Union City Zoning Intelligence
Zoning, permitted uses, ADU rules, and development potential for Union City, California. 30 districts analyzed.
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How is Union City zoned?
Permitted uses vary by district. Search a Union City parcel on the map above to see exactly what you can build there.
- Total zoning districts30
- Residential districts5
- Commercial districts8
- Industrial districts3
Statewide law - applies to all California cities, not specific to Union City.
- California state ADU lawApplies statewide
- SB-9 lot split eligibilityPer parcel review
- SB-79 (transit-oriented housing)Near transit, from Jul 2026
- Density Bonus Law (state)Eligible projects
- Local impact / permittingVerify with Union City planning
What should developers know about Union City zoning?
Union City is an East Bay city in Alameda County that sits at the intersection of two major growth vectors: a BART station with transit-oriented development overlay zones and a substantial light industrial base along the southern bay margin. Its 30 districts reflect this dual character. The Agricultural (A) zone at 4,390 acres is technically the largest designation, but this primarily reflects open space and bay-edge land rather than active farming - much of it is not realistically developable under current land use policy. The substantive developable residential land is anchored by RS-6000 Single Family Residential at 1,316 acres and Open Space (OS) at 1,847 acres.
The transit-oriented picture is particularly notable: the Station Mixed Use Commercial (CSMU, 78 acres), Station East Employment (SEE, 54 acres), and Station East Mixed Use Residential (SEMU-R, 34 acres) districts cluster around the Union City BART station and represent the city's primary TOD (transit-oriented development) opportunity zone. Industrial land is concentrated in Light Industrial (ML, 681 acres) and Special Industrial (MS, 180 acres), with General Industrial (MG, 69 acres) handling heavier uses. Building controls span FAR, lot, density, coverage, pervious, lot width, setbacks, and height.
Multifamily residential capacity sits primarily in the RM-1500 (78 acres), RM-2500 (314 acres), and RM-3500 (26 acres) districts, with a small RM-1500-HE Housing Element Overlay adding targeted capacity. Village Mixed Use (VMU, 20 acres) and Corridor Mixed Use (CMU, 7 acres) add mixed-use options. The Marketplace Mixed Use (MMU, 35 acres) near Union Landing and the Union Landing Commercial (CUL, 97 acres) define the city's major retail hub. This is pre-development intelligence, not legal advice - verify with the local planning department before acquisition.
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Try ArchiWise free →Union City, California Zoning Districts: What Do They Mean?
Zoning districts are areas regulated by specific laws that determine land use, building types, and development rules. Each district below shows its zone type and which uses it permits.
| Zone Code | Zone Type | Permitted Uses | Area |
|---|---|---|---|
A Agricultural | - | - | 4,390.7 ac |
CC Community Commercial | - | - | 35 ac |
CF Civic Facility | - | - | 250.2 ac |
CMU Corridor Mixed Use | - | - | 6.9 ac |
What are the building controls in Union City?
Setback, height, FAR, lot area, and density controls enforced across Union City zoning districts.
- Assorted
- Far control
- Lot control
- Multi control
- Density control
- Coverage control
- Pervious control
- Lot width control
- Rear setback control
- Side setback control
- Front setback control
- Building height control
Cities near Union City
Union City zoning: frequently asked questions
What transit-oriented development opportunities exist near Union City BART?
Three distinct transit-area zones surround the Union City BART station: Station Mixed Use Commercial (CSMU, 78 acres), Station East Employment (SEE, 54 acres), and Station East Mixed Use Residential (SEMU-R, 34 acres). These districts are intended to accommodate higher-density residential, mixed-use, and employment uses within walking distance of the station. Projects in CSMU and SEMU-R are among the most viable multifamily development targets given regional infill pressure and state TOD housing mandates.
What does the large Agricultural (A) zone mean in the context of Union City?
The A district at 4,390 acres in Union City predominantly covers bay-edge marshlands, flood-prone areas, and open space land rather than commercially viable farmland. Most of this land is subject to conservation easements, wetland regulations, and Bay Conservation and Development Commission jurisdiction. It is generally not a realistic development target and should be understood as an ecological and open space reserve.
Which Union City zones support light industrial, warehousing, or logistics uses?
Light Industrial (ML) at 681 acres is the primary industrial zone, accommodating warehousing, manufacturing, and distribution uses. Special Industrial (MS) at 180 acres handles more restricted or heavy industrial activities, and General Industrial (MG) at 69 acres serves general manufacturing. Together these three industrial districts total roughly 930 acres, making Union City a meaningful industrial market node in the southern Alameda County industrial corridor.
Where is Union City's major retail concentration located?
Union Landing Commercial (CUL, 97 acres) and Marketplace Mixed Use (MMU, 35 acres) anchor the main retail hub in the northern part of the city along the freeway corridor. Community Commercial (CC, 35 acres) and Neighborhood Commercial (CN, 8 acres) serve smaller neighborhood-scale retail nodes. Professional and Administrative Commercial (CPA, 35 acres) handles office-oriented uses separately from the retail commercial districts.
How does the Housing Element Overlay (RM-1500-HE) affect multifamily development in Union City?
The RM-1500-HE designation at 5 acres is a Housing Element overlay applied to specific sites identified by the city to meet its state-mandated Regional Housing Needs Allocation (RHNA). This overlay signals that the city has committed these sites for higher-density residential development to satisfy state housing law requirements. Developers targeting these parcels benefit from a streamlined political and regulatory posture compared to re-zoning requests elsewhere in the city.
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Zoning data is pre-development intelligence, not legal advice. Verify with the Union City planning department before acquisition or design.