Alameda — Overlay Districts

Last reviewed: July 3, 2026

Overview

Alameda’s zoning code uses combining/overlay districts (called Combining Districts in the ordinance) to modify or add rules on top of an underlying base zone — for example to require mixed‑use, permit transit‑oriented multifamily, impose special yard or height rules, or to establish planned developments. The combining districts and their rules are adopted as part of Chapter XXX — Development Regulations and are shown on the City’s zoning maps. See the City’s zoning overview and development standards for where these interact with base rules and procedures. § 30-3.2

Note on internal links used in this page: when you see terms such as parking, design review, ADUs, Alameda Zoning, Alameda Development Standards, Alameda Historic Preservation, and California Building Standards Code / Title 24 they link to the City / topic pages you’ll use in an application.

What Alameda calls "overlays": the Combining (Overlay) Districts

The code lists the combining/overlay districts by map symbol in § 30-3.2 and then defines each combining district in Article IV (Districts and Regulations). The principal combining districts you will encounter in Alameda (and the sections that control them) include the following: PD, A, B, H, G, Y, T, MF, CMU. § 30-3.2

For each district below I give (A) purpose, (B) typical permitted uses or special permission rules, (C) the most decision‑relevant dimensional/approval standards, and (D) where it applies / how it interacts with the underlying zone. Every requirement below is quoted by its controlling code §.

PD — Planned Development Combining District (PD)

• Purpose: Provide flexibility for large or complex projects and ensure master plan quality and compatibility. § 30-4.13
• Typical uses: Uses allowed are derived from the underlying district plus any uses the City Council approves as part of the PD master plan; yacht clubs and other specified uses may be allowed with findings. § 30-4.13.d
• Key standards / approvals: PDs require a Master Plan/Development Plan and Planning Board and City Council approvals; minimum acreage standard normally applies (generally 2 acres unless exceptions granted). § 30-4.13.c
• Interaction: PD provisions combine with the underlying zoning; where there is conflict the PD provisions govern. § 30-4.13.b

A — Agricultural Combining District (A)

• Purpose: Allow limited agricultural operations where combined with another district. § 30-4.14.a
• Typical uses: Normal uses of the underlying district plus limited animal husbandry and crop/tree farming; certain agricultural uses may require a use permit. § 30-4.14.b–c
• Key standards: Special yard distances for barns/stables and limits on number of large animals per acreage. § 30-4.14.d
• Interaction: A adds agricultural exceptions to the base zone rules and supersedes conflicting provisions. § 30-4.14.a

B — Special Building Site Combining District (B)

• Purpose: Apply special site area / yard rules where lot configuration demands it. § 30-4.15.a
• Typical uses: Uses of the underlying district remain; the B designation modifies lot size/building site area requirements. § 30-4.15.b
• Key standards: Building site area (expressed as a number following the B), side yard minimums (10% of lot width, with caps and minimums). § 30-4.15.b.1–2

H — Special Height Combining District (H)

• Purpose: Apply site‑specific maximum height limits indicated by an “H” followed by feet. § 30-4.16.a–b
• Typical effect: Overrides the base district height where a special height limit is shown. § 30-4.16.b.1

G — Special Government Combining District (G)

• Purpose: Applied where lands are owned/used by governmental entities and need special treatment. § 30-4.17
• Typical uses and standards: The G designation clarifies permitted public uses and how other zoning rules apply; see the G section for site‑specific rules. § 30-4.17

Y — Special Yard Combining District (Y)

• Purpose: Establishes special front/side/rear yard depths where unique topography, waterways, or future right‑of‑way widening require different yards. § 30-4.18.a
• Key standards: Yf, Ys, Yr notation indicates which yard and the numeric depth in feet; when Yf yields a front yard less than standard, additional unenclosed parking may be required. § 30-4.18.a–b

T — Theatre Combining District (T)

• Purpose: Allow and regulate theaters and places of public assembly where overlaid on other districts. § 30-4.22.a
• Uses: Auditoria, movie/live theaters, other public assembly uses; all uses allowed in the underlying district are retained. § 30-4.22.b–c
• Special rules: Parking findings and coordinated signage program requirements accompany T district approvals. § 30-4.22.d–e

MF — Multi‑family Residential Combining District (MF)

• Purpose: An overlay to promote transit‑oriented multi‑family housing and help meet regional housing obligations. § 30-4.23.a
• Typical permitted uses: Multifamily dwellings, transitional and supportive housing, shared living, residential care facilities — these are permitted by right without conditional use if MF conditions met (design review still applies). § 30-4.23.c–d
• Key standards:
  • Minimum residential density for new buildings: 30 dwelling units/acre. § 30-4.23.e.1
  • Maximum height: 65′ unless the underlying district allows more; special adjacency limit within 20′ of a residential district. § 30-4.23.f
  • Off‑street parking: comply with § 30-7 (see parking rules). § 30-4.23.g
• Interaction: MF controls over conflicting underlying rules; residential projects in MF typically are limited to design review findings in § 30-37.5 rather than discretionary use permits. § 30-4.23.b.1, 30-4.23.h

CMU — Community Mixed Use Combining District (CMU)

• Purpose: Enable multifamily + mixed use only where a site already anchors community‑serving commercial (explicit grocery requirement). § 30-4.26.a–c
• Typical permitted uses: Ground floor commercial required on certain streets; residential uses allowed by right if commercial and frontage requirements are met (design review still applies). § 30-4.26.d–e
• Key standards:
  • Minimum on‑site commercial (including a grocery ≥ 20,000 sq ft) and a per‑acre retail floor area ratio (for the specific subdistricts listed). § 30-4.26.c
  • Minimum residential density: 30 du/acre; maximum residential density: none. § 30-4.26.g–f
  • Building height limit: 65′ unless the underlying district provides more. § 30-4.26.h
  • Ground‑floor commercial depth requirement: 30′ minimum on listed frontages. § 30-4.26.d
• Interaction: CMU supersedes conflicts with the underlying zoning; residential approvals limited to design review findings per § 30-37.5. § 30-4.26.b, 30-4.26.g

District standards at a glance (decision‑relevant table)

How the overlays interact with other rules (practical guidance)

• The combining district language generally states that when there is a conflict between the combining district and the underlying zoning or other AMC provisions, the combining district governs. See § 30-4.23.b.1 (MF) and § 30-4.26.b (CMU) for examples. § 30-4.23.b.1 § 30-4.26.b
• Design review still applies in many combining districts; for MF and CMU residential projects review is typically limited to the design review findings in § 30-37.5 rather than a discretionary use permit. § 30-4.23.h; § 30-4.26.g; § 30-37.5
• Off‑street parking follows § 30-7; several combining districts explicitly point applicants back to Section 30-7 for parking and loading requirements. When the combining district alters development intensity (e.g., higher density in MF/CMU), expect parking consequences and check the parking rules in the municipal code for specifics. § 30-4.23.g; § 30-4.26.4
• Accessory Dwelling Units remain subject to the ADU rules (see § 30-5.18) even where a combining district applies; check the ADU chapter for process and objective standards. § 30-5.18

(If you need to confirm precise off‑street parking counts or ADU ministerial thresholds, consult the Alameda Parking and ADU pages and the specific code sections cited above.)

Checklist (what an applicant should do before filing)

• Verify the parcel’s zoning and any combining district symbol on the City Zoning Map; boundaries are adopted with the zoning map. § 30-3.3
• Read the combining district text that applies (e.g., § 30-4.23 for MF, § 30-4.26 for CMU) and note any overriding standards. § 30-4.23; § 30-4.26
• Confirm minimum/required commercial floor area (CMU) or density minimums (MF) and whether your proposal meets them. § 30-4.26.c; § 30-4.23.e
• Prepare to meet design review submittal requirements (see § 30-37.3 and the Design Review Manual) and the findings in § 30-37.5. § 30-37.3; § 30-37.5
• Run a parking analysis against § 30-7 if density or use will change; coordinate with the parking rules. § 30-4.23.g; § 30-7
• If the site is within Alameda Point or North Park Street districts, read the district‑specific subdistrict tables (AP, NP) for frontage, building form and height limits. § 30-4.24; § 30-4.25
• Check affordable housing requirements and linkage to § 30-16 if residential. § 30-4.23.k; § 30-16
• If the property is historic or within the NAS Alameda Historic District, consult the historic preservation rules and the Cultural Landscape Guidelines. § 30-4.24.e; Historic rules

Risks & Ambiguities

Plain‑English summary

Alameda’s “overlay” rules are the combining districts in the zoning code (the PD, MF, CMU, Y, H, B, T, A, G, and similar designations). They change or add to the base zoning for parcels shown on the zoning map — for example, MF and CMU make it easier to build multifamily housing (with required densities or commercial anchors), Y changes yard depths, H sets site‑specific height caps, and PD allows project‑level master plans. Always check the exact combining district section in Chapter XXX for the parcel and use the design review, parking, and affordable housing code sections noted in the district text. § 30-3.2; § 30-4.23; § 30-4.26; § 30-4.13

Information Gaps

• Exact parcel‑level overlay designation and precise map boundary placement: Not found in retrieved materials (verify with the zoning map maintained by the City Clerk as required by § 30-3.3). § 30-3.3
• Project‑level interpretation of whether an existing grocery store meets the CMU grocery requirement for an application: Not specifically addressed in the CMU text — Verify with Planning staff. § 30-4.26.c
• Any local administrative forms, checklists, or objective design standards used by Design Review Staff beyond the code text: partial references exist (Design Review Manual) but the exact checklists are not included in the retrieved files — Verify with Design Review Staff. § 30-37.3

Source References

• Combining districts list and general rules: § 30-3.2
• PD, Planned Development: § 30-4.13
• A, Agricultural combining district: § 30-4.14
• B, Special Building Site combining district: § 30-4.15
• H, Special Height combining district: § 30-4.16
• G, Special Government combining district: § 30-4.17
• Y, Special Yard combining district: § 30-4.18
• T, Theatre combining district: § 30-4.22
• MF, Multi‑family Residential combining district: § 30-4.23
• CMU, Community Mixed Use combining district: § 30-4.26
• Alameda Point district (district‑specific subdistricts and standards): § 30-4.24
• North Park Street District: § 30-4.25
• Design review application and findings: § 30-37.3; § 30-37.5
• Off‑street parking cross‑references: § 30-7 (referenced from combining district text)
• Accessory dwelling units: § 30-5.18 (cited in district tables)

(Primary source: City of Alameda, Chapter XXX — Development Regulations (Zoning) — municode print export included in the uploaded materials.)

Retrieved passages

• Alameda Zoning Code (§ 11-114) Medium relevance show source text
• Alameda Zoning Code (Article 26) Medium relevance show source text
• Alameda Zoning Code (Section 30-7) Medium relevance show source text
• Alameda Zoning Code (§ 1) Medium relevance show source text
• Alameda Zoning Code (§ 1) Medium relevance show source text
• CBC § 13 (section above) Medium relevance show source text
• Alameda Zoning Code (§ 2) Medium relevance show source text
• Alameda Zoning Code Medium relevance show source text
• Alameda Zoning Code (Section 30-21.3) Medium relevance show source text
• Alameda Zoning Code (Section 30-21.3) Medium relevance show source text
• Alameda Zoning Code (Section 30-7) Medium relevance show source text
• Alameda Zoning Code (§ 11-1359) Medium relevance show source text
• Alameda Zoning Code (§ 1) Medium relevance show source text
• Alameda Zoning Code (§ 11) Medium relevance show source text
• Alameda Zoning Code (§ 1) Medium relevance show source text

Cited sections

• Combining districts list and general rules: **§ 30-3.2** (§ 30-3.2)
• PD, Planned Development: **§ 30-4.13** (§ 30-4.13)
• A, Agricultural combining district: **§ 30-4.14** (§ 30-4.14)
• B, Special Building Site combining district: **§ 30-4.15** (§ 30-4.15)
• H, Special Height combining district: **§ 30-4.16** (§ 30-4.16)
• G, Special Government combining district: **§ 30-4.17** (§ 30-4.17)
• Y, Special Yard combining district: **§ 30-4.18** (§ 30-4.18)
• T, Theatre combining district: **§ 30-4.22** (§ 30-4.22)
• MF, Multi‑family Residential combining district: **§ 30-4.23** (§ 30-4.23)
• CMU, Community Mixed Use combining district: **§ 30-4.26** (§ 30-4.26)
• Alameda Point district (district‑specific subdistricts and standards): **§ 30-4.24** (§ 30-4.24)
• North Park Street District: **§ 30-4.25** (§ 30-4.25)
• Design review application and findings: **§ 30-37.3; § 30-37.5** (§ 30-37.3)
• Off‑street parking cross‑references: **§ 30-7** (referenced from combining district text) (§ 30-7)
• Accessory dwelling units: **§ 30-5.18** (cited in district tables) (§ 30-5.18)
• Alameda_ZoningCode.md

• Official Alameda code library