Investment Property in Santa Rosa: Rents, Rules and Strategies
Santa Rosa investment property runs on state rental law rather than a city rent ordinance, as far as we found in October 2026: voters rejected the city’s rent and eviction ordinance in 2017, so apartments and houses here follow California’s rent cap and just-cause rules where they apply. The local rules that do change the numbers are a $2.00-per-$1,000 city transfer tax on top of the county’s, a closed cap on whole-home vacation rentals, a source-of-income ordinance, and zoning that puts most multifamily potential in the R-2, R-3 and mixed-use districts.
Santa Rosa is the county seat and Sonoma County’s largest city, with an estimated 179,437 residents on July 1, 2025, and the Census Bureau’s 2020–2024 survey put the owner-occupied share of homes at 56.7%. This page is for investors buying duplexes, small apartment buildings, houses to rent, or mixed-use property inside city limits. For the city itself, start with our Santa Rosa guide.
Santa Rosa rental market basics
The Census Bureau’s QuickFacts for Santa Rosa, drawn from the 2020–2024 American Community Survey, gives a starting frame:
| Measure | Santa Rosa | Period |
|---|---|---|
| Population estimate | 179,437 | July 1, 2025 |
| Owner-occupied housing unit rate | 56.7% | 2020–2024 |
| Median value, owner-occupied homes | $713,900 | 2020–2024 |
| Median gross rent | $2,152 a month | 2020–2024 |
These are five-year survey figures, so they trail current asking rents and sale prices. Underwrite from signed leases on comparable units near the property, and treat the census median as a check on whether a pro forma’s rent is plausible. Our rental property analysis guide walks through the full underwriting.
Rent and eviction rules
The City Council passed a rent and eviction ordinance in August 2016, but a referendum put it to voters, and Measure C, which would have kept it, was rejected by 52.5% in the June 6, 2017 special election, as Planetizen reported from county results. In the unofficial GoCodebook reproduction of the Santa Rosa City Code we reviewed in October 2026, we found a mobilehome rent control chapter (6-66) but no general rent stabilization or just-cause chapter for apartments and houses. We found no other city tenant protection ordinance as of October 2026 either, but confirm with the city’s Housing and Community Services department that nothing has been adopted since.
That leaves state law. Under the Tenant Protection Act, the Attorney General’s rent cap chart, updated July 16, 2026, shows a maximum increase of 8.6% for increases taking effect from August 1, 2026 through July 31, 2027 in counties not listed by metro area, which includes Sonoma County; the prior year’s figure was 7.7%. Whether a property is covered at all depends on its age, ownership and notices. Our guides to AB 1482 for landlords and just-cause eviction explain the exemptions and notice rules.
Outside city limits, or in Petaluma, different tenant rules can apply; our Sonoma County multifamily guide compares them. Confirm the parcel is inside Santa Rosa before relying on the city’s rules.
Source of income: the city ordinance landlords must know
Santa Rosa City Code chapter 10-46, the Housing Anti-Discrimination Code (Ordinance 2019-012), as shown in GoCodebook’s unofficial copy, bars rental decisions based wholly or partly on a tenant’s source of income, which it defines to include rental assistance such as Section 8 Housing Choice and HUD VASH vouchers.
A landlord may not refuse to rent, set different terms, advertise a preference or use an income standard that ignores the portion of rent an assistance program pays. The chapter allows a guarantor or co-signer requirement and has a narrow exception for renting a room to one boarder in an owner-occupied house, though the advertising rule still applies. Tenants may sue for damages and attorneys’ fees, and the city may enforce it. State fair housing law applies too, so screening criteria should be written down and applied the same way to every applicant.
Vacation rentals: plan on long-term leases
Santa Rosa’s short-term rental chapter, 20-48 of the zoning code, splits rentals into hosted and non-hosted. A hosted rental, where the host lives and sleeps in the home or in another legal unit on the parcel that is the owner’s main residence, is allowed in every zoning district with no citywide cap, one permit per owner.
Non-hosted, whole-home rentals are capped at 182 permits, the number falls as permits lapse, and the code says no new non-hosted applications will be accepted. Permits don’t transfer when a property is sold, apart from a narrow spouse or domestic-partner exception, and new permits can’t be issued for ADUs or junior ADUs. An investor buying in Santa Rosa should model long-term rent; county rules are covered in our post on vacation rental rules in Sonoma County.
Transfer tax and closing costs
A Santa Rosa sale pays two transfer taxes, according to the Sonoma County Recorder. The county charges $0.55 per $500 of value, less any loans assumed in the sale. The city adds $2.00 per $1,000, with no exemption for assumed loans; the city code counts debt that remains on the property as part of the consideration.
| Example sale price (illustration) | County tax | City tax | Total |
|---|---|---|---|
| $900,000 duplex | $990 | $1,800 | $2,790 |
| $1,800,000 fourplex | $1,980 | $3,600 | $5,580 |
| $4,000,000 apartment building | $4,400 | $8,000 | $12,400 |
The figures are our arithmetic and assume no loan is assumed. In Diamond’s North Bay markets the seller customarily pays transfer tax, but it’s negotiable and local custom varies, so settle it in the purchase contract. Our California transfer tax guide covers other cities.
Zoning, ADUs and where density is allowed
Most multifamily property in the city sits in the R-2 and R-3 residential districts and in mixed-use districts such as CMU, SMU, MMU and NMU, all of which appear in the city’s zoning code. Downtown, the Downtown Station Area Specific Plan, which the City Council updated in October 2020, covers Courthouse Square and Railroad Square and offers a floor area ratio bonus for projects that include affordable units or a childcare facility.
For a single-family lot, state ADU law and SB 9 can add units. Our guides to ADU rental income and SB 9 lot splits explain the rules and the math, and our Sonoma County commercial guide covers the city’s commercial and industrial districts for mixed-use buyers.
SMART station areas and SB 79
SMART lists three stations with Santa Rosa addresses: Santa Rosa Downtown at 7 4th Street, Santa Rosa North at 1500 Guerneville Road and Sonoma County Airport at 1130 Airport Boulevard. Rail access matters to tenants who commute, but don’t price a station-area parcel on state upzoning: ABAG’s SB 79 summary, updated July 1, 2026, lists only San Francisco, Alameda, San Mateo and Santa Clara as the Bay Area’s eligible counties. Our page on SB 79 transit upzoning explains why, and the city’s own station-area plans set what can be built near each stop.
Fire history, insurance and building condition
Parts of Santa Rosa were rebuilt after the 2017 fires, and a rebuilt building and a survivor next door can carry very different permit histories, insurance quotes and maintenance needs. For any rental, get the permit history and final inspections, check the parcel on CAL FIRE’s hazard maps, and get a landlord insurance quote before you remove contingencies.
Our guides to fire hazard severity zones and the California FAIR Plan cover the details.
We found no citywide rental registration or routine rental inspection chapter in the city code’s table of contents; the city does have a property maintenance code (chapter 18-20). Ask the city whether any inspection or registration rule has been added before you close.
Strategies that fit Santa Rosa
- Owner-occupied two to four units: live in one unit and rent the others; see our guide to house hacking in the North Bay.
- Single-family rental plus ADU: buy a house with a lot that can take a detached unit, and rent both long term.
- Older small apartment buildings: value comes from operations and capital work, so check AB 1482 coverage, deferred maintenance and the tenant files.
- Downtown or corridor mixed-use: ground-floor commercial with apartments above, where zoning and the specific plan allow.
Diamond manages some rental properties itself and works with partner property managers for others, and we find some opportunities through our own client database and targeted off-market campaigns, within MLS and Clear Cooperation rules. Diamond may refer you to partners we work with; you’re free to choose any provider.
This is general information, not legal or tax advice. Before you buy a Santa Rosa rental, have a California landlord-tenant attorney confirm which rent and eviction rules cover the property and a tax adviser review depreciation and reassessment.
Questions people ask
Does Santa Rosa have rent control?
Not for apartments or houses, as far as we found in October 2026. Voters rejected the city’s 2016 ordinance as Measure C in June 2017, so state law applies where a property is covered. Mobilehome park spaces have their own city chapter.
How much can I raise rent in Santa Rosa?
If the Tenant Protection Act covers the unit, the Attorney General’s chart shows 8.6% for increases taking effect August 1, 2026 through July 31, 2027 in counties like Sonoma that aren’t listed by metro area. Exempt properties aren’t capped by state law, though notice rules still apply.
Can I use a Santa Rosa investment property as an Airbnb?
Not as a whole-home rental. The city accepts no new non-hosted applications and existing permits don’t transfer on sale. A hosted rental is possible only if the owner lives on site.
What is the transfer tax on a Santa Rosa rental property?
The county charges $0.55 per $500, less assumed loans, and the city adds $2.00 per $1,000 with no exemption for assumed loans. On a $1,800,000 fourplex with no assumed loan that’s about $5,580 in total.
Can a Santa Rosa landlord refuse Section 8 vouchers?
No. City Code chapter 10-46 bars refusing to rent, or setting different terms, based on a tenant’s source of income, including Section 8 and HUD VASH vouchers.
Does SB 79 apply near Santa Rosa’s SMART stations?
Not according to ABAG’s July 2026 summary, which lists only San Francisco, Alameda, San Mateo and Santa Clara as eligible Bay Area counties.
Does Santa Rosa require rental inspections?
We found no citywide rental registration or routine inspection chapter in the city code as of October 2026. The property maintenance code still applies, so confirm with the city before you close.
If you’re looking at a Santa Rosa duplex, apartment building or rental house, we can run the numbers and the rule checks with you before you write an offer. Talk to Diamond about investment property.
Sources & notes
- U.S. Census Bureau: QuickFacts, Santa Rosa city, California
- Planetizen: Opponents of rent control claim victory in special election in Bay Area (June 18, 2017)
- GoCodebook (unofficial reproduction of Santa Rosa City Code): table of contents (October 2026)
- GoCodebook (unofficial reproduction): Santa Rosa City Code chapter 10-46, Housing Anti-Discrimination Code
- GoCodebook (unofficial reproduction): Santa Rosa Zoning Code chapter 20-48, Short-Term Rentals
- GoCodebook (unofficial reproduction): Santa Rosa City Code chapter 3-20, Real Property Transfer Tax
- County of Sonoma Clerk-Recorder: Documentary Transfer Tax
- California Attorney General: Rent cap chart (updated July 16, 2026)
- City of Santa Rosa: Downtown Station Area Specific Plan
- SMART: Stations
- ABAG: SB 79 summary (last updated July 1, 2026)
GoCodebook copies are unofficial reproductions of the city code; check the official code or ask the city before relying on a section. Transfer tax examples are our arithmetic.
Last reviewed October 2026 by Matthew Martinez.
