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

What multifamily in Orinda looks like

Orinda is one of the most single-family cities in the Bay Area, so multifamily property is scarce. Most of it sits near downtown and the BART station:

• A small number of condominium and townhouse complexes in the RM district, many with units rented by individual owners
• Senior housing on overlay sites
• Single-family homes with ADUs, which are allowed in every residential district
• New apartment sites created by the 2025 rezoning, including RH districts and downtown mixed-use districts

Because supply is thin, many investors here start with a single-family home and an ADU, or with a condo. For larger purchases, see financing 2-4 unit properties and apartment building loans.

Where the zoning allows it

Districts and densities come from Chapter 17.3 and the standards schedule in Chapter 17.4. Ordinance 25-04, adopted November 3, 2025, added the RH districts.

Multifamily standards. In RM and RH, multifamily is a permitted use subject to added rules. Under Section 17.3.11, projects must meet design review standards and three sets of development standards, to the extent state law allows. RM requires 150 sq ft of private open space and 100 sq ft of shared open space per unit, plus lockable storage. Buildings of eight or more units need a shared gathering room.

Duplexes. Chapter 17.3’s use table does not list duplexes, so the Zoning Administrator classifies them case by case. Single-family districts allow an ADU, and SB 9 projects are possible where state law applies.

ADUs. ADUs are permitted by right in every residential district. A complete ADU or JADU application is processed ministerially within 60 days. ADUs are exempt from the city’s residential floor area limits but are capped at 850 or 1,000 adjusted sq ft. They may only be rented for 30 days or more. See our ADU investment guide and SB 9 lot split guide. Many Orinda hillside lots are in fire hazard areas, which can affect SB 9 eligibility, so check each parcel.

Rent rules: state law only

Orinda is not on the California Attorney General’s list of cities with local rent caps. In Contra Costa County that list names only Antioch, Concord and Richmond. Covered units follow the Tenant Protection Act cap for the San Francisco Area: 6.3% for August 1, 2025 through July 31, 2026, and 8.8% for August 1, 2026 through July 31, 2027. Buildings first occupied within 15 years are exempt, as are qualifying single-family homes and condos with the required lease notice. That covers much of Orinda’s rental stock. See our AB 1482 guide.

State just cause rules apply after 12 months of tenancy, with one month’s rent as relocation help for no-fault terminations. We did not find a local tenant protection ordinance in the code’s title list, so confirm with the city. See our just cause eviction guide.

Orinda rental property rules

Short-term rentals. Orinda regulates stays of less than 30 days under Section 17.3.12:

• Registration. Operators must register before they start, renew every year and pay a non-refundable fee. Registration does not transfer to a new owner.
• Hosting. Only hosted stays are allowed. The host must live on the property, be there overnight and meet guests.
• Stay and occupancy limits. Stays must be at least two nights. Occupancy is capped at two people per bedroom plus three, and only one rental may run on a lot at a time.
• Excluded units. Short-term rentals are prohibited in SB 9 units, and ADUs may only be rented for 30 days or more.

An investor cannot run an apartment or ADU as a vacation rental in Orinda.

Home occupations. Home occupations are allowed in RVL, RL and RH but not in RM. That matters for condo and townhouse tenants who want to work from a unit with clients visiting.

Dual structures. Building a new house on a lot that already has one requires a dual-structure permit. The owner must agree in writing, and record the agreement, that the old house will be demolished.

Hillsides, fire and older buildings

Orinda’s hills mean grading, drainage, tree and view rules come up on almost any project. Title 17 has hillside, ridgeline, heritage tree and view preservation chapters. Older condo and apartment buildings of three or more units with elevated decks or walkways need SB 721 inspections. We did not find a mandatory Orinda soft-story program, but a seismic retrofit review is worthwhile for buildings over parking. Orinda’s Chapter 3.08 sets a city transfer tax of $0.275 per $500, administered by the County Recorder within the county’s $0.55. Confirm with escrow. Wildfire insurance cost is a real underwriting item here.

Underwriting an Orinda multifamily purchase

1. Confirm the district and whether the 2025 rezoning (RH, DCOR or DG) changed what the site allows.
2. For condos, check HOA rental limits as well as city rules.
3. Confirm each unit’s AB 1482 status and model rent increases at no more than the state cap.
4. Make sure no ADU or unhosted unit is being run as a short-term rental.
5. Get estoppel certificates and wildfire insurance quotes early.
6. Add reassessed property tax, SB 721 work and any seismic items to your rental property analysis.

Questions people ask

Sources & notes

1. Orinda Municipal Code Title 17 (GoCodebook, October 2026 edition): Chapter 17.3, Chapter 17.4, Chapter 17.8
2. Orinda Chapter 3.08, Documentary Transfer Tax
3. California Attorney General, Rent Caps

Note: Parking ratios in Chapter 17.16, the Objective Design Standards, local SB 9 procedures and the short-term rental fee amount were not reviewed.

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

Related: Orinda real estate guide · Commercial real estate in Orinda · Multifamily investing guide · Investor services