to satisfy the self-insured retention (“SIR”) and/or deductible of the policy in lieu of the Consultant (as the named insured) should Consultant fail to pay the SIR or deductible requirements. The amount of the SIR or deductible shall be subject to the approval of the City. Consultant understands and agrees that satisfaction of this requirement is an express condition precedent to the effectiveness of this Agreement. Failure by Consultant as primary insured to pay its SIR or deductible constitutes a material breach of this Agreement. Should City pay the SIR or deductible on Consultant’s due to such failure in order to secure defense and indemnification as an additional insured under the policy, City may include such amounts as damages in any action against Consultant for breach of this Agreement in addition to any other damages incurred by City due to the breach.

G. Subrogation. With respect to any Workers' Compensation Insurance or Employer's Liability Insurance, the insurer shall waive all rights of subrogation and contribution it may have against the Indemnitees.

H. Failure to Maintain Insurance. If Contractor fails to keep the insurance required under this Agreement in full force and effect, City may take out the necessary insurance and any premiums paid, plus 10% administrative overhead, shall be paid by Consultant, which amounts may be deducted from any payments due Consultant.

I. Consultant shall include all subcontractors, if any, as insureds under its policies or shall furnish separate certificates and endorsements for each subcontractor to the City for review and approval. All insurance for subcontractors shall be subject to all of the requirements stated herein.

11. Confidentiality. Consultant in the course of its duties may have access to confidential data of City, private individuals, or employees of the City. Consultant covenants that all data, documents, discussion, or other information developed or received by Consultant or provided for performance of this Agreement are deemed confidential and shall not be disclosed by Consultant without written authorization by City. City shall grant such authorization if disclosure is required by law. All City data shall be returned to City upon the termination of this Agreement. Consultant's covenant under this section shall survive the termination of this Agreement. Notwithstanding the foregoing, to the extent Consultant prepares reports of a proprietary nature specifically for and in connection with certain projects, the City shall not, except with Consultant's prior written consent, use the same for other unrelated projects.

12. Ownership of Materials. Except as specifically provided in this Agreement, all materials provided by Consultant in the performance of this Agreement Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

6 Professional Services - Design
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shall be and remain the property of City without restriction or limitation upon its use or dissemination by City. Consultant may, however, make and retain such copies of said documents and materials as Consultant may desire.

13. Maintenance and Inspection of Records. In accordance with generally accepted accounting principles, Consultant and its subcontractors shall maintain reasonably full and complete books, documents, papers, accounting records, and other information (collectively, the “records”) pertaining to the costs of and completion of services performed under this Agreement. The City and any of their authorized representatives shall have access to and the right to audit and reproduce any of Consultant's records regarding the services provided under this Agreement. Consultant shall maintain all such records for a period of at least three (3) years after termination or completion of this Agreement. Consultant agrees to make available all such records for inspection or audit at its offices during normal business hours and upon three (3) days' notice from the City, and copies thereof shall be furnished if requested.

14. Conflict of Interest.

A. Consultant covenants that it presently has no interest and shall not acquire any interest, direct or indirect, which may be affected by the services to be performed by Consultant under this Agreement, or which would conflict in any manner with the performance of its services hereunder. Consultant further covenants that, in performance of this Agreement, no person having any such interest shall be employed by it. Furthermore, Consultant shall avoid the appearance of having any interest which would conflict in any manner with the performance of its services pursuant to this Agreement.

B. Consultant covenants not to give or receive any compensation, monetary or otherwise, to or from the ultimate vendor(s) of hardware or software to City as a result of the performance of this Agreement. Consultant's covenant under this section shall survive the termination of this Agreement.

15. Termination. The City may terminate this Agreement with or without cause upon fifteen (15) days' written notice to Consultant. The effective date of termination shall be upon the date specified in the notice of termination, or, in the event no date is specified, upon the fifteenth (15th) day following mailing of the notice. In the event of such termination, City agrees to pay Consultant for services satisfactorily rendered prior to the effective date of termination. Immediately upon receiving written notice of termination, Consultant shall discontinue performing services, unless the notice provides otherwise, except those services reasonably necessary to effectuate the termination. The City shall be not liable for any claim of lost profits.

16. Personnel/Designated Person. Consultant represents that it has, or will secure at its own expense, all personnel required to perform the services under this Agreement. All of the services required under this Agreement will be performed by Consultant or under its supervision, and all personnel engaged in the work shall be qualified to perform such services. Except as provided in this Agreement, Consultant Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

7 Professional Services - Design
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reserves the right to determine the assignment of its own employees to the performance of Consultant's services under this Agreement, but City reserves the right in its sole discretion to require Consultant to exclude any employee from performing services on City's premises.

17. Non-Discrimination and Equal Employment Opportunity.

A. Consultant shall not discriminate as to race, color, creed, religion, sex, marital status, national origin, ancestry, age, physical or mental handicap, medical condition, or sexual orientation, in the performance of its services and duties pursuant to this Agreement, and will comply with all rules and regulations of City relating thereto.

Such nondiscrimination shall include but not be limited to the following: employment, upgrading, demotion, transfers, recruitment or recruitment advertising; layoff or termination; rates of pay or other forms of compensation; and selection for training, including apprenticeship.

B. Consultant will, in all solicitations or advertisements for employees placed by or on behalf of Consultant state either that it is an equal opportunity employer or that all qualified applicants will receive consideration for employment without regard to race, color, creed, religion, sex, marital status, national origin, ancestry, age, physical or mental handicap, medical condition, or sexual orientation.

C. Consultant will cause the foregoing provisions to be inserted in all subcontracts for any work covered by this Agreement except contracts or subcontracts for standard commercial supplies or raw materials.

18. Time of Completion. Consultant agrees to commence the work provided for in this Agreement within (5) days of being notified by the City to proceed and to diligently prosecute completion of the work as may otherwise be agreed to by and between the Project Manager and the Consultant.

19. Time Is of the Essence. Time is of the essence in this Agreement.

Consultant shall do all things necessary and incidental to the prosecution of Consultant's work.

20. Delays and Extensions of Time. Consultant's sole remedy for delays outside its control shall be an extension of time. No matter what the cause of the delay, Consultant must document any delay and request an extension of time in writing at the time of the delay to the satisfaction of City. Any extensions granted shall be limited to the length of the delay outside Consultant’s control. If Consultant believes that delays caused by the City will cause it to incur additional costs, it must specify, in writing, why the delay has caused additional costs to be incurred and the exact amount of such cost within 10 days of the time the delay occurs. No additional costs can be paid that exceed the not to exceed amount absent a written amendment to this Agreement. In no event shall the Consultant be entitled to any claim for lost profits due to any delay, whether caused by the City or due to some other cause.

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21. Assignment. Consultant shall not assign or transfer any interest in this Agreement nor the performance of any of Consultant's obligations hereunder, without the prior written consent of City, and any attempt by Consultant to so assign this Agreement or any rights, duties, or obligations arising hereunder shall be void and of no effect.

22. Compliance with Laws. Consultant shall comply with all applicable laws, ordinances, codes and regulations of the federal, state, and local governments.

23. Non-Waiver of Terms, Rights and Remedies. Waiver by either party of any one or more of the conditions of performance under this Agreement shall not be a waiver of any other condition of performance under this Agreement. In no event shall the making by City of any payment to Consultant constitute or be construed as a waiver by City of any breach of covenant, or any default which may then exist on the part of Consultant, and the making of any such payment by City shall in no way impair or prejudice any right or remedy available to City with regard to such breach or default.

24. Attorney's Fees. In the event that either party to this Agreement shall commence any legal or equitable action or proceeding to enforce or interpret the provisions of this Agreement, the prevailing party in such action or proceeding shall be entitled to recover its costs of suit, including reasonable attorney's fees and costs, including costs of expert witnesses and consultants.

25. Mediation. Any dispute or controversy arising under this Agreement, or in connection with any of the terms and conditions hereof, which cannot be resolved by the parties, may be referred by the parties hereto for mediation. A third party, neutral mediation service shall be selected, as agreed upon by the parties and the costs and expenses thereof shall be borne equally by the parties hereto. The parties agree to utilize their good faith efforts to resolve any such dispute or controversy so submitted to mediation. It is specifically understood and agreed by the parties hereto that mutual good faith efforts to resolve the same any dispute or controversy as provided herein, shall be a condition precedent to the institution of any action or proceeding, whether at law or in equity with respect to any such dispute or controversy.

26. Notices. Any notices, bills, invoices, or reports required by this Agreement shall be deemed received on (a) the day of delivery if delivered by hand during regular business hours or by facsimile before or during regular business hours; or (b) on the third business day following deposit in the United States mail, postage prepaid, to the addresses heretofore set forth in the Agreement, or to such other addresses as the parties may, from time to time, designate in writing pursuant to the provisions of this section.
“CONSULTANT” “CITY”
RHA Landscape Architects-Planners, Inc. City of Diamond Bar 6840 Indiana Avenue, Suite 100, 21810 Copley Drive
Riverside, CA 92506 Diamond Bar, CA 91765-4178
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Attn.: Doug Grove, President Attn.:David Liu, Director of Public Works Phone: (951) 781-1930 Phone: (909) 839-7038
E-Mail: [email protected] E-mail: [email protected]

28. Governing Law. This Agreement shall be interpreted, construed and enforced in accordance with the laws of the State of California.

29. Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be deemed to be the original, and all of which together shall constitute one and the same instrument.

30. Entire Agreement. This Agreement, and any other documents incorporated herein by reference, represent the entire and integrated agreement between Consultant and City. This Agreement supersedes all prior oral or written negotiations, representations or agreements. This Agreement may not be amended, nor any provision or breach hereof waived, except in a writing signed by the parties which expressly refers to this Agreement. Amendments on behalf of the City will only be valid if signed by a person duly authorized to do so under the City's Purchasing Ordinance.

IN WITNESS of this Agreement, the parties have executed this Agreement as of the date first written above.
"Consultant" "City"
RHA Landscape Architects-Planners, Inc. CITY OF DIAMOND BAR By: By: ____
Doug Grove, President Dan Fox, City Manager
By: ATTEST:

Doug Grove, Secretary
Kristina Santana, City Clerk
Approved as to form:

By:_________________________
Omar Sandoval, City Attorney
*NOTE: If Consultant is a corporation, the City requires the following signature(s):
--(1) the Chairman of the Board, the President or a Vice President, AND (2) the Secretary, the Chief Financial Officer, the Treasurer, an Assistant Secretary or an Assistant
Treasurer. If only one corporate officer exists or one
corporate officer holds more than one corporate office, please so indicate. OR
--The corporate officer named in a corporate resolution as authorized to enter into this Agreement. A copy of the
corporate resolution, certified by the Secretary close in time to the execution of the Agreement, must be provided to the City.

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2/17/2026

Exhibit A –
The City's Request
for Proposal, dated
November 21, 2025
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DEPARTMENT OF PUBLIC WORKS

CITY OF DIAMOND BAR

CALIFORNIA

REQUEST FOR PROPOSALS
FOR
Landscape Assessment, Design
Standards, and Improvement
Planning for District Nos. 39-2022
and 41-2021
NOVEMBER 2025
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CITY OF DIAMOND BAR

REQUEST FOR PROPOSALS (RFP)
Date: November 21, 2025
Department: Public Works
Project Type: Landscape Assessment, Design Standards, and Improvement Planning for Landscape Assessment District Nos. 39-2022 and 41- 2021.

Proposals Due: January 8, 2026 at 2:00 P.M.

Project Contact: Nicholas Delgado, Management Analyst
(909) 839-7088 / [email protected]

INTRODUCTION
Incorporated on April 18, 1989, the City of Diamond Bar (“City”) sets against a scenic mountain backdrop on more than 8,000 acres (12.5 sq. miles) of rolling hills and valleys in the East San Gabriel Valley region.

Among the amenities that contribute to the high quality of life that is valued by residents are the family-friendly atmosphere; the well-maintained parks, trails, and roads; top-rated school Districts; and the unparalleled public safety services, which contribute to keeping Diamond Bar among the safest communities in the region for the past 35 years.

BACKGROUND
Landscape Assessment District Nos. 39-2022 and 41-2021 are funded through assessments on the residents within each district. As part of the Fiscal Year 2025/26 Capital Improvement Program, the City has allocated funding for this project to evaluate, plan, and develop design standards and improvement strategies for landscapes within both districts.

The primary goal of this study is to provide a comprehensive assessment and phased improvement plan that can guide future landscape enhancements. While construction funding is currently minimal, improvements will be implemented over time in accordance with the phasing and prioritization recommendations developed through this project.

Existing landscape conditions vary across the districts. Many areas consist of native vegetation or remain largely unimproved since the original development. In addition, nearly all irrigation systems were installed at the time of development and may no longer Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

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be functional or adequate for current needs. This project will evaluate these conditions, identify opportunities for improvement, and develop design and irrigation standards compatible with City standards and the surrounding environment.

TO INTERESTED FIRMS
The City of Diamond Bar is inviting qualified licensed landscape architectural firms to submit proposals for Landscape Assessment and Improvement Planning for Landscape Assessment Districts 39-2022 and 41-2021. The purpose of this Request for Proposals (RFP) is to retain a qualified, professional, and responsive firm to evaluate existing landscape conditions, develop design and irrigation standards, identify opportunities for improvement, and prepare a phased improvement plan for each district.

The study will include, but is not limited to, documenting existing conditions, assessing irrigation systems, identifying areas for enhancement, and providing conceptual recommendations to guide future implementation. Deliverables will include detailed reports for each district and GIS shapefiles documenting assessed areas, conditions, project phases, and photographic documentation from the landscape inventory.

The results of this study will inform future landscape improvement projects, which will be implemented in phases consistent with the recommendations developed through this work. This project establishes the framework for prioritized improvements and may offer consultants potential opportunities for continued engagement in later phases.

This contract will be administered by the City’s Public Works Department.

SCOPE OF SERVICES
The selected consultant shall prepare a comprehensive Landscape Assessment, Design Standards, and Improvement Planning Report for Landscape Assessment District Nos. 39-2022 and 41-2021, including, but not limited to, the following tasks:

1. Property Identification
a. Using City-provided data, identify all properties within the district boundaries that are maintained by the City.
b. The City will provide all available records for both districts, including assessment district maps, ownership/maintenance information, and any historical documentation.
i. The consultant is not expected to conduct additional records research beyond reviewing these materials.
c. Document property ownership, current maintenance responsibility, and location details.

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2. Landscape Inventory and Assessment
a. Identify all landscape areas eligible for improvements, including:
i. Slopes on private property within district boundaries. ii. “Pocket parks” in District 39-2022.
iii. Clarification: This assessment excludes all fire brush and trail areas; only the slopes and mini-parks shall be evaluated.
b. Document existing conditions for each area, including:
i. Irrigation access.
ii. Existing trees and vegetation types.
iii. Plant species and health.
iv. Soil and grading conditions.
v. Other relevant site features.
vi. Photographic documentation capturing representative conditions, notable features, and issues.

3. Design Standards Development
a. Develop design standards for slopes, including:
i. Trees, shrubs, and other vegetation.
ii. Drought-tolerant and low-maintenance plantings.
iii. Compatibility with City standards and surrounding environment. b. Develop irrigation design standards for:
i. New installations.
ii. Upgrades to existing systems.
iii. Replacement or rehabilitation of existing irrigation infrastructure.

4. Project Phasing
a. Group areas into logical “project phases” for implementation, separately for each district.
b. Prepare an order-of-magnitude cost estimate for each phase based on:
i. Estimated construction and maintenance costs.
ii. Necessity factors such as fire hazard risk, erosion control, or public safety concerns.
iii. Other relevant considerations.

5. Deliverables for each District
a. Comprehensive Report
i. Property and landscape inventory.
ii. Existing conditions, including photographic documentation of all areas captured during the landscape inventory.
iii. Design standards for vegetation and irrigation.
iv. Project phasing and order-of-magnitude cost estimates.

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OPTIONAL TASKS
The following tasks are not mandatory for the base scope of work but should be addressed as optional services the consultant is capable of providing and may be authorized by the City at its discretion:

A. Community Engagement and Public Input
• Conduct public workshops or surveys to gather input on desired landscape improvements.
• Incorporate community priorities into design standards and project phasing.

B. City Council Presentation
• Participate in one City Council meeting to present project findings, assessment results, and conceptual improvement recommendations prior to final design
C. Maintenance & Lifecycle Cost Assessment
• Provide estimated long-term maintenance costs for proposed improvements.
• Recommend maintenance practices or schedules for new plantings and irrigation systems.

D. Graphic Renderings of Proposed Landscape Treatments
• Prepare graphic renderings or visual simulations illustrating proposed landscape design concepts, including representative slope treatments, planting palettes, and irrigation improvements.
• Provide at least one “typical slope” rendering depicting how recommended plant species, densities, and design standards would appear once implemented.

E. GIS Shapefiles or Geodatabase
• Prepare GIS shapefiles or a geodatabase compatible with ArcGIS, including clearly attributed fields for project-specific areas assessed, project phases, landscape features, and site conditions.
• Include locations of photographs taken during the landscape inventory, with linked image files or descriptive attributes.
• Ensure GIS data is organized and documented so it can be readily used for planning, analysis, and future updates.

PROPOSAL CONTENT AND FORMAT

1. PROJECT TEAM: Please provide an organizational chart indicating principles and key project team members. Also, provide resumes of the key personnel involved Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

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with this contract including personnel from sub-consultants (if any). Identify the experience of the personnel assigned and briefly outline the responsibilities of each member. If any changes in personnel occur during the contract period, the consultant shall notify the City and furnish the same required information.

2. FIRM’S EXPERIENCE/REFERENCES: List three (3) public agencies where similar services are being provided. Provide the following information: agency name, project manager's name, and services provided.

3. PROJECT UNDERSTANDING: Describe the approach and methods that will be used to complete the work described in the scope of services. Provide enough detail to distinguish the various work required for each task. Also, identify any potential concerns or problems that your firm anticipates during the term of this contract.

4. SCHEDULE: Provide a proposed schedule to accomplish all of the required tasks.

Be sure to include time for City review/approval milestones.

5. FEE PROPOSAL: Provide a “not-to-exceed” for each year to provide the required scope of services, and state the assumptions on which the estimates are based.

Also, provide the hourly rates of all personnel assigned to the contract. These rates may be used to negotiate additional design work at the City’s request.

6. AGREEMENT: Attachment 1 is a copy of the City’s Consultant Services Agreement. A statement must be made in the proposal that all terms and conditions are acceptable. No exceptions to this agreement are allowed.

GENERAL TERMS AND CONDITIONS

1. Issuance of this Request for Proposals (RFP) and receipt of proposals does not commit the City to award an agreement. The City expressly reserves the right to postpone the bid opening date for its own convenience, to accept or reject any or all bids received in response to this RFP, to negotiate with more than one vendor concurrently, or to cancel all or part of this RFP.

2. The City reserves the right to reduce or revise elements of the scope of work prior to the award of any agreement. Furthermore, the City reserves the right to reject any or all proposals submitted; and no representation is made hereby that any agreement will be awarded pursuant to this Request for Proposals, or otherwise.

All costs incurred in the preparation of the proposal, in the submission of additional information and/or in any other aspect of a proposal prior to the award of a written agreement will be borne by the bidder.

3. Proposals shall be submitted on the forms supplied by the City of Diamond Bar and contained herein.

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4. All proposals, bids, and quotes must be typewritten or written in ink. No erasures will be permitted. Mistakes may be crossed out and corrections made adjacent.

Corrections must be initialed by the person signing the bid.

5. Proposals submitted may be withdrawn by written or email request received by the City before the hour set for opening. After such hour, it may not be withdrawn.

6. The City reserves the right to reject any or all proposals and to waive any informality or technical defect in a proposal.

7. All proposals must be signed by a responsible officer or authorized employee of the firm, giving the firm’s name and address. Obligations assumed by such signature must be fulfilled.

8. Submissions of a signed bid will be interpreted to mean that the bidder has thereby agreed to all of the terms and conditions set forth in the bid package.

9. CONTRACT PERIOD: The term of the contract will be until the completion of all services rendered.

10. INVITATION FOR INTERVIEW (OPTIONAL): Firm(s) selected for further consideration for all or parts of the tasks in the scope of work may be contacted to arrange for an interview with City Staff via a virtual meeting platform. Should a firm be asked to participate in the interview, the principal and personnel assigned to the City should be available to discuss the following:
• Major elements of the proposal; and be prepared to answer any questions raised to clarify in detail, and
• Satisfactory performance on similar past/current work and description of previously/current related experience for assigned personnel.

11. SELECTION PROCEDURE: Criteria for evaluation of proposals may include, but need not be limited to, the following:
• Responsiveness and comprehensiveness of proposal.
• Firms and assigned personnels’ experience with the City of Diamond Bar and other public agencies.
• Quality of previous work performed by the firm.
• Resources and fees required to perform the requested services. • The firm’s comments on the consulting services agreement. • References.

12. RIGHT TO REJECT ALL PROPOSALS: The City reserves the right to reduce or revise elements of the scope of work prior to the award of a contract. Furthermore, the City reserves the right to reject any proposal and may elect to make a decision without further discussion or negotiation. This solicitation is not to be construed as a contract of any kind. The City is not liable for any costs or expenses incurred in Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

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the preparation of the proposals. The right to issue supplementary information or guidelines relating to this request is also reserved by the City. All proposals submitted to the City in response to this RFP shall become property of the City.

13. FEE PROPOSAL: A fee proposal shall be submitted separately, including a detailed schedule with all proposed staff, the hours each person will devote to a given task, and all reimbursable services to complete work described in the proposed Scope of Service. The fee proposal(s) shall be uploaded on PlanetBids separately bearing the name, address, and telephone number of the individual or entity submitting the proposal.

14. INSURANCE: Proof of insurance requirements addressed in the professional services agreement of this Request for Proposal shall be submitted by the selected Consultant upon execution of the contract for submittal to the City Council.

The selected Consultant must submit a "Statement Certifying Insurance Coverage" certifying that the required insurance coverage will be obtained by the Consultant, and that the Consultant understands said coverage is prerequisite for entering into an agreement with the City. The Consultant is required to confirm with its insurance carrier that it can meet all the requirements for insurance. Failure to meet the insurance regulations as set forth shall result in the Consultant's disqualification.

15. AGREEMENT: A copy of the City’s consultant services agreement can be found as Attachment 1. A statement SHALL be made in the proposal that all terms and conditions including insurance requirements are acceptable.

ATTACHMENTS SCHEDULE
• ATTACHMENT 1 Sample Contract Agreement
• ATTACHMENT 2 Boundary Maps for LADs

RFP SCHEDULE
• November 21, 2025 Release of RFP
• January 8, 2026 Proposals Due to the City
• January 13-15, 2026 Invitation for Interview (Optional) • February 2026 Award of Contract

SUBMITTAL OF PROPOSALS
An electronic copy of the proposal, in PDF format, shall be uploaded onto PlanetBids on or before two o’clock (2:00) P.M. on Thursday, January 8, 2026. Only electronic proposals will be accepted. Use the link below to register: https://www.diamondbarca.gov/712/RFPRFQ-BID-Opportunities.

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QUESTIONS
Any questions can be posted within the Q&A Section in PlanetBids. Please post all questions no later than 4:00 P.M. on January 2, 2026.

Sincerely,
David G. Liu, P.E.

Director of Public Works/City Engineer RMRA Measure M R Local Return Gas Tax eet Rehab.- Area 1a, 1b, 2 (Design) n)ntain Laurel) anyon to Lemon) to BCY) $ 82,779 82,779 $ om Pathfinder to Mountain Laurel Way) (Const.) $ 1,200,000 1,200,000 $ eet Rehab - Area 1 (Const.) $ 925,000 2,000,000 $ 850,000 $ 89,0 $ en Springs from Brea Canyon to Lemon Ave.) (Const.) $ 500,000 900,000 $ mp Project (Const.) $ 177,855 nt Projects $ 4,360,634 $ 1,700,000 $ 1,007,779 $ 850,000 $ 89,0 250-5510-46412) Project Description Total FY Budget (109) Measure M (111) Gas Tax (112) Prop A (113) Prop C Sign and HSL Replacement (Design) $ 50,000 50,000 $
Sign and HSL Replacement (Construction) $ 350,000 350,000 $ al 11 Locations (Design and Construction) $ 90,000 380,000 $ 100,000 $ 190,0 $ $ 780,000 $ 350,000 $ 140,000 $ 100,000 $ 190,0
ments (250-5510-46413)
Project Description Total FY Budget (113) Prop C Foothill Transit Grant $ 60,000 60,000 $
SD/Calbourne $ 40,000 40,000 $
nfrastructure Improvements $ 60,000 100,000 $ 40,000 $
0-5510-46420)
Project Description Total FY Budget (107) Measure W (108) RMRA (109) Measure M (113) Prop C ovements-Phase 3 (Flapjack-Design) $ 65,000 65,000 $
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ATTACHMENT 2

LAD BOUNDARY MAPS
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LAD# 39-2022
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LAD# 41-2021
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Exhibit B –
Contractor's
Bid
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City of Diamond Bar
Request for Proposals
Landscape Assessment, Design Standards, and Improvement Planning for District NOS.39022 41-2021
January 8, 2026
Presented to:

March 20, 2018
Prepared By:

R H A L a n d s c a p e A r c h i t e c t s - P l a n n e r s , I n c . 68 4 0 I n d i a n a A v e n u e
S u i t e 100
R i v e r s i d e , CA 92506
951 - 7 8 1 - 1 9 3 0
w w w . r h a l a . c o m
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68 40 I N D I A N A A V E N U E , S U I T E 100 , R I V E R S I D E , C A L I F O R N I A 9 2 5 0 6 ( 9 5 1 ) 7 8 1 - 1 9 3 0 w w w . r h a l a , c o m L I C E N S E # 2 7 9 9 January 8, 2026
David G. Liu P.E.

Director of Public Works/City Engineer
City of Diamond Bar
21810 Copley Drive
Diamond Bar, CA 91765
RE: REQUEST FOR QUALIFICATIONS

DESIGN SERVICES FOR RYAN PARK PLAYGROUND IMPROVEMENTS
Dear David,
On behalf of RHA Landscape Architects-Planners, I am pleased to submit our proposal for the Landscape Assessment, Design Standards, and improvement Planning for District NOS.39-2022 and 41-2021. With over 40 years of experience in park planning, landscape architecture, and public infrastructure design, our team is well-prepared to deliver a comprehensive set of improvements that align with the City of Diamond Bar’s goals for
comprehensive landscape and irrigation assessment,
phased improvement plan and guide to future landscape
enhancements. We understand that the landscape
conditions very across the districts, many areas consisting of native plant material or are largely unimproved from the original development. Irrigation systems have not been
improved since the original development and some may
not even be operational.

The RHA staff has extensive experience in evaluation
existing landscapes and irrigation and has successfully delivered evaluations and recommendations for numerous
projects.

Most recently we have provided similar for Crafton Hills College and Peirce Colleges for Campus wide irrigation
renovation projects. We have also provided Landscape and Irrigation Standards for many agencies including the City of Landcaster, the City of Riverside, San Bernarding Community College District and the San Jacinto Community College District to name a few.
1 Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

Landscape Assessment and design Standards January 8, 2026 Diamond Bar, CA
RHA LANDSCAPE ARCHITECTS - PLANNERS, INC.

Our recommendations included landscape standards, details, estimated costs and phasing strategies. Our focus will be on reduced maintenance and water use requirements required by the landscape while at the same time beautifying the parkways slopes and mini parks We visited the both Landscape Districts No. 41 and No. 39 and also viewed the sites on Google Earth. We understand and observed that the landscapes have not been touched
since the homes were developed and it is time for irrigation repair and landscape upgrades. With fire prevention being such a high priority due to recent fires the fuel modifications areas behind the homes will be a high priority which RHA can help with.

The RHA staff is highly experienced and knowledgeable
about all the issues and priorities that may come up on this project. We do all our irrigation design in house and have a native plant expert on staff. We even have experience
working with Cal Fire using work crews to provide fuel
modifications to native slopes and landscape areas around residential neighborhoods.

We will meet all required insurance, licensing, and
indemnification obligations and confirm that no conflicts of interest exist. This proposal is valid for 90 days.

We look forward to the opportunity to partner with the City of Diamond Bar to deliver comprehensive landscape and
irrigation assessment, phased improvement plan and
guide to future landscape enhancements that will provide critical direction to the Landscape districts for years to come.

Cordially,
RHA Landscape Architects-Planners, Inc.

Doug Grove, RLA, ASLA, LEED® AP
President
951-781-1930 ext 121
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Landscape Assessment, Design Standards January 8, 2026
City of Diamond Bar, CA
RHA LANDSCAPE ARCHITECTS - PLANNERS, INC.

Organization and Staffing
Organization and Staffing
Our team includes nine dedicated professionals, including six licensed landscape architects, who work collaboratively under a team-based approach directed by the firm’s principals and associates. Please refer to the following pages for resumes of key staff.

RHA STAFF
Doug Grove, RLA, ASLA President/Landscape Architect/LEED AP Greg Meek, RLA Principal/Landscape Architect
David Black, RLA Project Manager/Landscape Architect
Lauren McHugh, RLA Project Manager/Landscape Architect
Mike Salazar, RLA Project Manager/Landscape Architect
Jennifer Salazar Project Manager/Landscape Designer
Andrew Lytle Project Manager/Landscape Designer
Arielle Talley Project Manager/Landscape Designer
Andy Emery, RLA Construction Administration/Landscape Architect Marissa Trout Office Manager
Doug Grove Greg Meek
President Principal
Landscape Architect Landscape Architect

LEED AP
David Black Mike Salazar
Project Manager Project Manager
Landscape Architect Landscape Architect
Jennifer Salazar Lauren McHugh
Project Manager Project Manager
Landscape Designer Landscape Architect
Arielle Talley Andrew Lytle
Project Captain Project Manager
Landscape Designer Landscape Designer
Office Manager
Accounting
RHA Organizational Chart
QC & Const Admin
Landscape Architect
Andy Emery
Marissa Trout
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Landscape Assessment, Design Standards January 8, 2026
City of Diamond Bar, CA
RHA LANDSCAPE ARCHITECTS - PLANNERS, INC.

Approach and Scope of Work
Approach and Scope of Work
Project Objective
We understand the existing landscape conditions vary across the districts. Many areas consist of native vegetation or remain largely unimproved since the original development. In addition, nearly all irrigation systems were installed at the time of development and may no longer be functional or adequate for current needs. RHA will evaluate these conditions, identify opportunities for improvement, and develop design and irrigation standards compatible with City standards and the surrounding environment.

The main objectives of the Landscape Assessment District Nos. 39-2022 and 41-2021project are as follows:

1. Provide a comprehensive assessment and phased improvement plan that can guide future landscape enhancements.

2. Improvements will be implemented over time in accordance with the phasing and prioritization recommendations developed through this project.

3. Evaluate the irrigation system conditions identify opportunities for improvement, and develop design and irrigation standards compatible with City standards and the surrounding environment.

Scope of Services and Project Understanding
RHA understands that the scope of work, includes, but is not limited to:

The preparation of a comprehensive Landscape Assessment, Design Standards, and Improvement Planning Report for Landscape Assessment District Nos. 39-2022 and 41-2021, including, but not limited to, the following tasks:

1. Property Identification
a. Using City-provided data, identify all properties within the district boundaries that are maintained by the City.
b. We understand the City will provide all available records for both districts, including assessment district maps, ownership/maintenance information, and any historical documentation.
i. RHA will not be expected to conduct additional records research beyond reviewing these materials.
c. Document property ownership, current maintenance responsibility, and location details.

2. Landscape Inventory and Assessment
a. RHA will identify all landscape areas eligible for improvements, including:
i. Slopes on private property within district boundaries. 19 Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

Landscape Assessment, Design Standards January 8, 2026
City of Diamond Bar, CA
RHA LANDSCAPE ARCHITECTS - PLANNERS, INC.

Approach and Scope of Work
ii. “Pocket parks” in District 39-2022.
iii. Clarification: This assessment excludes all fire brush and trail areas; only the slopes and mini-parks shall be evaluated.
b. RHA will document existing conditions for each area, including:
i. Irrigation access.
ii. Existing trees and vegetation types.
iii. Plant species and health.
iv. Soil and grading conditions.
v. Other relevant site features.
vi. Photographic documentation capturing representative conditions, notable features, and issues.

3. Design Standards Development
a. RHA will develop design standards for slopes, including:
i. Trees, shrubs, and other vegetation.
ii. Drought-tolerant and low-maintenance plantings.
iii. Compatibility with City standards and surrounding environment. b. RHA will develop irrigation design standards for:
i. New installations.
ii. Upgrades to existing systems.
iii. Replacement or rehabilitation of existing irrigation infrastructure.

4. Project Phasing
a. RHA will group areas into logical “project phases” for implementation, separately for each district.
b. RHA will prepare an order-of-magnitude cost estimate for each phase based on:
i. Estimated construction and maintenance costs.
ii. Necessity factors such as fire hazard risk, erosion control, or public safety concerns.
iii. Other relevant considerations.

5. Deliverables for each District
a. RHA will prepare a comprehensive report
i. Property and landscape inventory.
ii. Existing conditions, including photographic documentation of all areas captured during the landscape inventory.
iii. Design standards for vegetation and irrigation.
iv. Project phasing and order-of-magnitude cost estimates.

Optional Tasks
RHA understands that the following tasks are not mandatory for the base scope of work but RHA can provide them as optional services the and we are capable of providing these services and may be authorized by the City at its discretion:

A. RHA will can provide Community Engagement and Public Input 20 Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

Landscape Assessment, Design Standards January 8, 2026
City of Diamond Bar, CA
RHA LANDSCAPE ARCHITECTS - PLANNERS, INC.

Approach and Scope of Work
• Conduct public workshops or surveys to gather input on desired landscape improvements.
• Incorporate community priorities into design standards and project phasing.

B. RHA will can provide City Council Presentations
• Participate in one City Council meeting to present project findings, assessment results, and conceptual improvement recommendations prior to final design C. RHA will can provide a Maintenance & Lifecycle Cost Assessment • Provide estimated long-term maintenance costs for proposed improvements.
• Recommend maintenance practices or schedules for new plantings and irrigation systems.

D. RHA will can provide Graphic Renderings of Proposed Landscape Treatments • Prepare graphic renderings or visual simulations illustrating proposed landscape design concepts, including representative slope treatments, planting palettes, and irrigation improvements.
• Provide at least one “typical slope” rendering depicting how recommended plant species, densities, and design standards would appear once implemented.

E. RHA will can provide GIS Shapefiles or Geodatabase
• Prepare GISshapefiles ora geodatabase compatible withArcGIS, including clearly attributed fields for project-specific areas assessed, project phases, landscape features, and site conditions.
• Include locations of photographs taken during the landscape inventory, with linked image files or descriptive attributes.
• Ensure GIS data is organized and documented so it can be readily used for planning, analysis, and future updates.
21 Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

Diamond Bar Landscape Assessment
Project Schedule 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

3.1.1 Facilitate the Accessment, Standards, & Planning Process

3.1.2 Review Existing Documentation

3.1.3 Landscape Inventory & Assessment

3.1.4 Document Existing Conditions for Each Area

3.1.5 Prepare Landscape & Slope Design Standards

3.1.6 Prepare Irrigation Design Standards

3.1.7 Project Phasing

3.1.8 Preparation of the Comprehensive Report

3.1.9 Otpional Task 1- Community Engagement and Public Input

3.1.10 Otpional Task 2- City Council Presentation

3.1.11 Otpional Task 3- Maintenance & Lifecycle Cost Assessment

3.1.12 Otpional Task 4- Graphic Renderenings of Landscape Areas

3.1.13 Otpional Task 5- GIS Shapefiles or Data Base
Month
7 Month
8 Month
9 Month
1 Month
2 Month
3 Month
4 Month
5 Month
6 22
Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

Diamond Bar Landscape Assessment & Design Standards Fee Proposal RHA Principal Project
Manager
Landscape
Designer
$210 $180 $150
Property Identification, Inventory & Assessment
Property Identification 1 2 16 2,970 $
Landscape Inventory and Assessment - Slopes 2 4 960 $
Landscape Inventory and Assessment - Pocket Parks 2 4 960 $ Landscape Inventory and Assessment - Brush & Trails 2 4 960 $ Document Existing Conditions - Irrigation 2 16 2,760 $
Document Existing Conditions - Trees, Shrubs, & Vegetation 2 4 960 $ Document Existing Conditions - Plant Species & Health 2 4 960 $ Document Existing Conditions - Soil & Grading Conditions 2 4 960 $ Document Existing Conditions - Other Relevant Site Features 2 4 960 $ Photographic Documentation 2 8 1,560 $
Meetings with City Staff (4) 4 4 4 2,160 $
Subtotal Hours 5 24 72 101
Subtotal Dollars 1,050 $ 4,320 $ 10,800 $ 16,170 $
Expenses 1,000 $
TOTAL $ 17,170
Design Standards Development, Project Phasing, & Comprehensive Report Design Development Standards - Slopes 2 4 960 $
Design Development Standards - Trees, Shrubs & Vegetation Types 2 4 960 $ Design Development Standards - Drought Tolerant & Low Maintenance Plantings 2 4 960 $ Design Development Standards - Compatibility with City Standards 2 2 660 $ Design Development Standards - Irrigation New Installations 2 8 1,560 $ Design Development Standards - Irrigation Upgrades to Existing Systems 2 8 1,560 $ Design Development Standards - Irrigation Replacement or Rehabilitation to Infrastructure 2 8 1,560 $ Create Project Phasing for Separate Projects for Both Area 2 8 1,560 $ Prepare Order of Magnitude Estimated Construction Costs All Phases 2 8 1,560 $ Prepare Order of Magnitude Estimated Maintenance Costs All Phases 2 4 960 $ Prepare Draft Comprehensive Assessment and Phased Improvement Report 8 40 7,440 $ Prepare Final Comprehensive Assessment and Phased Improvement Report 8 40 7,440 $ Meetings with City Staff (4) 4 4 4 2,160 $
Subtotal Hours 4 40 142 186
Subtotal Dollars 840 $ 7,200 $ 21,300 $ 29,340 $
Expenses 1,000 $
TOTAL 30,340 $
TOTAL HOURS 9 64 214 287
TOTAL EXPENSES 2,000 $
TOTAL FEES 1,890 $ 11,520 $ 32,100 $ 45,510 $
TOTAL DOLLARS $ 47,510
Optional Tasks
Community Engagement and Public Input (2 public workshops and survey) 8 8 3,120 $ City Council Presentation 4 4 1,560 $
Maintenance and lifecycle Assessment 2 16 2,760 $
Graphic Renderings of Proposed Landscape Treatments 4 32 5,520 $ GIS Shapefile and Geodatabase 4 100 15,720 $
Subtotal Hours 12 22 148 182
Subtotal Dollars 2,520 $ 3,960 $ 22,200 $ 28,680 $
Expenses 500 $
TOTAL 29,180 $
$2,000
$17,170
$1,000
$30,340
1/8/2026
$47,510
TASK
RHA Landscape Architects-Planners,
Inc.

TOTAL
$1,000
$29,180
$500
Docusign Envelope ID: B8A3C02E-B7F7-404B-9230-97F2B35FFA4E

Agenda Item #: 9.1
Meeting Date: March 17, 2026

CITY COUNCIL AGENDA REPORT
TO: Honorable Mayor and Members of the City Council
FROM: Daniel Fox, City Manager
SUBJECT: Development Code Amendment No. PL2024-51 (Objective Design Standards).

STRATEGIC GOAL: Open, Engaged and Responsive Government RECOMMENDATION:

A. Open the public hearing to receive public testimony; B. Close the public hearing; and
C. Introduce for first reading by title only, waive full reading of Ordinance No. 04 (2026), and set for second reading and adoption at the April 7, 2026 City Council meeting:

AN ORDINANCE OF THE CITY OF DIAMOND BAR AMENDING TITLE 22 OF THE DIAMOND BAR MUNICIPAL CODE ("DEVELOPMENT CODE"), ADDING CHAPTER 22.19 TO ESTABLISH MULTIFAMILY AND MIXED-USE RESIDENTIAL OBJECTIVE DESIGN STANDARDS (“ODS”) IN ACCORDANCE WITH STATE HOUSING LAW - PLANNING CASE NO. PL2024-51.

FINANCIAL IMPACT:

Sufficient funds for the preparation of citywide objective design standards were allocated within the General Plan Update Fund (103) as part of the FY 2023/24 Adopted Budget, for a not-to-exceed amount of $185,000.

BACKGROUND:

Recent State housing legislation, including Senate Bill 35 and Senate Bill 330, established mandates for cities and counties to streamline the review process for multifamily housing, including mixed-use developments.

Consequently, local agencies are now required to limit their review of qualifying housing projects to objective standards. ODS will apply to construction projects located anywhere in the City involving the development or substantial improvement to multifamily residential projects including duplexes, townhouses or multifamily dwellings or mixed-use projects featuring a combination of multifamily residential and other uses. ODS will not apply to single-family housing in single-family zones, or to nonresidential projects.

The legislation defines “objective standards” as standards that involve no personal or subjective judgment by a public official and are uniformly verifiable by reference to an external and uniform benchmark or criterion.

Agenda Item #: 9.1
Meeting Date: March 17, 2026
In addition, Program H-8 of Diamond Bar’s certified 6th Cycle (2021-2029) Housing Element commits the City to update the Development Code (Title 22 of the Diamond Bar City Code) to include objective standards as part of its broader obligation to minimize constraints on housing supply and affordability.

Presently, Diamond Bar reviews housing projects using both objective and non-objective standards established through the Development Code and the Citywide Design Guidelines. To bring Diamond Bar into compliance with State law, as well as implement its Housing Element programs, the City must proceed with the formulation of solely objective standards to govern the design of the aforementioned residential and mixed-use project types. The standards will then be utilized by staff and the Planning Commission as the basis to approve or deny such projects. The absence of ODS would compel the City to limit its review of these project types to only the most basic development standards currently in place, such as setbacks, height and parking requirements; architectural style and form-based criteria such as bulk, mass, scale and neighborhood compatibility would be beyond the City’s authority to regulate design, and can no longer be the basis for denying a project until a comprehensive ODS ordinance is adopted.

In 2024, the City retained Torti Gallas + Partners (TG+P) to develop ODS under an amendment to the Consultant Services Agreement for the Town Center Specific Plan. Staff held a kickoff meeting and toured the City with TG+P on July 24, 2024. The project team collected data, reviewed background documents such as existing design standards and guidelines, as well as ODS from other cities as the basis for expressing desired qualitative outcomes through the application of objective standards.

Prior to preparing the draft standards, the City conducted a joint study session with the City Council and Planning Commission on October 8, 2024. The purpose of the study session was to introduce the ODS project, explain the process, and invite feedback and direction to guide the preparation of the draft ODS. Key discussion points were considered and incorporated into the draft ODS, such as restricting Contemporary architecture adjacent to existing single-family residential neighborhoods. Following the meeting, the project team proceeded with preparation of the ODS, which included core tasks defining various types of multifamily and mixed-use buildings and identifying their associated design elements. The tasks included:
• Research of existing architectural styles in the City. • Identified stakeholder groups and conducted meetings to gather feedback. • Defined various building types, frontage types, and style options. • Creation of a user-friendly document showcasing these design options.

ANALYSIS:

Adoption Process
Before the City Council adopts an ordinance to amend the Development Code, the Planning Commission must first conduct a public hearing to consider the proposed amendments. The Commission then forwards its recommendations via a resolution advising the Council whether or not the proposed amendments should be adopted.

Planning Commission Review
On February 24, 2026, after conducting a duly noticed public hearing, the Planning Commission adopted Resolution No. 2026-03, recommending, by a 4-0 vote (one absence), that the City Council adopt the attached ordinance amending Title 22 (Attachment 1). The staff report and draft meeting minutes from that meeting are included as Attachments 3 and 5 respectively.

No public comments were received prior to or during the Planning Commission hearing.

Proposed Development Code Amendment:

Agenda Item #: 9.1
Meeting Date: March 17, 2026
The proposed Development Code Amendment would amend Title 22 of the City’s Development Code to establish objective design standards. If adopted, the ordinance would add DBCC Chapter 22.19 and incorporate by reference a new document entitled Diamond Bar Objective Design Standards for Multifamily and Mixed-Use Development, provided as Exhibit 1 to the draft ordinance (Attachment 1). The document is organized into seven chapters:

1. Introduction

2. Building Type Standards

3. Building Articulation Standards

4. Frontage Types

5. Site and Open Space Standards

6. Architectural Styles

7. Glossary
Below is a summary of these chapters:

Chapter 1 – Introduction
This chapter provides an introduction to the ODS which includes the following: purpose and intent, goals, design principles, applicability, how to use the document, and relationship with the General Plan and Development Code. The Development Code will continue to govern basic development standards, while the ODS will further refine specific standards related to architectural styles and building design.

Chapter 2 – Building Type Standards
To support a variety of household types, the ODS provides a broad range of building type options for multifamily and mixed-use residential development including: townhouses, flex/lofts, walkups, courtyard buildings, urban block structures, and wrap buildings. Once a specific building type is selected, the development must comply with the associated standards, including maximum façade width, pedestrian access, parking, common open space, landscaping, frontage types, and overall massing.

Flex/Loft Building Diagram Example
Chapter 3 – Building Articulation Standards
In order to preserve the City's character, new development shall be designed to avoid a monolithic appearance. This Chapter establishes standards that require larger projects be articulated as coordinated groupings of smaller structures that, together with a well-designed streetscape, support the City’s vision for highquality development. Some techniques to achieve this include horizontal and vertical articulation, architectural projections and recessions, façade differentiation, architectural style differentiation and base–middle–top articulation. Articulation refers to the deliberate arrangement and detailing of a building’s elements to express

Agenda Item #: 9.1
Meeting Date: March 17, 2026
its structure and spatial functions meaningfully. It involves creating visual connections between different parts of a design—for example, using columns, ledges, or level changes to define spaces or employing varied textures, colors, and materials on a façade to enhance visual interest.

Architectural Style Differentiation Diagram Example
Chapter 4 – Frontage Types
A building’s frontage serves as the interface between the public realm and private development. Thoughtful design of this interface is essential to creating an active and engaging urban environment. Multifamily and mixed-use buildings should feature ground-floor frontages that are human-scaled, visually interesting, and provide direct access to ground-floor uses. This chapter presents a range of prototypical frontage types, along with associated standards for dimensional requirements, openings, and ground-plane features such as furnishing zones, paving and landscaping.

Raised Commercial Terrace Illustrative Photo
Chapter 5 – Site and Open Space Standards
This chapter establishes standards addressing the functional aspects of buildings and the detailed design of outdoor spaces. Notable provisions include requirements for outdoor seating areas and furnishings to be constructed of specified materials, landscaping to incorporate tiered designs, and retaining walls to be decorative when visible from the street. The goal of this chapter is to ensure that outdoor space design supports and enhances the creation of a human-scaled, urban environment.

Agenda Item #: 9.1
Meeting Date: March 17, 2026
Tiered Planting Illustrative Example
Chapter 6 – Architectural Styles
Multifamily and mixed-use residential development shall conform to one architectural style and one corresponding building type for each proposed building. This chapter identifies five architectural styles that may be utilized for adherence to the ODS: Main Street Commercial, Spanish Revival, Craftsman, Art Deco, and California Contemporary. These styles were selected because variations of them are among the most prominent throughout the San Gabriel Valley. Each style is described to help users understand its historical context and to guide the preparation of contemporary designs that reflect these traditional styles.

Spanish Revival Illustrative Photo Example
Chapter 7 – Glossary
This chapter provides definitions of terms and phrases used throughout the ODS that are technical or that may not reflect common usage, and is intended to supplement the Development Code definitions (DBCC Chapter

22.80). If a definition in the OSD conflicts with a definition in the Development Code, the ODS definitions shall control for the purposes of new developments. If a word or phrase used in the ODS is not defined in the ODS or in the Development Code, the Director shall make a determination, giving deference to common usage and the context in which the term or phrase is used.

City Attorney Review

Agenda Item #: 9.1
Meeting Date: March 17, 2026
The City Attorney’s Office identified necessary edits to the draft ODS to ensure all standards are truly objective, which have been incorporated into the final version.

ENVIRONMENTAL REVIEW:

On December 17, 2019, the Diamond Bar City Council certified Final EIR (No. SCH 2018051066) for the Diamond Bar 2040 General Plan and Climate Action Plan. In 2022, the City adopted the 2021-2029 Housing Element Update and concurrently amended the General Plan 2040 Land Use and Economic Development Element.

The potential impacts of the 2021-2029 Housing Element Update and concurrent Land Use and Economic Development Element amendment were determined to be within the scope of the Certified EIR. The City concluded that neither a subsequent nor a supplemental EIR was required. Accordingly, the City adopted Addendum No. 1 to the Certified EIR on August 11, 2022.

The draft ODS anticipates residential and mixed-use development consistent with the assumptions in the 2040 General Plan and analyzed in the General Plan EIR. CEQA Guidelines Section 15164(a) states: “The lead agency or responsible agency shall prepare an addendum to a previously certified EIR if some changes or additions are necessary but none of the conditions described in Section 15162 calling for preparation of a subsequent EIR have occurred.” Pursuant to CEQA Guidelines Section 15164, the City has prepared Addendum No. 2 to the General Plan EIR (Attachment 2), which demonstrates that adoption of the ODS would not result in a new significant impact or a substantial increase in the severity of previously identified significant impacts analyzed in the Certified EIR for the City General Plan 2040. In addition, the information throughout the addendum affirms that there is no new information of substantial importance that was previously unknown and is now available. Therefore, a subsequent EIR would not be required pursuant to Section 15162 of the State CEQA Guidelines. The City has thus determined an addendum to the previously Certified EIR to be the appropriate environmental compliance document for the proposed project.

NOTICE OF PUBLIC HEARING:

Notice for this hearing was published in the San Gabriel Valley Tribune newspaper on March 6, 2026, in a 1/8- page display. Pursuant to Planning and Zoning Law Government Code Section 65091(a)(4), if the number of property owners to whom a public hearing notice would be mailed is greater than 1,000, a local agency may provide notice by placing a display advertisement of at least 1/8 page in one newspaper of general circulation. A copy of the public notice was also posted at the City’s designated community posting sites.

LEGAL REVIEW:

The City Attorney has reviewed and approved the Ordinance as to form.

PREPARED BY:

Mayuko Nakajima, Senior Planner, Community Development
ATTACHMENTS:

1. Ordinance No. 04 (2026); Citywide Objective Design Standards

2. Addendum No. 2 to the Diamond Bar Comprehensive General Plan Update and Climate Action Plan Environmental Impact Report

3. Planning Commission Staff Report (attachments not included) Dated February 24, 2026

4. Planning Commission Resolution No. 2026-03 (attachments not included)

5. Planning Commission Meeting Draft Minutes Dated February 24, 2026

ORDINANCE NO. 04 (2026)

AN ORDINANCE OF THE CITY OF DIAMOND BAR AMENDING
TITLE 22 OF THE DIAMOND BAR MUNICIPAL CODE ("DEVELOPMENT CODE"), ADDING CHAPTER 22.19 TO ESTABLISH MULTIFAMILY AND MIXED-USE RESIDENTIAL OBJECTIVE DESIGN STANDARDS (“ODS”)

IN ACCORDANCE WITH STATE HOUSING LAW - PLANNING CASE
NO. PL2024-51.

WHEREAS, Title 22 (Development Code) of the Diamond Bar City Code (DBCC) establishes allowable uses of property and related development standards within all zoning districts in the City; and
WHEREAS, several provisions of State law, including, but not limited to, Senate Bill 35 and Senate Bill 330, established mandates for cities and counties to streamline the review process for multifamily housing, including mixed-use residential developments, and require local agencies to limit their review of qualifying housing projects to objective standards; and
WHEREAS, implementation of Program H-8 of Diamond Bar’s certified 6th Cycle (2021-2029) Housing Element commits the City to update the Development Code to include objective standards as part of its broader obligation to minimize constraints on housing supply and affordability; and
WHEREAS, the City desires to establish ODS applicable to multifamily housing and mixed-use residential development projects in the City in order to implement the Housing Element and to appropriately regulate development in a manner consistent with State law and which facilitates a fair and efficient review process that results in high quality development and buildings that are appropriate for their context and environment; and WHEREAS, on February 24, 2026, the Planning Commission held a duly noticed public hearing regarding proposed amendments to Title 22 (“Development Code”) of the Diamond Bar City Code, Planning Case No. PL2024-51, and adopted Resolution No. 2026-03 recommending City Council approval of said Development Code Amendment; and
WHEREAS, pursuant to Government Code Section 65090, a notice of at least 1/8 page display was published in the San Gabriel Valley Tribune newspaper on March 6, 2026, and a copy of the public notice was posted at the City’s designated community posting sites; and
WHEREAS, on March 17, 2026, the City Council held a duly noticed public hearing regarding the proposed Development Code Amendment; and
WHEREAS, the City Council finds that this Ordinance is subject to the California Environmental Quality Act (“CEQA”). Pursuant to CEQA Guidelines Section 15164, the City has prepared Addendum No. 2 to the General Plan EIR (No. SCH 2018051066),

Ordinance No. 04 (2026)
2 which demonstrates that adoption of the ODS would not result in new or substantially more severe impacts beyond those that were evaluated in the EIR for the City General Plan 2040; therefore, no subsequent environmental document is required; and

WHEREAS, the documents and materials constituting the administrative record of the proceedings upon which the City's decision is based are located at the City of Diamond Bar, Community Development Department, Planning Division, 21810 Copley Drive, Diamond Bar, CA 91765; and
WHEREAS, the City Council hereby adopts the facts and reasons stated in Planning Commission Resolution No. 2026-03 recommending City Council approval of the said Development Code Amendments, a copy of which is on file with the City Clerk and which is incorporated herein by reference with the same force and effect as if set forth in full.

NOW, THEREFORE, the City Council of the City of Diamond Bar does hereby find, determine and ordains as follows:

SECTION 1: Chapter 22.19 (Objective Design Standards for Multifamily and Mixed-Use Development) of Title 22 of the Diamond Bar City Code is hereby added as follows:

Sec. 22.19.010. – Purpose.

The purpose of this chapter is to establish citywide objective design standards (ODS) to ensure consistent, transparent, and measurable review of multifamily and mixed-use residential development projects in accordance with State law. The ODS is intended to streamline project approvals by providing clear verifiable criteria for design that do not require subjective interpretation.

Sec. 22.19.020. – Applicability.

The objective design standards will apply to construction projects located anywhere in the City involving the development or substantial improvement of any of the following:

1. Multifamily residential projects, including duplexes, townhouses, or multifamily dwellings.

2. Mixed-use projects featuring a combination of multifamily residential or other uses.

All such development shall be subject to the Diamond Bar Objective Design Standards for Multifamily and Mixed-Use Development, which is on file with the City Clerk, and which is incorporated by reference into this Section 22.19.020 as if fully set forth herein.

SECTION 2: Subsection (m) of Section 22.80.020 (Definitions of specialized terms and phrases) of Title 22, Chapter 22.80 of the Diamond Bar City Code

Ordinance No. 04 (2026)
3 is amended to add a new definition for “mixed-use” as follows:
(m) Definitions, “M.” The following definitions are in alphabetical order:
…
Mixed-use. The combination of nonresidential and residential uses located on the same property as part of a unified development. Mixed-use development may consist of commercial and residential uses integrated either vertically (vertical mixed-use) in the same structure or group of structures, or horizontally on the same development site (horizontal mixed-use) where parking, open spaces, and other development features are shared. In a residential/commercial mixed-use development, both uses are considered primary uses of the land.
…
SECTION 3: The City Council hereby adopts the Diamond Bar Objective Design Standards for Multifamily and Mixed-Use Development, incorporated by reference in DBCC Chapter 22.19 (Objective Design Standards for Multifamily and Mixed-Use Development) and attached to this Ordinance as Exhibit 1. The City Council further directs the City Clerk to maintain a copy of said manual on file in Office of the City Clerk, make it freely accessible to the public, and to cause a copy of the manual to be posted on the official City of Diamond Bar website.

SECTION 4: If any section, subdivision, paragraph, sentence, clause or phrase of this Ordinance is for any reason held to be invalid or unconstitutional, such decision shall not affect the validity of the remaining portions of this Ordinance. The City Council hereby declares that it would have passed this Ordinance, and each section, subdivision, paragraph, sentence, clause and phrase thereof, irrespective of the fact that any one (or more) section, subdivision, paragraph, sentence, clause or phrase had been declared invalid or unconstitutional.

SECTION 5: The City Clerk shall attest and certify to the passage and adoption of this Ordinance within 15 days after adoption, cause it to be published or posted in accordance with California law, and it shall be effective 30 days after adoption pursuant to Government Code Section 36937.

APPROVED AND ADOPTED at a regular meeting of the City Council of the City of Diamond Bar on the ____th day of ____, 2026.

CITY OF DIAMOND BAR
__________________________
Steve Tye, Mayor

Ordinance No. 04 (2026)
4 ATTEST:

I, Kristina Santana, City Clerk of the City of Diamond Bar, do hereby certify that the foregoing Ordinance was duly introduced at a regular meeting of the City Council of the City of Diamond Bar held on the __th day of ___, 2026, and was finally passed at a regular meeting of the City Council of the City of Diamond Bar held on the __th day of ____, 2026, by the following vote:

AYES: Councilmembers:

NOES: Councilmembers:

ABSENT: Councilmembers:

ABSTAIN: Councilmembers:

Kristina Santana, City Clerk

DIAMOND BAR California

FOR MULTIFAMILY &

MIXED-USE DEVELOPMENT
FEBRUARY 05, 2026

DIAMOND BAR

OBJECTIVE

DESIGN STANDARDS
DRAFT
EXHIBIT 1

Diamond Bar Objective Design Standards for Multifamily & Mixed-Use Development

ACKNOWLEDGEMENTS

ACKNOWLEDGEMENTS
i

CITY OF DIAMOND BAR

CITY COUNCIL
Steve Tye, Mayor
Ruth M. Low, Mayor Pro Tem
Andrew Chou, Council Member
Stan Liu, Council Member
Chia Yu Teng, Council Member

PLANNING COMMISSION
Brian Worthington, Vice Chairperson
Bill Rawlings, Commissioner
Ruben Torres, Commissioner
Surendra Mehta, Commissioner
Lee Mao, Commissioner
Naila Barlas, Former Commissioner

LEGAL COUNSEL
Omar Sandoval
James H. Eggart
Ricia R. Hager
Dan Cruz

CITY STAFF
Daniel Fox, City Manager
Greg Gubman, Community Development Director
Grace S. Lee, Planning Manager
Mayuko Nakajima, Senior Planner
Rudy Lopez, Assistant Planner
Arlene Laviera, Administrative Coordinator

Diamond Bar Objective Design Standards for Multifamily & Mixed-Use Development

ACKNOWLEDGEMENTS
ii

CONSULTANT TEAM
TORTI GALLAS + PARTNERS, INC
Master Planning and Urban Design
Neal I. Payton, FAIA, FCNU, Principle-in-charge
Rogelio Huerta
Betina Sason

SAPPHOS ENVIRONMENTAL, INC
Environmental

Diamond Bar Objective Design Standards for Multifamily & Mixed-Use Development

TABLE OF CONTENTS

1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 Purpose and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2 Goals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Design Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.4 Applicability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.5 How to Use This Document. . . . . . . . . . . . . . . . . . . . . . . 7

1.6 Relationship with General Plan and Development Code. . 9

2. Building Type Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2 Explanation of Standards. . . . . . . . . . . . . . . . . . . . . . . 13

2.3 Allowable Building Types. . . . . . . . . . . . . . . . . . . . . . . . 16

2.3.1 Duplex, Triplex, Fourplex. . . . . . . . . . . . . . . . . . . . 17

2.3.2 Townhouse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.3 Flex/Loft Building. . . . . . . . . . . . . . . . . . . . . . . . . 21

2.3.4 Auto Court or Six/Eight Pack. . . . . . . . . . . . . . . . 23

2.3.5 Walk-Up Flats. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.3.6 Carriage House. . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.3.7 Small Mixed-Use Building. . . . . . . . . . . . . . . . . . . 29

2.3.8 Courtyard Multi-Family Building. . . . . . . . . . . . . . 31

2.3.9 Wrap Building. . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

2.3.10 Urban Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

2.3.11 Mixed-Use Big Box. . . . . . . . . . . . . . . . . . . . . . . . 37

3. Building Articulation Standards. . . . . . . . . . . . . . . . . . . . . . . . . 39

3.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.2 Building Articulation Techniques. . . . . . . . . . . . . . . . . 42

3.3 Transition to Single-Family Residential Districts. . . . . . 46

3.4 Entrances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.5 Passageways. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.6 Windows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.7 Roof Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.8 Encroachments and Projections. . . . . . . . . . . . . . . . . . 48

3.9 Shopfronts in Mixed-Use Buildings. . . . . . . . . . . . . . . . 50

3.10 Colors and Materials. . . . . . . . . . . . . . . . . . . . . . . . . . 51

4. Frontage Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.1 Purpose and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4.2 Explanation of Standards. . . . . . . . . . . . . . . . . . . . . . . 55

4.3 Shopfronts in Mixed-Use Buildings. . . . . . . . . . . . . . . . 57

4.4 Raised Commercial Terrace in Mixed-Use Buildings. . . . 58

TABLE OF CONTENTS
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Diamond Bar Objective Design Standards for Multifamily & Mixed-Use Development

TABLE OF CONTENTS

4.5 Stoop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

4.6 Dooryard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

4.7 Front Porch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.8 Forecourt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

4.9 Raised Residential Terrace. . . . . . . . . . . . . . . . . . . . . . 63

4.10 Urban Frontage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

5. Site and Open Space Standards. . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.1 Purpose and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

5.2 Grading Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

5.3 Outdoor Seating Areas, Cafes and Restaurants in
Mixed-Use Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

5.4 Outdoor Furnishings Visible from ROWs Applicable to Mixed-Use Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

5.5 Landscape Standards. . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.6 Common Open Space. . . . . . . . . . . . . . . . . . . . . . . . . . . 70

5.7 Interior Courtyards. . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

5.8 Fences, Hedges and Walls. . . . . . . . . . . . . . . . . . . . . . . 71

5.9 Retaining Walls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

5.10 Vehicular Parking. . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

5.11 Loading Areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

5.12 Bicycle Parking Standards. . . . . . . . . . . . . . . . . . . . . . 72

5.13 Service and Auxiliary Equipment. . . . . . . . . . . . . . . . . 73

5.14 Exterior Lighting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

6. Architectural Styles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

6.1 Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

6.2 Main Street Commercial. . . . . . . . . . . . . . . . . . . . . . . . 77

6.3 Spanish Revival. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

6.4 Craftsman. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

6.5 Art Deco. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

6.6 California Contemporary. . . . . . . . . . . . . . . . . . . . . . . . 97

7. Glossary of Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 iv