Duarte — Overlay Districts

Last reviewed: July 2, 2026

Overview

Overlay districts in Duarte are supplemental zoning layers that modify the rules of an underlying base zone for targeted policy goals. The Development Code defines an Overlay zone as a tool to apply special use or development regulations; the primary named overlay in the Code is the Affordable Housing Overlay (AHO), which creates site-specific incentives (density, process, and standards) to implement the Housing Element. For how overlays interact with the rest of the Code see § 19.06.010 and for the AHO rules see Chapter 19.26 (§ 19.26.010 et seq.) .

Note: this page covers only overlay rules that appear in the Duarte Development Code. Verify parcel-specific mapping with the City (zoning map) before acting.

How Duarte defines an Overlay

• An Overlay zone “supplements the base zone” and, where conflict exists, overlay provisions control over the base zone (§ 19.06.010.C) .
• Overlays may be applied singly or combined with state incentives (for example, the AHO can be combined with State Density Bonus rules) (§ 19.26.010) .

Relevant city pages (first appearance only): Duarte’s general zoning map and base-district rules are available under Duarte Zoning and development standards at Duarte Development Standards. Mentions of site-level obligations such as parking and design review are linked below in context: parking, design review, ADUs, and the state building-code.

• Duarte Zoning: Duarte Zoning
• Duarte Development Standards: Duarte Development Standards

District-by-district: Named Overlay(s) in the Code

Note: the Development Code provides a general overlay mechanism (§ 19.06.010.C) and, in the materials retrieved, the only explicitly named overlay chapter is the Affordable Housing Overlay (AHO) (Chapter 19.26) . If you are looking for other overlays (historical, floodplain, scenic, etc.), they are Not found in retrieved materials — Verify with the jurisdiction.

Affordable Housing Overlay — AHO (Chapter 19.26)

• Purpose: The AHO is established to implement the Housing Element by encouraging affordable housing on identified opportunity sites through increased density and other incentives. The AHO can be used alone or alongside State Density Bonus law (§ 19.26.010) .
• Where it applies: Designated “Opportunity Sites” listed in § 19.26.030 (for example, 1214 Elmhurst & 2150-2200 Huntington; 2400-2422 Huntington; 1806-1812 Mountain Ave + adjacent parcels; and 1900 Buena Vista) — see § 19.26.030 for the full list and map reference .
• Typical permitted uses / permitting path:
  • Housing developments that meet the AHO affordability requirements are a permitted use in the AHO and may be processed ministerially under the AHO standards; projects may alternatively use the Planned Development Permit route but are exempt from the minimum site area in § 19.118.020.B when using the AHO (§ 19.26.070) .
• Key dimensional and program standards (summary — always confirm the text in § 19.26.050):
  • Density: base overlay density up to 30 units/acre, minimum 20 units/acre; 100% lower-income projects may receive an automatic 80% density increase (up to 54 units/acre) via State Density Bonus eligibility (§ 19.26.050.1) .
  • Height: maximum 50 feet / 4 stories; buildings taller than three stories that front streets must include height modulation and any stories above the third must have an average 12 ft setback from the front property line (§ 19.26.050.2) .
  • Setbacks: Front 10 ft; Side 5 ft; Rear 10 ft (minimums) (§ 19.26.050.3) .
  • Open space: minimum 125 sq ft per residential unit (usable — can be combination of private/common/quasi-public) (§ 19.26.050.4) .
  • Parking: underlying zone parking requirements apply unless modified; per-affordable-unit parking: studio/1‑bed = 1 space; 2–3 bed = 1.5 spaces; 4‑bed = 2.5 spaces; senior projects may qualify for lower ratio (0.5 per unit) (§ 19.26.050.5) — consult the City’s parking chapter for design and calculation details . Link to city parking page: Duarte Parking
  • Affordability & longer-term obligations: The required affordable unit mix and affordability durations are specified in § 19.26.040; the applicant must execute an agreement ensuring affordability for at least 55 years prior to issuance of any building permit (§ 19.26.040.3) .
  • Lot consolidation incentive: For some Opportunity Sites, assembling a minimum 40,000 sq ft parcel can increase allowable density up to 40 units/acre (see § 19.26.060) .
  • Conflict rule: AHO standards are additive; where a conflict exists between AHO standards and other Development Code provisions, the AHO provisions govern (see § 19.26.050.6) .
• Process notes: Projects that meet the AHO affordability tests are processed ministerially under the AHO (subject to objective development standards and Chapter 19.32 site planning rules) or may choose the Planned Development Permit route; the AHO waives the minimum site area in § 19.118.020.B for the planned development option (§ 19.26.070) .

Most decision-relevant standards (quick reference table)

Checklist (applicant-perspective)

• Confirm the property is designated within the AHO Opportunity Sites on the official zoning map (verify with City) (§ 19.26.030) .
• Confirm the project meets the AHO affordability mix and record an affordability agreement for ≥55 years prior to any building permit (§ 19.26.040.3) .
• Prepare a site plan that meets AHO development standards: density (≥20 / ≤30 u/ac unless State Density Bonus increases), height ≤50 ft (4 stories), setbacks F10/S5/R10 ft, open space 125 sq ft/unit (§ 19.26.050) .
• Produce a parking plan in compliance with the underlying zone requirements and AHO ratios (round up fractional spaces) and include any requested reductions/justification; consult the City’s Duarte Parking rules for layout and design (§ 19.26.050.5) .
• If seeking density bonuses or incentives, file a density-bonus application per Chapter 19.64 and prepare the density bonus agreement for City approval and recordation (§ 19.64.020) .
• Confirm review path (ministerial vs. Site Plan & Design Review) and submit materials according to the applicable review route (see Site Plan & Design Review rules in Chapter 19.122; design review thresholds and authorities in § 19.122.030) .
• Execute any required lot-assembly incentive documentation if pursuing the 40,000 sq ft consolidation incentive (§ 19.26.060) .
• Record any required covenants/agreements and ensure compliance with objective standards in Chapter 19.32 (site planning & general development standards) (§ 19.32.010) .

If your application involves architectural changes, expect to interact with the City’s Duarte Design Review process and with City standards in Duarte Development Standards for setbacks, landscaping and screening; see the relevant chapters cited above.

Risks & Ambiguities

Plain-English Summary

Duarte’s Development Code gives the City an Overlay tool; the only named overlay in the retrieved materials is the Affordable Housing Overlay (AHO). If your parcel is inside an AHO Opportunity Site, you can build affordable housing under streamlined/ministerial rules with higher densities (and defined height, setback, open-space, and parking standards), provided you sign and record long-term affordability agreements and meet the objective AHO standards (§ 19.26.010–.070) .

Source References

• Code definition of Overlay zone: § 19.06.010 (Base zone / Overlay zone language)
• Affordable Housing Overlay (AHO) — Purpose and definitions: § 19.26.010, § 19.26.020
• AHO Applicability / Opportunity Sites: § 19.26.030
• AHO Affordability requirements and agreement timing: § 19.26.040 (includes 55‑year affordability requirement)
• AHO Development standards (density, height, setbacks, open space, parking, conflict rule): § 19.26.050 (subparts)
• AHO Lot consolidation incentives: § 19.26.060
• AHO Process (ministerial vs planned development option): § 19.26.070
• Density bonus procedures (Chapter 19.64): § 19.64.010–.030, especially § 19.64.020 for density bonus rules and the City’s implementation of State law
• Site planning and general development standards applicable across zones (Chapter 19.32): § 19.32.010
• Site Plan & Design Review thresholds and review authority (Chapter 19.122): § 19.122.030 (review authority)

Useful city-topic pages (first in-text mention linked):

• Duarte Zoning — to check base zone designations and the official zoning map.
• Duarte Development Standards — for site, setback, and lot-coverage rules that still apply with overlays.
• Duarte Parking — parking chapter to confirm layout and counting rules referenced by the AHO.
• Duarte Design Review — design and site plan review pathways that may apply if the project is not fully ministerial.
• Duarte ADUs — ADU rules are in a separate chapter; ADU-specific exemptions/limits are Not found in retrieved overlay materials and must be checked separately.
• California Building Standards Code — building code (Title 24) obligations are separate from zoning and must be met at permit stage (code text not repeated here).

Retrieved passages

• Duarte Zoning Code (§ 4) Medium relevance show source text
• Duarte Zoning Code (Chapter 19.26) Medium relevance show source text
• Duarte Zoning Code (§ 3) Medium relevance show source text
• Duarte Zoning Code (§ 4) Medium relevance show source text
• Duarte Zoning Code (ARTICLE 1) Medium relevance show source text
• Duarte Zoning Code (Section 19.142.060) Medium relevance show source text
• Duarte Zoning Code (Chapter 19.06) Medium relevance show source text
• Duarte Zoning Code (ARTICLE 1) Medium relevance show source text
• Duarte Zoning Code (§ 4) High relevance show source text
• Duarte Zoning Code (Section 65915) High relevance show source text
• Duarte Zoning Code (§ 4) High relevance show source text
• Duarte Zoning Code (§ 6) Medium relevance show source text
• Duarte Zoning Code (Chapter shall) Medium relevance show source text

Cited sections

• Code definition of Overlay zone: § **19.06.010** (Base zone / Overlay zone language)
• Affordable Housing Overlay (AHO) — Purpose and definitions: § **19.26.010**, § **19.26.020**
• AHO Applicability / Opportunity Sites: § **19.26.030**
• AHO Affordability requirements and agreement timing: § **19.26.040** (includes 55‑year affordability requirement)
• AHO Development standards (density, height, setbacks, open space, parking, conflict rule): § **19.26.050** (subparts)
• AHO Lot consolidation incentives: § **19.26.060**
• AHO Process (ministerial vs planned development option): § **19.26.070**
• Density bonus procedures (Chapter 19.64): § **19.64.010–.030**, especially § **19.64.020** for density bonus rules and the City’s implementation of State law (Chapter 19.64)
• Site planning and general development standards applicable across zones (Chapter 19.32): § **19.32.010** (Chapter 19.32)
• Site Plan & Design Review thresholds and review authority (Chapter 19.122): § **19.122.030** (review authority) (Chapter 19.122)
• Duarte Zoning — to check base zone designations and the official zoning map.
• Duarte Development Standards — for site, setback, and lot-coverage rules that still apply with overlays.
• Duarte Parking — parking chapter to confirm layout and counting rules referenced by the AHO. (chapter to)
• Duarte Design Review — design and site plan review pathways that may apply if the project is not fully ministerial.
• Duarte ADUs — ADU rules are in a separate chapter; ADU-specific exemptions/limits are Not found in retrieved overlay materials and must be checked separately.
• California Building Standards Code — building code (Title 24) obligations are separate from zoning and must be met at permit stage (code text not repeated here). (Title 24)
• Duarte_ZoningCode.md

• Official Duarte code library