Local zoning · Alhambra

Alhambra — Overlay Districts

Q: What is the difference between the -WMC and -PD overlays in Alhambra?

The -WMC overlay implements the West Main Corridor Master Plan and requires all development in the mapped corridor to be consistent with that Master Plan § 23.10.020–030 . The -PD overlay is a flexible Planned Development tool that lets a property be developed according to a site-specific PD Plan (subject to Council approval, required findings, and minimum area rules) § 23.11.010–050 .

Q: What are the numeric requirements for a PD Overlay (lot size, time limits)?

The PD chapter sets a minimum area of 1 acre for a PD Overlay (the Council can approve smaller areas when justified) § 23.11.040(A) . An approved PD Plan typically expires after 2 years unless construction is underway or other conditions in the PD are met; extensions can be administratively approved for up to two years § 23.11.080 .

Q: Does an overlay replace base-zone setbacks and parking?

Not automatically. For -PD , the PD Plan prescribes development standards; where the PD Plan is silent the base zoning development standards apply § 23.11.040(C) . For -WMC , the Code requires consistency with the Master Plan; numeric rules (setbacks, parking) are enforced as written in the Master Plan or by reference in that overlay. Always compare the overlay document to the base-zone rules and check Alhambra Parking and Alhambra Development Standards .

Q: How are PD Plan amendments handled?

Amendments are classified as major or minor . Major amendments (e.g., boundary changes, material changes in density or land use) require a City Council public hearing; minor amendments consistent with original approvals may be processed administratively by the Community Development Director § 23.11.090 .

Overlay Districts under the Alhambra local zoning and planning code, with the controlling citations.

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Last reviewed: July 3, 2026

Overview

Overlay districts in Alhambra are special zoning layers that sit on top of the city's base zoning and either modify or add rules for a defined area. The Alhambra Zoning Code establishes two overlay district types in the code: the West Main Corridor Master Plan (-WMC) and the Planned Development (-PD) overlay; each has its own purpose, mapping rules, and procedures. Confirm whether an overlay applies to a parcel on the official zoning map before assuming base-zone rules; the Code explicitly ties overlay requirements to adopted plans and PD Plans and defers to base-zone standards where the overlay is silent.

Note: this page explains only what the Alhambra Zoning Code says about overlays. For related topics you will likely need to consult other pages such as the city's Alhambra Design Review, Alhambra Parking, Alhambra Development Standards, Alhambra ADUs, and the California Building Standards Code where those rules are fully described.

How Alhambra structures overlays (legal summary)

Overlays are listed in the Zoning District table as distinct overlay zone symbols (Table 23.03.010); Alhambra currently shows -WMC and -PD as overlay symbols.
Overlay boundaries are shown on the official Zoning Map; if a boundary is unclear the Director determines exact boundaries per the code.
An overlay is applied “in combination with a base zone” — meaning the base zone’s uses and standards still matter unless the overlay explicitly replaces them.

West Main Corridor Master Plan (-WMC) Overlay District

Purpose

The -WMC exists to implement the West Main Corridor Master Plan; it binds "all use and development" in its mapped area to the Master Plan's goals, objectives, and design requirements. § 23.10.010–030.

Where it applies

The -WMC applies to properties within the mapped West Main Corridor Master Planning boundary shown on the official Zoning Map. Confirm parcel mapping on the official map. § 23.10.020; see rules on the official map and boundary interpretation in § 23.03.020.

Typical permitted uses (practical guidance)

The Zoning Code requires that "all development within the -WMC Overlay District shall be consistent with the goals, objectives, and design requirements of the West Main Corridor Master Plan" § 23.10.030. The specific list of permitted uses and numeric standards for -WMC are contained in the West Main Corridor Master Plan document itself, not fully enumerated in the excerpted zoning code available here. Not found in retrieved materials: a parcel-level list of permitted uses or numeric setbacks specific to -WMC. Verify with the West Main Corridor Master Plan and the City.

Key dimensional/development guidance

The code instructs consistency with the Master Plan; explicit dimensional standards for the -WMC area (FAR, height, setbacks) are established in the Master Plan or in site-specific overlay language when adopted. Not found in retrieved materials: overlay-specific numeric standards for -WMC. Verify with the Master Plan. § 23.10.030.

Practical tips

Always pull the West Main Corridor Master Plan exhibit and design guidelines. Because the overlay ties development to that document, things like build-to lines, frontage improvements, or special height rules will live in the Master Plan or in the city's specific plan documents — not duplicated in the generic overlay chapter. Confirm whether design review or sign programs are required via the Master Plan and the city's Design Review regulations.

Planned Development (-PD) Overlay District

Purpose

The -PD is intended to allow one or more properties to be developed under a coordinated plan with tailored development standards that respond to site conditions and provide flexibility relative to strict application of base zone rules. § 23.11.010.

Where it applies / mapping

A -PD is shown on the zoning map by adding the suffix -PD to the base zone (for example, RM-PD). § 23.11.020.

Land uses and flexibility

No use other than an existing use is permitted in a -PD unless the property is governed by a valid PD Plan. Any use allowed elsewhere in the code (permitted or conditional) can be included in an approved PD Plan provided it is consistent with the General Plan. § 23.11.030.

Key numeric and procedural standards (decision‑relevant)

Minimum area: 1 acre for a -PD, unless the City Council finds a smaller area provides greater public benefit. § 23.11.040(A).
Residential unit density: total residential units in a -PD cannot exceed the maximum permitted by the General Plan density for the area (except when a density bonus applies under Chapter 23.14). § 23.11.040(B).
Other standards: the PD Plan prescribes other development standards; where the PD Plan is silent, the base zoning district's development standards apply. § 23.11.040(C).

Review and adoption process

Adoption of a -PD requires City Council action after a public hearing before the Planning Commission; the Planning Commission makes a recommendation. § 23.11.050(A). The PD Overlay District is processed as a zoning map amendment and requires a PD Plan; the PD Plan is processed in the same manner as a Conditional Use Permit but with final review by the City Council. § 23.11.050(B)(1–2).

Time limits, amendments, and extensions

A PD Plan generally expires two years after its effective date unless specified actions or building permits have been obtained and construction is being diligently pursued; extensions may be approved by the Community Development Director for up to two years when circumstances have not substantially changed. § 23.11.080(A)–(B).
Amendments may be classified as major or minor; major amendments (e.g., boundary changes or material density/land-use changes) require a City Council public hearing; minor amendments may be approved administratively. § 23.11.090(A)–(C).

Practical tips

If a property is designated -PD, you must obtain a PD Plan consistent with the PD chapter; do not assume you can swap uses in or out without approval. Confirm required findings (see § 23.11.060) and application requirements early in pre-application meetings. Permit timelines, expiration, and amendment thresholds are strict and can require Council hearings.

Decision‑relevant summary table

Topic	Key rule / number (bolded)	Code Reference
Overlay districts listed in code	-WMC, -PD	§ 23.03.010, Table 23.03.010
WMC applicability	Applies to all development in West Main Corridor mapped area	§ 23.10.020–030
PD map designation	Add -PD suffix to base zone (e.g., RM-PD)	§ 23.11.020
PD minimum area	1 acre (Council may approve smaller)	§ 23.11.040(A)
PD density limit	Max units limited to General Plan density (unless density bonus)	§ 23.11.040(B); see Chapter 23.14 for density bonuses
PD review authority	Planning Commission hearing; adoption by City Council	§ 23.11.050(A–B)
PD expiration	PD Plan expires 2 years unless conditions met; extensions possible	§ 23.11.080(A–B)
Where to confirm mapping	Official Zoning Map / Director to resolve boundary uncertainty	§ 23.03.020

Checklist — what an applicant must do before filing (quick)

Confirm whether the parcel is in an overlay (check the official Zoning Map and verify boundary interpretation under § 23.03.020) .
If the parcel is in -WMC, obtain and follow the West Main Corridor Master Plan documents and design requirements (all development must be consistent with the Master Plan) § 23.10.030.
If seeking a -PD, prepare a complete PD Plan and fee package, and be ready for a Planning Commission public hearing and City Council adoption per § 23.11.050.
Confirm required PD Plan findings (see § 23.11.060) and include any supporting studies (traffic, utilities, etc.). If the text of the findings is not in the materials you have, verify with the Planning Division.
Check whether the PD Plan alters base-zone development standards or defers to them where the PD is silent (§ 23.11.040(C)).
Where applicable, submit a design review application with your discretionary permit package (see timing rules in § 23.33.040) and confirm parking and frontage requirements with the Alhambra Design Review and Alhambra Parking rules.
Note PD Plan expiration (usually 2 years). If you expect phased construction, either request phasing authority or plan to apply for extensions per § 23.11.080.

Risks & Ambiguities

Issue	Why it matters	What to verify
Lack of WMC numeric standards in the code extracts	You may assume wrong setbacks, heights, or allowed uses and design elements	Obtain the West Main Corridor Master Plan document and consult § 23.10.030; verify numeric standards in the Master Plan or its implementing exhibits.
PD required findings text	Applications can be rejected if you don’t demonstrate required findings	Check § 23.11.060 for required findings; if the full text is missing from your materials, request the exact language from the Planning Division.
Overlay vs. base-zone conflict	Decision‑makers will apply the more specific control; assuming base-zone rules apply can cost rework	Where overlay is silent, PD defers to base zone (§ 23.11.040(C)); for -WMC the Code only mandates consistency with the Master Plan — verify which document controls each standard.
Boundary uncertainty	Mis-reading a boundary can change applicable standards entirely	Confirm mapping on the official Zoning Map and use § 23.03.020 rules for interpreting boundaries; ask the Director to resolve ambiguous boundaries.
Timing and expiration traps	PD Plans expire (usually 2 years) and amendments may require Council hearings	Confirm project phasing, building-permit triggers, and extension authority under § 23.11.080 and amendment thresholds under § 23.11.090.

Plain‑English summary

If your property is in an Alhambra overlay, the overlay rules sit on top of the base zone: the West Main Corridor (-WMC) forces projects to follow its Master Plan, and the Planned Development (-PD) lets you build under a custom PD Plan (minimum 1 acre, Council approval and specific findings required). When the overlay doesn’t say otherwise, the base zoning and the city’s development standards apply — always verify mapping and the applicable Master Plan or PD Plan before you design or file.

Source References

Alhambra Zoning Code, Table 23.03.010 (Base zoning districts, Specific Plan districts, and Overlay districts)
CHAPTER 23.10 — West Main Corridor Master Plan (-WMC) Overlay District: § 23.10.010–030 (purpose, applicability, consistency requirement)
CHAPTER 23.11 — Planned Development (-PD) Overlay District: § 23.11.010–110 (purpose, map designation § 23.11.020, land use § 23.11.030, development standards § 23.11.040, procedures § 23.11.050, expiration § 23.11.080, amendments § 23.11.090)
Official Zoning Map and district boundary interpretation: § 23.03.020
Design review timing and scope (relevant to overlay projects requiring discretionary approval): § 23.33.040–070
Cross-reference: Affordable housing/density bonus rules (affecting PD density calculations): Chapter 23.14 (density bonus provisions)

Sources

Retrieved passages

Alhambra Zoning Code (§ 23.11.020) High relevance
Alhambra Zoning Code (§ 23.03.020) High relevance
Alhambra Zoning Code (CHAPTER 23.10) High relevance
Alhambra Zoning Code (§ 23.01.040) Medium relevance
CBC § 23.12.040 (§ 23.12.040) Medium relevance
CFC § 66333 (chapter as) Medium relevance
Alhambra Zoning Code (§ 23.11.080) Medium relevance
Alhambra Zoning Code (§ 23.08.030) Medium relevance

Cited sections

Official Alhambra code library

Frequently asked questions

What is the difference between the -WMC and -PD overlays in Alhambra?

The -WMC overlay implements the West Main Corridor Master Plan and requires all development in the mapped corridor to be consistent with that Master Plan § 23.10.020–030. The -PD overlay is a flexible Planned Development tool that lets a property be developed according to a site-specific PD Plan (subject to Council approval, required findings, and minimum area rules) § 23.11.010–050.

How do I know if my lot is inside an overlay district?

Check the official Zoning Map maintained by the City Clerk and use the boundary interpretation rules in § 23.03.020; if there is uncertainty the Director resolves the exact boundary location. If the map shows a suffix like -PD or -WMC appended to a base zone, that overlay applies.

If my property is -PD, what uses can I have there?

By default, no use other than an existing use is permitted in a -PD unless the property has a valid PD Plan. Any use that is permitted or conditionally allowed in the Zoning Code may be included in an approved PD Plan provided it is consistent with the General Plan § 23.11.030. Confirm the PD Plan text for your parcel to know the approved uses.

What are the numeric requirements for a PD Overlay (lot size, time limits)?

The PD chapter sets a minimum area of 1 acre for a PD Overlay (the Council can approve smaller areas when justified) § 23.11.040(A). An approved PD Plan typically expires after 2 years unless construction is underway or other conditions in the PD are met; extensions can be administratively approved for up to two years § 23.11.080.

Does an overlay replace base-zone setbacks and parking?

Not automatically. For -PD, the PD Plan prescribes development standards; where the PD Plan is silent the base zoning development standards apply § 23.11.040(C). For -WMC, the Code requires consistency with the Master Plan; numeric rules (setbacks, parking) are enforced as written in the Master Plan or by reference in that overlay. Always compare the overlay document to the base-zone rules and check Alhambra Parking and Alhambra Development Standards.

Will a PD Plan require public hearings and Council approval?

Yes. A PD Overlay District is adopted by City Council after a public hearing before the Planning Commission; the PD Plan is processed as a Conditional Use Permit equivalent with the Council as the review authority § 23.11.050(A–B).

If the overlay is silent about a standard (height, FAR), which standard controls?

If the PD Plan is silent about a particular standard, the applicable base zoning district standard applies § 23.11.040(C). For other overlays (such as -WMC) the code requires consistency with the overlay plan; where the overlay doesn't specify, you must verify whether the Master Plan or base zone governs (Not found in retrieved materials for a general rule — confirm with the City).

Do I need to file design review with an overlay application?

If your project requires discretionary approval (PD Plan, conditional use, etc.), design review must be submitted with those applications and is timed per the design review rules; see § 23.33.040 for design review timing and coordination with discretionary permits.

How are PD Plan amendments handled?

Amendments are classified as major or minor. Major amendments (e.g., boundary changes, material changes in density or land use) require a City Council public hearing; minor amendments consistent with original approvals may be processed administratively by the Community Development Director § 23.11.090.

If I want to build an ADU in an overlay area, do overlay rules apply?

Overlay rules apply to "all development" in the overlay area, but ADU-specific state rules and the city's ADU provisions still control where applicable. Check the overlay document, the city's ADU chapter, and Alhambra ADUs; if overlay standards conflict with mandatory state ADU rules, verify with the Planning Division and state law. Not all ADU-specific rules are in the overlay chapters retrievable here.

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