Local zoning · Downey

Downey — Nonconforming Uses

Q: What happens to a lawful nonconforming use if it is unused for six months?

If a lawful nonconforming use is discontinued for 180 days or more , it cannot be reestablished; the City Planner may extend this period if the owner proves diligent pursuit or a building permit exists — see § 9410.06(c)–(d) .

Q: If my nonconforming commercial building is 60% damaged in a fire, can I rebuild it as it was?

Not necessarily. For nonresidential buildings, if damage exceeds ½ of the assessed valuation the structure shall not be reconstructed except in conformity with current code; residential buildings have a different rule allowing reconstruction to prior condition if reconstruction is started within 24 months — see § 9410.10(b)(1)–(2) .

Q: Who decides exceptions to amortization or extensions of the 180‑day rule?

The City Planner can grant extensions of the 180‑day reinstatement period based on substantial evidence of diligence; appeals of the City Planner’s decision may go to the Commission (see § 9410.06(d) and the exception procedure in § 9410.08(d) ) .

Nonconforming Uses under the Downey local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

This page explains how the City of Downey treats nonconforming uses, buildings, structures, and lots under the local zoning rules in Title 9 (land use) of the Downey Municipal Code. It summarizes the municipal rules that control continuation, repair, enlargement, abandonment, and amortization of nonconforming conditions and shows how those rules interact with the city's zone development standards. For quick reference on the city's overall zoning map and districts see Downey zoning & planning overview and the specific Downey Zoning menu entry.

Key Downtown rules that control nonconforming conditions (plain-English, code anchors)

The nonconforming rules apply to all existing, lawful nonconforming uses, buildings, and structures and to anything made nonconforming by code change; illegal (unpermitted) conditions are not protected and must be abated (§ 9410.04) .
A lawful nonconforming use may continue so long as it is not relocated, enlarged, or altered to increase the discrepancy from current standards, except where a narrow addition rule applies (§ 9410.06, § 9410.12) .
If a legal nonconforming use is discontinued for 180 days or more, it cannot be reestablished unless the City Planner extends that period based on evidence of diligent pursuit (§ 9410.06(c)–(d)) .
A legal nonconforming use may not increase in intensity or expand activities (§ 9410.06(e)) .
The code sets repair, reconstruction, and amortization rules: ordinary repairs are allowed but structural or value-based rebuilds are limited; demolition/major reconstruction can trigger loss of nonconforming status (§ 9410.10, § 9410.12, § 9410.08) .
For many zones, the code expressly ties nonconforming treatment to the zone development rules — check the zone's development standard tables (they repeat: “Nonconforming uses, lots, and structures — Subject to Section 9410”) — for example R‑1, R‑2, R‑3, MU, P, O‑S, and HOU‑1/HOU‑2 (see the zone tables) .

District-by-district breakdown (purpose, typical uses, key dimensional standards, where it applies)

Below each district summary I note the explicit relay back to the nonconforming rules (Section 9410) that apply in that district.

R‑1 (Single‑Family Residential)

Purpose: preserve single‑family neighborhoods and set objective residential design standards. Typical permitted uses are single‑family dwellings and customary accessory structures (see Table 9.3.3). Development standards vary by R‑1 subcategory (e.g., R‑1‑5,000, R‑1‑6,000, etc.). Key measures include minimum lot area (by subzone), yard setbacks, and building height limits; the R‑1 tables cite nonconforming rules as applicable (§ 9410) .
Where it applies: standard single‑family neighborhoods across Downey (see Table 9.3.3) .
Nonconforming notes: If a single‑family dwelling in the C‑P zone existed as of Oct. 28, 2008 and remains residential, the code preserves that status (not treated as a nonconforming building for some amortization rules) (§ 9410.08) .

R‑2 / R‑3 / R‑3‑O (Two‑ and Multi‑Family Residential)

Purpose & uses: duplex and small multiunit housing per Table 9.3.4. Standards include lot coverage, unit size minimums, and building separations (Table 9.3.4 notes nonconforming rules apply) (§ 9410) .
Nonconforming notes: same code-wide limits apply (no change of use to a different non‑permitted use, 180‑day abandonment rule, no intensity increases) (§ 9410.06) .

MU (Mixed‑Use)

Purpose & uses: higher‑density mixed commercial/residential development; Table 9.3.8 sets FAR (e.g., FAR 4.0), height limits (75 ft or 5 stories), and other standards; nonconforming entries are explicitly subject to Section 9410 .
Nonconforming notes: additions must conform unless the limited expansion rules apply; parking/nonconforming parking is treated specially in § 9410.12(b) for certain residential expansions (§ 9410) .

P (Public Zone)

Purpose & uses: public buildings, schools, parks and utilities; Table 9.3.12 indicates most dimensional standards and expressly references nonconforming treatment under § 9410 .

O‑S (Open Space)

Purpose & uses: parks, passive open space; Table 9.3.14 lists yards and height limits and points to nonconforming rules (Section 9410) for legacy conditions .

HOU‑1 / HOU‑2 (Housing Overlay Zones)

Purpose & uses: overlay zones created for targeted housing development and density incentives; Table 9.3.16 lists lot area, density, setbacks, and includes the line “Nonconforming uses, lots, and structures — Subject to Section 9410” — so overlay developments follow the base nonconforming rules (§ 9410) .
Where it applies: only on properties designated in the Housing Element or as identified by the overlay maps.

Commercial Zones (C‑2, C‑3, etc.) and special mentions

Typical commercial uses are governed by the Table 9.3.x use tables. Motels are permitted in C‑2 and C‑3 only with a Conditional Use Permit and that section cross‑references usual nonconforming rules where applicable (§ 9412.04 and § 9410) .

For any district above the detailed development standards and setbacks are in each zone table; the development tables repeatedly note “Nonconforming uses, lots, and structures — Subject to Section 9410,” so check the table for the district you’re working in and then check § 9410 for nonconforming treatment (examples: Table 9.3.3, Table 9.3.4, Table 9.3.8, Table 9.3.12, Table 9.3.14, Table 9.3.16) .

Quick reference table — most decision‑relevant nonconforming rules

Rule / Decision point	What the code requires	Code Reference
Continuing an existing use	Lawful existing use may continue but cannot be relocated, enlarged, or altered to increase nonconformity; cannot change to another non‑permitted use (§ 9410.06)	§ 9410.06
Abandonment / reinstatement	If discontinued ≥ 180 days it cannot be reestablished (City Planner may extend)	§ 9410.06(c)–(d)
Repairs / maintenance	Ordinary repairs allowed; structural alterations limited; repair/replacement up to 10% of replacement cost in any 24‑month period; cubic content not increased	§ 9410.10(a)
Reconstruction after damage	Nonresidential: if damage > ½ assessed valuation cannot be reconstructed except conforming. Residential: may be rebuilt to prior condition if work starts within 24 months	§ 9410.10(b)
Additions / enlargement	Generally prohibited to enlarge beyond existing occupied area; exceptions: additions must conform; limited expansion allowed for R‑1/R‑2 where nonconforming only by parking — up to 50% of existing floor area (with City Planner finding)	§ 9410.12(b)
Amortization / termination	The code lists specific amortization periods tied to building type (e.g., 10, 15, 20 years after Oct 28, 2008); Council may shorten if determined a nuisance	§ 9410.08(b)–(b)(6)
Definition (what “nonconforming” means)	Nonconforming Building/Structure/Use defined in § 9148 — lawfully established but no longer conforming to current regs	§ 9148

Practical guidance and intersections

Before contemplating repairs, expansions, or a change of use, check the specific zone table for the property (for setbacks, lot area, FAR, height) and then apply the § 9410 rules; the zone tables routinely point you to § 9410 for nonconforming conditions (see Table 9.3.x for most zones) .
When you see a nonconforming parking condition, note the special allowance for limited enlargement in R‑1/R‑2 where the only nonconformity is insufficient enclosed off‑street parking (limited to 50% floor area increase subject to City Planner demonstration) — this is a narrow, parking‑specific exception (§ 9410.12(b)) . For broader questions about parking rules see Downey Parking.
Design changes that affect zoning compliance (setbacks, lot coverage, height) will generally push a structure to conform; consult the city's development standards and the applicable table (Downey Development Standards) and the objective design checklist — where design review is required see Downey Design Review.
ADU projects: state ADU rules affect how nonconforming zoning conditions are treated; Downey’s nonconforming rules exist but state ADU law has prohibitions on denying ADUs solely because of certain nonconforming zoning conditions — see Downey ADUs and the California Building Standards Code for construction rules. For interplay between nonconforming zoning conditions and ADU approvals: verify with the City as the code text here does not expressly restate state ADU exceptions (see § 9410 generally) .

Checklist (what an applicant/owner must satisfy / check)

Identify whether the condition was lawfully established (compare dates and permits) — definition in § 9148 .
Confirm whether the use/structure was discontinued ≥ 180 days (if yes, nonconforming rights lost) — § 9410.06(c) .
For proposed repairs, calculate whether ordinary repairs exceed 10% of replacement cost within 24 months (if more, repair may be limited) — § 9410.10(a)(2) .
If the building was damaged, confirm assessed valuation loss and whether rebuild can restore the nonconforming condition (residential 24‑month start rule applies) — § 9410.10(b) .
For proposed enlargement, verify whether the addition is allowed (most enlargements prohibited; narrow exceptions for parking‑only nonconformances in R‑1/R‑2) — § 9410.12(b) .
For potential amortization/termination, check whether the property was the subject of City notice and applicable amortization date (historic amortization dates tied to Oct. 28, 2008 are in the code) — § 9410.08 .
If seeking an exception to termination or an extension of the 180‑day rule, prepare evidence showing diligent pursuit / building permit activity and submit application to the City Planner (appeals go to the Commission) — § 9410.08(d) and § 9410.06(d) .
Cross‑check required parking and whether any parking‑related nonconforming condition triggers the R‑1/R‑2 limited expansion rule — see § 9410.12(b) and the zone parking chapters in Downey Parking .

Risks & Ambiguities

Issue	Why it matters	What to verify
Amortization deadlines (historic dates)	The code contains specific amortization periods measured from Oct. 28, 2008 (10/15/20 years depending on building type). These create hard deadlines for termination in some circumstances	Verify whether the property was subject to a City notice and which amortization period applies; see § 9410.08
Damage threshold / assessed valuation cut‑off	If nonresidential damage exceeds ½ of assessed value reconstruction is barred unless conforming — ambiguous how “assessed valuation” is calculated for older properties	Confirm the assessor’s valuation methodology and obtain written City interpretation before undertaking rebuild; see § 9410.10(b)(1)
“Diligent pursuit” for 180‑day extension	The City Planner may extend the 180‑day abandonment window if the owner shows diligence — but what constitutes sufficient evidence is discretionary	Prepare building permits, contracts, financing docs, communications with tenants; appeal rights exist to the Commission (see § 9410.06(d))
Parking‑only expansion exceptions	The 50% expansion allowance for R‑1/R‑2 if nonconforming only due to parking is narrow; other code conflicts (setbacks, lot coverage) may still bar expansion	Demonstrate that the only nonconformity is enclosed off‑street parking and that expansion won’t prevent future compliance; cite § 9410.12(b)
Overlap with state ADU law	State ADU law may limit a local agency’s ability to deny ADUs due to some nonconforming zoning conditions — the municipal code does not duplicate those state exemptions	Verify ADU permit decision logic with the Planning Department and consult Downey ADUs and state ADU rules; local code references § 9410 but state law can override in specific ADU contexts (not restated here)
Whether a condition is “lawful”	Only lawful preexisting conditions get nonconforming protection; many older changes may lack formal permits	Obtain historical permit records or use a legal nonconforming determination application through the City Planner; see definition § 9148 and § 9410.04

Plain‑English Summary

If a building or use in Downey was lawful when it started but no longer meets today’s zoning rules, it may remain but only under strict limits: you generally cannot change it to another non‑permitted use, increase its intensity, or rebuild/expand in ways that increase the nonconformity; if it’s unused for 180 days you lose the right to resume it, and larger repairs or rebuilds can force you to comply with current standards — see the code’s nonconforming rules at § 9410 for full details .

Source References

Downey Municipal Code — § 9410 Nonconforming Uses, Buildings, and Structures (intent, general provisions, continuation, amortization, repair, additions, violations): § 9410.02, § 9410.04, § 9410.06, § 9410.08, § 9410.10, § 9410.12, § 9410.14 .
Downey Municipal Code — § 9148 Definitions (Nonconforming Building/Structure/Use) .
Downey Municipal Code — Zone development standard tables referencing nonconforming treatment (e.g., Table 9.3.3 R‑1; Table 9.3.4 R‑2/R‑3; Table 9.3.8 MU; Table 9.3.12 P; Table 9.3.14 O‑S; Table 9.3.16 HOU‑1/HOU‑2) — these tables include the line “Nonconforming uses, lots, and structures — Subject to Section 9410” .
Downey Municipal Code — § 9412 (Motels — note C‑2/C‑3 CUP references) .

Sources

Retrieved passages

Downey Zoning Code (§ 9410.08.) High relevance
Downey Zoning Code (article and) High relevance
Downey Zoning Code (section also) High relevance
Downey Zoning Code (§ 9410.10.) High relevance
Downey Zoning Code (§ 9408.10.) High relevance
Downey Zoning Code (section shall) High relevance
Downey Zoning Code (§ 9148.) High relevance
Downey Zoning Code Medium relevance

Cited sections

Official Downey code library

Frequently asked questions

What happens to a lawful nonconforming use if it is unused for six months?

If a lawful nonconforming use is discontinued for 180 days or more, it cannot be reestablished; the City Planner may extend this period if the owner proves diligent pursuit or a building permit exists — see § 9410.06(c)–(d) .

Can I enlarge a nonconforming single‑family house in Downey?

Generally no — a legal nonconforming building shall not be enlarged in a way that increases the nonconformity; a narrow exception allows R‑1 or R‑2 dwellings that are nonconforming only because of insufficient enclosed off‑street parking to expand up to 50% of the existing floor area if the City Planner finds the expansion will not prevent future required parking — see § 9410.12(b) .

Are ordinary repairs allowed on a nonconforming structure?

Yes. Ordinary repairs and replacement of nonbearing elements are permitted, but structural alterations are not allowed except as required by law or to make the structure conform; repairs/replacements cannot exceed 10% of current replacement cost in any 24‑month period and the cubic content cannot be increased — see § 9410.10(a) .

If my nonconforming commercial building is 60% damaged in a fire, can I rebuild it as it was?

Not necessarily. For nonresidential buildings, if damage exceeds ½ of the assessed valuation the structure shall not be reconstructed except in conformity with current code; residential buildings have a different rule allowing reconstruction to prior condition if reconstruction is started within 24 months — see § 9410.10(b)(1)–(2) .

Can a nonconforming use change to another use that is allowed in the district?

Yes — a legal nonconforming use may be changed, but only to a use that is permitted in the zoning district in which it is located; it cannot be changed to another nonconforming or non‑permitted use (§ 9410.06(b)) .

Do the zone tables in Downey list nonconforming rules for every district?

Yes. Most zone property development standard tables include an explicit line stating “Nonconforming uses, lots, and structures — Subject to Section 9410,” so you must read the zone’s development table (setbacks, FAR, height) and then apply § 9410 to legacy conditions (examples: R‑1, MU, P, O‑S, HOU‑1/HOU‑2) .

If my property was made nonconforming by a zoning map change, can the Council require immediate termination?

The Council may order termination within a period shorter than the standard amortization periods if it finds the use constitutes a nuisance or danger to public health, safety, or welfare — the code lists this authority in § 9410.08(b)(6) and contains the amortization framework with specific periods measured from Oct. 28, 2008 for different building types .

Is a garage converted to an ADU treated as a nonconforming structure that can block an ADU permit?

State ADU law limits a local agency’s ability to deny an ADU solely because of certain nonconforming zoning conditions. Downey’s § 9410 controls nonconforming conditions generally, but ADU approvals may be governed by state ADU provisions as well — verify with the Planning Department and consult Downey ADUs and state law; the municipal code’s nonconforming rules are in § 9410 (the code does not restate the state ADU exemptions) .

Who decides exceptions to amortization or extensions of the 180‑day rule?

The City Planner can grant extensions of the 180‑day reinstatement period based on substantial evidence of diligence; appeals of the City Planner’s decision may go to the Commission (see § 9410.06(d) and the exception procedure in § 9410.08(d)) .

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