Multifamily and Duplex Properties for Sale in Vallejo: Zoning and Rent Rules

What multifamily in Vallejo looks like

Vallejo has the deepest and oldest rental stock in Solano County. Investors find Victorian-era homes converted to two or more units near downtown, postwar duplexes and fourplexes in the flats, garden apartment complexes along the Sonoma Boulevard and Tennessee Street corridors, and newer rental buildings in the downtown and waterfront mixed-use areas. Mobile home parks are a separate investment class here because the city regulates their space rents. For financing, see financing 2-4 unit properties and apartment building loans.

One cost hits every Vallejo purchase: the city charges a real property conveyance tax of $1.65 per $500 under Chapter 3.10, plus a 27.5-cent-per-$500 transfer tax under Chapter 3.08, on top of the Solano County tax. Build it into acquisition costs.

Where the zoning allows it

Vallejo’s residential districts are in Chapter 16.202 of Title 16, the zoning code updated in 2025. Unlike many cities, Vallejo’s low-density district is not single-family only.

District	Housing types	Density	Lot and height
RR Rural Residential	Very low-density homes, agriculture, open space	Low	2.5-acre minimum (larger in -5, -10, -15 variants); 35 ft
RLD Residential Low Density	Single-unit homes, duplexes, townhouses, some cottages	Up to 9 units per net acre, excluding ADUs	5,000 sq ft lot; 35 ft
RMD Residential Medium Density	Attached and detached homes, small apartment buildings, some mixed use	Up to 25 units per net acre	5,000 sq ft lot; 1,740 sq ft per unit; 50 ft
RHD Residential High Density	Full mix including larger apartment buildings	Up to 40 units per acre, up to 50 with the Business/Limited Residential plan designation	5,000 sq ft lot; 1,100 sq ft per unit; 75 ft
NMX, DMX, WMX mixed use	Apartments over or beside commercial space	NMX 16 to 50; DMX and WMX up to 90 units per net acre depending on plan designation	DMX up to 8 stories; at least 15% of street-facing ground floor non-residential

The commercial CC and RC districts also allow housing at set densities, while Waterfront Commercial (WC) does not allow it at all (Chapter 16.204). Mixed-use and downtown projects must also provide 60 square feet of private and 150 square feet of common open space per unit. Title 16 has separate chapters on affordable housing incentives (16.214) and transit-oriented development (16.215) that may raise allowable density.

ADUs and SB 9. State ADU law lets most residential lots add an ADU and a JADU, and multifamily lots can add ADUs within existing non-living space and detached units. We did not review Vallejo’s local ADU standards for this page, so confirm them with the Planning Division. SB 9 lot splits and two-unit projects can apply in single-family zones of urbanized cities, but Vallejo’s RLD district already permits duplexes, so the zoning route may be simpler. See our guides to SB 9 and ADU investing.

Rent rules: state law, plus mobile home space rent control

For apartments and houses, Vallejo relies on state law. The Attorney General’s rent cap page lists no Vallejo rent cap and places Solano County under All Other Counties, where the maximum increase is 7.7% for increases starting August 1, 2025 through July 31, 2026, and 8.6% from August 1, 2026 through July 31, 2027. The AG notes its chart is not a complete list of local laws. Covered units generally include housing more than 15 years old, and just cause rules apply after the qualifying tenancy period. Vallejo used a temporary emergency rent cap in 2019, and tenant groups have since pressed for permanent protections; we found no general rent ordinance in the current municipal code, but check with the city before you buy. See our guides to AB 1482 and just cause eviction.

Vallejo rental property rules

Mobile home parks. Chapter 5.64, adopted in its current form by Ordinance 1798 on June 12, 2018, regulates space rents in any park with two or more spaces:

One cost-of-living increase per 12 months without a hearing, capped at the average change in two consumer price indexes and rounded to the nearest quarter percent. An owner out of compliance with the chapter or city health and building codes loses that exemption.
Capital improvements need prior written consent from a majority of occupied spaces and are amortized over at least 60 months. Capital replacements must cost at least $5,000 to pass through.
Vacancy control: after a sale or transfer of a home, the new space rent cannot exceed 50% of HUD’s two-bedroom Fair Market Rent for Solano County.
Fair-return petitions use 2016 as the base year and carry a $2,500 hearing fee. Appeals go to the City Council.
New tenancies over 12 months may be exempt under Civil Code Section 798.17.

Shoreline sites. New buildings next to Mare Island Strait, the Napa River or the Carquinez Strait must provide public shoreline access, which affects site planning for waterfront apartments.

Older buildings, seismic and inspection issues

Much of Vallejo’s housing predates modern codes, especially near downtown. Wood-frame buildings with tuck-under parking deserve a seismic retrofit review; we did not find a mandatory city soft-story program in the code chapters reviewed. Buildings with three or more units and wood balconies or stairs need SB 721 inspections. Ask for permit history on converted Victorians, since unpermitted units can affect both rent and financing.

Underwriting a Vallejo multifamily purchase

Confirm the district under the 2025 zoning code and check for a specific plan (Downtown Vallejo, Mare Island, Sonoma Boulevard and others).
Count units against the lot: 1,740 square feet per unit in RMD and 1,100 in RHD.
Model increases at the AB 1482 cap for covered units, and verify with the city that no new local ordinance applies.
For a mobile home park, model space rents under Chapter 5.64’s CPI formula and vacancy limit.
Add the city conveyance tax and transfer tax to closing costs and agree who pays.
Collect leases, the rent roll, two years of statements and estoppel certificates, then run our rental property analysis.

Questions people ask

Does Vallejo have rent control on apartments?

Not on the AG’s chart. Apartments follow the state cap, 8.6% for covered units from August 1, 2026. Mobile home park spaces are under city rent control.

Can I build a duplex in Vallejo’s low-density zone?

Yes. The RLD district allows duplexes and townhouses as well as single homes, at up to nine units per net acre.

How dense can an apartment project be?

Up to 25 units per acre in RMD, 40 in RHD (50 with the right plan designation) and up to 90 in the downtown and waterfront mixed-use districts.

How much is the transfer tax on a Vallejo sale?

As we read the codes, the city charges $1.65 plus $0.275 per $500, and the county’s $0.55 is reduced by the half-rate city tax. Confirm on your escrow estimate.

What does Vallejo’s mobile home rent law limit?

Annual increases are tied to CPI, capital pass-throughs need resident consent, and new-tenant rent after a home sale is capped at half of HUD’s two-bedroom Fair Market Rent.

Can a waterfront commercial property be converted to apartments?

Not in the WC district, which bars housing. A rezoning or a WMX site would be needed.

Do older Vallejo buildings need retrofits?

Not under a city mandate we found, but soft-story wood frames merit a review, and SB 721 balcony inspections apply to three or more units.

Sources & notes

Note: The 2019 emergency rent cap and later advocacy are from news coverage, not an official source; we found no current general rent ordinance in the code.

General information, not legal or tax advice. Last reviewed October 2026 by Matthew Martinez.

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