Local zoning · Foster City
Foster City — Historic Preservation
Historic Preservation under the Foster City local zoning and planning code, with the controlling citations.
Last reviewed: July 2, 2026
Overview
Foster City does not have a standalone "historic preservation" chapter in Title 17; instead preservation is implemented through the city’s architectural review regime, nonconforming/demolition controls, and project-specific design and conversion rules found across Title 17. Key tools that affect historic resources are architectural control and supervision (design review), nonconforming-building rules, conversion/demolition limits, and SB 9 eligibility exclusions for parcels inside local historic districts or listed state inventories. See the city’s design review and development standards for how preservation concerns are applied in practice. (See § 17.58.010–.070, § 17.70.040–.060, § 17.76.040(B)(6), § 17.79.040)
How the Foster City code handles “historic preservation” (practical summary)
Architectural review is the primary local tool for preserving character: the City requires review of most exterior changes so proposals “preserve the architectural character and scale” and be compatible with adjacent properties (see § 17.58.010 and § 17.58.020) . The findings required before approval are listed in § 17.58.050.
Nonconforming-building rules protect older buildings from automatic loss but limit alterations: a building that is nonconforming may be maintained and repaired, but enlargements or structural changes must comply with current district rules unless specific exceptions apply (§ 17.70.040–.060) .
Demolition / conversion controls: for residential conversions and similar projects the code requires tenant protections and includes an explicit demolition restriction: “No permit to demolish a residential building in any zoning district shall be issued until a building permit for the replacement structure is approved,” subject to state‑law conditions (§ 17.76.040(B)(6)). That rule functionally prevents demolition of potentially historic housing without replacement planning and tenant protections.
State-law and SB 9 intersection: Foster City’s SB 9 implementation excludes parcels that are in a historic district or listed on the State Historic Resources Inventory or designated as a city landmark or historic property by local ordinance (see § 17.79.040(A)(6)). That means property-level eligibility for ministerial SB 9 benefits can be blocked where local historic designation or state listing applies.
Design standards for multifamily projects (Chapter 17.96) explicitly aim to “blend into the character of the adjacent neighborhood,” which is an important channel for preserving character when redevelopment is proposed (§ 17.96.010–.030).
Practical cross-references you will encounter during review: the city applies its objective design standards and architectural guidelines during approvals (see § 17.58.060) and refers to parking, setback, and other development rules while judging compatibility (see the Development Standards and Parking chapters). For details consult the code chapters cited above and the city’s design-review guidance.
(For the city pages developers and property owners typically consult: the Foster City design review page, the development standards page, and the parking page.)
District-by-district breakdown (how preservation review interacts with the zoning districts)
Below are district-specific notes focused on how Title 17’s preservation‑relevant rules apply. Where a district chapter is cited, that chapter describes permitted uses and the area/bulk rules the architectural-review process will use to judge compatibility.
R-1 (Single‑Family Residence district)
- Purpose & where it applies: base single‑family neighborhoods (SB 9 and two‑unit rules explicitly reference R-1 parcels) — see § 17.79.020 for SB 9 applicability.
- Typical permitted uses: single‑family dwellings, ADUs consistent with Chapter 17.78.
- Key preservation controls: most exterior improvements in R districts are subject to architectural review unless expressly exempt; § 17.58.020 lists improvements subject to review (new buildings, exterior modifications, decks, etc.). Setback averaging and existing-improvement exceptions for previously‑developed blocks are in § 17.54.070 and setback modification rules are in § 17.54.080.
R-1/PD (R-1 with Planned Development combining district)
- Purpose: same residential character but projects processed with PD review so design review and development agreements can impose special guidelines.
- Typical uses and standards: R-1 rules plus PD conditions; architectural review triggers are the same and the PD may adopt stricter design rules (see § 17.58.060 for architectural guidelines authority).
C-O (Commercial Office district)
- Purpose & where: commercial office areas (see Chapter 17.22).
- Typical permitted uses: administrative/professional offices and subordinate accessory uses under § 17.22.020. Area/bulk and setbacks used in evaluating compatibility are in § 17.22.040 (area/bulk/yards and height). Design review (Chapter 17.58) applies to exterior changes visible from public areas.
C-1 (Neighborhood Commercial)
- Purpose: neighborhood-serving retail/commercial (see § 17.24.020 and § 17.24.040 for area/bulk). Architectural review will examine façade, materials, signage and compatibility under § 17.58.010–.050.
C-2 (General Business)
- Purpose & typical uses: broader commercial services; area/bulk rules and design standards are in Chapter 17.26 and design review is required for exterior modifications. When commercial abuts residential, minimum separation distances are spelled out in the commercial tables.
P-F (Public Facilities)
- Purpose: public buildings, institutions and related housing types (see § 17.32.020 for permitted uses, including certain housing and accessory dwellings). Projects will still be reviewed under architectural control when improvements affect exterior appearance or neighborhood character.
OSC (Open Space & Conservation)
- Purpose: open space and parklands where building is limited; conversion or demolition of structures in OSC triggers special review and, where allowed, tight controls (see Chapter 17.34).
Note: the architectural review chapter explicitly allows the planning commission to adopt project- or area‑specific architectural guidelines that can supersede broader Title 17 provisions when the guidelines differ (§ 17.58.060) — a mechanism commonly used to protect neighborhood character or recognized historic resources.
Decision‑relevant quick reference table
| Topic / Decision point | Quick rule (plain) | Code reference |
|---|---|---|
| Which exterior changes require review | Most exterior improvements — new buildings, exterior modifications (windows, roofs, decks), paved front yards — are subject to architectural review (not just large projects). | § 17.58.020 |
| Findings needed to approve design | Proposal must be consistent with General Plan and Title 17 and conform to adopted objective design standards/guidelines. | § 17.58.050 |
| Nonconforming building work limit | Nonconforming buildings may be maintained; enlargements/structural alterations must comply with district regs; special restoration rules for pre‑1972 dwellings exist. | § 17.70.040–.060 |
| Demolition of residential buildings | Demolition permits for residential buildings are withheld until a replacement building permit is approved (with statutory tenant/affordability protections). | § 17.76.040(B)(6) |
| SB 9 (two-unit/lot‑split) historic exclusion | Parcels inside local historic districts, city landmarks, or on the State Historic Resources Inventory are excluded from SB 9 eligibility. | § 17.79.040(A)(6) |
| Objective design standards for multifamily | Multifamily projects must meet Chapter 17.96 objective design & development standards to protect neighborhood character. | § 17.96.010–.030 |
| ADUs on historic properties | ADUs are permitted in residential zones; local objective standards may apply to avoid adverse impacts on historic properties (see ADU chapter). | Chapter 17.78; see California guidance on ADUs and historic resources in state law. |
Checklist (what an applicant proposing exterior work on an older resource must satisfy)
- Confirm zoning district and any overlays affecting the parcel (e.g., PD overlays). Verify via the zoning map and Chapter 17.08.
- Determine whether the parcel is listed as a city landmark or in a local historic district or on the State Historic Resources Inventory (if yes, SB 9 and some ministerial pathways are not available) — see § 17.79.040(A)(6).
- Prepare plans showing all exterior changes; identify elements from § 17.58.020 that trigger architectural review and submit with the planning application.
- For demolition or conversion work, include tenant‑protection and replacement‑unit plans as required by § 17.76.040; anticipate that demolition permits will be withheld until replacement permits are approved.
- Demonstrate consistency with the city’s objective design standards (Chapter 17.96) when applicable, and be prepared for planning commission review and findings under § 17.58.050.
- Check parking impacts and off‑street parking requirements early (Chapter 17.62) — parking can affect design decisions for additions and conversions. See the city parking page for local process.
- If proposing signage or changes visible from the public right‑of‑way, factor in Chapter 17.59 sign rules and design‑review timing.
Risks & Ambiguities
| Issue | Why it matters | What to verify |
|---|---|---|
| Is the property a local “landmark” or in a local historic district? | If yes, SB 9 and some ministerial processes are blocked and discretionary review is more likely. | Verify local historic designations and the city’s register; confirm against § 17.79.040(A)(6). |
| Which exterior changes are “exempt” vs. subject to architectural review? | Small work may be exempt; larger or visible work almost always triggers review and findings. | Cross‑check proposed changes with § 17.58.020(B) exemptions and confirm with the planning director. |
| Is a demolition permit blocked by replacement/tenant rules? | Demolition may be delayed until replacement permitting and statutory tenant protections are satisfied. | Confirm applicability of § 17.76.040(B)(6) and any Chapter 17.90 affordability/relocation requirements. |
| Conflicts between PD‑adopted guidelines and Title 17 tables | PD guidelines can supersede Title 17 numeric standards — this can change allowable setbacks, materials, etc. | Review adopted PD resolution or architectural guidelines per § 17.58.060. |
| ADU compatibility with historic fabric | ADUs are allowed, but local objective standards may be applied to prevent adverse impacts. | Confirm ADU rules in Chapter 17.78 and applicable design standards; see state ADU guidance on historic resources. |
Plain‑English summary
Foster City protects neighborhood and waterfront character through an active architectural‑review process and limits on demolition and conversion; most exterior changes to older buildings need architectural review, demolition usually requires an approved replacement plan, and parcels in local or state historic listings are treated specially and may be excluded from ministerial statewide pathways like SB 9. Verify designation status and follow Chapters 17.58, 17.70, 17.76, and 17.79 early in project planning.
Source References
- Foster City Municipal Code — Chapter 17.58, Architectural Control and Supervision: § 17.58.010–.070 (intent, improvements subject to review, findings)
- Foster City Municipal Code — Chapter 17.70, Nonconformity Uses: § 17.70.040–.060 (alterations, permits, destruction/restoration)
- Foster City Municipal Code — Chapter 17.76, Conversion Regulations (tenant protections and demolition constraints): § 17.76.040(B)(6) (demolition permit restriction)
- Foster City Municipal Code — SB 9 / Two‑Unit Development chapter: § 17.79.040(A)(6) (historic district / city landmark exclusion) and related SB 9 standards (§ 17.79.020, § 17.79.060)
- Foster City Municipal Code — Chapter 17.96, Multifamily and Residential Mixed‑Use Objective Design and Development Standards: § 17.96.010–.030 (applicability and process)
- Foster City Municipal Code — ADU chapter: Chapter 17.78 (ADU standards and applicability)
- Foster City Municipal Code — Off‑street Parking: Chapter 17.62 (parking requirements affecting design)
- Foster City Municipal Code — Sign control, Chapter 17.59 (signage & review interface)
Sources
Retrieved passages
- Foster City Zoning Code (Title 17) Medium relevance
- Foster City Zoning Code (§ 4) Medium relevance
- Foster City Zoning Code (chapter will) Medium relevance
- Foster City Zoning Code (Chapter 17.82.) Medium relevance
- Foster City Zoning Code (chapter establishes) Medium relevance
- Foster City Zoning Code (§ 1) Medium relevance
- Foster City Zoning Code (§ 10-410.010) Medium relevance
- Foster City Zoning Code (chapter is) Medium relevance
- Foster City Zoning Code (Chapter 17.58) High relevance
- Foster City Zoning Code (§ 2) High relevance
- CBC § 3 (§ 3) Medium relevance
- Foster City Zoning Code (Section 60.3) Medium relevance
- Foster City Zoning Code (Section 17.06.140) Medium relevance
- Foster City Zoning Code (Section 25250.11) Medium relevance
- CFC § 2 (Section 17920.3) Medium relevance
- Foster City Zoning Code (Chapter 17.70) Medium relevance
- Foster City Zoning Code (§ 2) Medium relevance
- Foster City Zoning Code (§ 2) Medium relevance
- Foster City Zoning Code (§ 2) Medium relevance
- Foster City Zoning Code (§ 2) Medium relevance
- CBC § 3 (Section 66300) Medium relevance
- Foster City Zoning Code (chapter deprives) Medium relevance
- Foster City Zoning Code (§ 1) Medium relevance
- Foster City Zoning Code (Section 17.90.150.) Medium relevance
Cited sections
- Foster City Municipal Code — Chapter 17.58, Architectural Control and Supervision: **§ 17.58.010–.070** (intent, improvements subject to review, findings) (Chapter 17.58)
- Foster City Municipal Code — Chapter 17.70, Nonconformity Uses: **§ 17.70.040–.060** (alterations, permits, destruction/restoration) (Chapter 17.70)
- Foster City Municipal Code — Chapter 17.76, Conversion Regulations (tenant protections and demolition constraints): **§ 17.76.040(B)(6)** (demolition permit restriction) (Chapter 17.76)
- Foster City Municipal Code — SB 9 / Two‑Unit Development chapter: **§ 17.79.040(A)(6)** (historic district / city landmark exclusion) and related SB 9 standards (**§ 17.79.020**, **§ 17.79.060**) (§ 17.79.040)
- Foster City Municipal Code — Chapter 17.96, Multifamily and Residential Mixed‑Use Objective Design and Development Standards: **§ 17.96.010–.030** (applicability and process) (Chapter 17.96)
- Foster City Municipal Code — ADU chapter: Chapter **17.78** (ADU standards and applicability)
- Foster City Municipal Code — Off‑street Parking: Chapter **17.62** (parking requirements affecting design)
- Foster City Municipal Code — Sign control, Chapter **17.59** (signage & review interface)
- FosterCity_ZoningCode.md
- 2025 California ADU handbook.md
Frequently asked questions
Do I always need architectural review to alter an older house in Foster City?
Usually yes for exterior changes that are visible and non‑exempt: Title 17 treats most new buildings, exterior modifications (windows, roofs, decks), and paved front yards as subject to architectural review per § 17.58.020; the review body must make the findings in § 17.58.050 before approval.
Can the city stop me from demolishing a residential building?
The code prevents issuance of a demolition permit for a residential building until a building permit for the replacement structure is approved and required tenant/affordability protections are addressed; see § 17.76.040(B)(6) — verify parcel‑specific exceptions for imminent hazards.
If my lot is in a Foster City historic district, can I use SB 9?
No — Foster City’s SB 9 chapter excludes parcels that are in a local historic district, designated as a city landmark, or listed on the State Historic Resources Inventory (see § 17.79.040(A)(6)). Verify designation with the city.
Which city rules determine whether a proposed addition “fits” the neighborhood?
Design compatibility is judged under the architectural chapter: the intent and criteria are in § 17.58.010, the specific triggers are in § 17.58.020, and approval findings are in § 17.58.050; project‑specific architectural guidelines adopted under § 17.58.060 may add requirements.
Are ADUs allowed on properties subject to historic preservation?
ADUs are allowed in Foster City’s residential zones (see Chapter 17.78), and local objective standards may be applied to prevent adverse impacts on historic resources — state ADU guidance also allows objective standards to protect listed historic resources. Confirm with the planning director.
Where are the city’s setback and dimensional standards I must meet during design review?
Setbacks and dimensional rules live in each district chapter and in the Development Standards chapter (for example, § 17.54.070 discusses setback averaging in R districts; area/bulk tables appear in chapters such as 17.22, 17.24, 17.26). Use those district sections together with Chapter 17.96 where objective design standards apply.
What happens to nonconforming historic buildings if they are damaged?
Nonconforming buildings destroyed more than a threshold of market value may only be restored consistent with current district regulations, except there are limited exceptions allowing restoration to original configuration for certain older residential dwellings built before 1972; see § 17.70.060. Confirm with the city for parcel‑specific outcomes.
Do sign or storefront changes trigger historic review?
Yes — sign and storefront changes visible from public areas can trigger architectural or sign review. Sign rules and processing are in Chapter 17.59, and the code ties sign permits to design review where required.
Who decides architectural review appeals?
Decisions by the planning director can be appealed to the planning commission and planning commission decisions can be appealed to the city council; appeal periods and procedures are in § 17.06.140–.150.
Can the city adopt special guidelines for a neighborhood to protect historic character?
Yes — the planning commission may adopt architectural guidelines (for specific developments or types of development) that can supersede other Title 17 provisions where they differ, under § 17.58.060.
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