Duboce Triangle, SF Real Estate & Homes for Sale
Duboce Triangle is the wedge of San Francisco blocks bounded by Duboce Avenue, Castro Street and Market Street, just below Buena Vista Park. Most homes are flats and condominium units in buildings from around 1900, next to the Duboce Park Historic District, so rent ordinance status and liquefaction disclosures deserve a close look.
Explore Duboce Triangle, SF real estate and homes for sale with this local guide. Contact Diamond to discuss your criteria and current property-search options.
| County | San Francisco (City and County) |
|---|---|
| Local government | San Francisco Planning |
| Housing | Flats and condos in buildings from around 1900 |
| Hazards to check | State liquefaction mapping affects some blocks |
| Local rules | Duboce Park Article 10 Historic District next door; rent ordinance |
Duboce Triangle is the wedge of blocks bounded by Duboce Avenue on the north, Castro Street on the west and Market Street on the southeast, just below Buena Vista Park.
The name honors Victor Duboce, a lieutenant colonel of the First California Volunteer Infantry in the Spanish–American War. A 2006 city neighborhood map drew the northern line at Waller Street, taking in Duboce Park, but the MLS and Assessor stop at Duboce Avenue.
Duboce Triangle homes for sale
Duboce Triangle market report
Built almost entirely before the earthquake
Compare the particular property’s lot dimensions, permitted living area, construction history and ownership form using current records. Assessment classifications do not certify legal use or current listing availability.
Wikipedia describes many of the buildings as 1906-era flats in the classic revival style, and the oldest designated house is the Duboce Triangle Greek Revival Home at 2173 15th Street, built in 1875 and made a city landmark in 2026.
Our guide to Victorian and Edwardian homes covers what to look for in houses and flats of this era.
Duboce Park, the tunnel portal and the historic district next door
Duboce Park, about 4.3 acres in Planning’s open-space layer, lies across Duboce Avenue on the triangle’s northern edge. The Sunset Tunnel’s east portal opens on the park’s south side at Duboce and Noe streets; the tunnel opened on October 21, 1928, runs 4,232 feet to Cole Valley and carries only the N Judah.
The Duboce Park Historic District, designated under Article 10 of the Planning Code, covers 87 properties, 79 of them contributors, built mainly from 1896 to 1913. Planning’s description ties the area’s building boom to cable car lines of the late 1880s, with most of it complete by 1906.
Planning’s map places that district on the blocks just north of Duboce Avenue, outside the 5J line. Inside the subdistrict, preservation review applies to individually designated buildings such as the 15th Street Greek Revival house; for any other address, check Planning’s records.
Zoning: RH-3 blocks and the Upper Market corridor
The Upper Market Street Neighborhood Commercial Transit District (Planning Code Section 764) runs along Market from Church to Noe Street and onto the side streets. It requires ground-floor commercial space on Market and Church, sets no minimum car parking, allows up to 0.5 residential spaces per unit as of right and bars new driveways onto Market Street east of Castro.
- Area plan: a point near 14th and Sanchez streets falls in the Market and Octavia plan area on Planning’s layer.
- Unit size: the triangle lies inside the perimeter of the Central Neighborhoods Large Residence SUD, whose 3,000-square-foot unit cap matters most to the few single-family owners planning additions.
This is general information, not legal advice; confirm a lot’s districts on Planning’s map or with a land use attorney.
Transit at the triangle’s corners
Few District 5 neighborhoods have this much rail within a few blocks. The N Judah runs along Duboce Avenue to the tunnel portal, and Church and Castro stations on the Market Street subway sit at its corners, with the F Market & Wharves ending at 17th and Castro.
- 22 Fillmore: stops at Church and Duboce and at Church and Market, then runs east on 16th Street toward Mission Bay.
- 37 Corbett: runs along 14th Street with stops at Church, Sanchez, Noe and Castro before climbing Roosevelt Way.
- Bicycles: the Planning Code describes Market Street as a major bicycle corridor.
Check SFMTA for current service before relying on a line.
Liquefaction mapping and the older apartment buildings
Planning’s liquefaction layer, which reproduces the state’s seismic hazard zones, includes a band that crosses the triangle from about Noe Street east to Church Street, roughly from just south of Duboce Avenue to near 15th Street along the 14th Street blocks, and continues east toward Mission Dolores. A test point near 14th and Sanchez falls inside it; the edge is irregular, so check each parcel.
A mapped zone does not mean a building will fail, but it shapes what buyers ask about foundations and what a structural engineer will look at. Our hazard maps guide covers EQ Zapp and the other lookups.
The 81 buildings of five or more units deserve a second check. DBI’s soft-story program applies to wood-frame buildings with five or more units, of three or more stories or two over a basement, whose construction permit was applied for before January 1, 1978; ask whether the retrofit is complete and signed off.
Selling a home in Duboce Triangle
Most sales here are condominium units, TIC interests or flats in two- to six-unit buildings. Buyers compare light, floor height and layout from one floor to the next, and they read the building’s paperwork as closely as the unit.
- Building documents: HOA budget, reserves, minutes and CC&Rs for condos; the TIC agreement and loan terms for a tenancy-in-common share.
- Unit history: permits showing how and when the building was divided, and whether any unit is unwarranted; see our guide to unwarranted units.
- Tenancy status: rent ordinance coverage of any occupied unit in the building.
- Seismic file: the liquefaction disclosure and, for larger buildings, soft-story compliance.
Our TIC guide and condo guide explain those documents, the San Francisco multifamily guide covers whole buildings, and the selling requirements page lists the city’s sale-time items. Diamond may refer you to partners we work with, such as TIC lenders or inspectors; you’re free to choose any provider.
Questions people ask
What are the boundaries of Duboce Triangle?
Duboce Avenue on the north, Castro Street on the west and Market Street on the southeast. A 2006 city map extended it north to Waller Street to include Duboce Park.
Is Duboce Triangle a historic district?
Not as a whole. The Duboce Park Historic District sits just north of Duboce Avenue, and a few buildings inside the triangle are individual landmarks.
Are most homes condos?
Use current listings to identify the property type you need, then verify its ownership form, legal unit count and any recorded restrictions.
Is Duboce Triangle in a liquefaction zone?
Part of it is. Planning maps a liquefaction band roughly between Noe and Church streets, around 14th Street from just south of Duboce Avenue to near 15th Street. Check the specific parcel.
What transit serves Duboce Triangle?
The N Judah on Duboce Avenue, Church and Castro stations, the F line, the 22 Fillmore on Church Street and the 37 Corbett on 14th Street.
If you are buying or selling a flat, condo or TIC share in the triangle, we can walk through the building documents and recent sales with you. Contact us, compare Corona Heights, Eureka Valley and Mission Dolores nearby, or step back to the District 5 overview and the San Francisco guide.
Permits, additions and ADUs in Duboce Triangle
For a house or flat building here, the rule that most often shapes a remodel is the Central Neighborhoods Large Residence Special Use District. Its perimeter takes in the triangle, and inside it no residential development or expansion may produce a dwelling unit of more than 3,000 square feet of gross floor area (Planning Code §249.92, third-party reproduction). Three details matter to a buyer:
- The cap does not apply when the total increase in an existing unit’s floor area is less than 15%.
- Increases count cumulatively over building permits issued in the previous 10 years (permits issued before January 1, 2022 excepted).
- Unpermitted construction counts toward floor area no matter when it was built.
So the permit history of a house you are buying affects what you can add later. Pull the 3R report, which the seller must provide, and compare it with the floor plan (SF.gov: 3R report).
A second unit is often the alternative to a larger single unit. SF Planning’s State ADU Program is ministerial, decided within 60 days of a complete application; its Local Program can waive some Planning Code rules in existing buildings but puts the ADU under rent control and isn’t available after an owner move-in eviction in the past five years or another no-fault eviction in the past ten (SF Planning: ADUs). Check zoning and permit history on the Property Information Map. Review periods apply to qualifying complete applications and the applicable state pathway, with statutory exceptions; they do not guarantee that a proposed unit is feasible or that a building permit will be issued. Confirm the current requirements with the permit agency and HCD.
Buying or converting a flat in Duboce Triangle
About 410 of the triangle’s parcels are condominium units, most of them in converted buildings from around 1906, and about 140 more are two-unit flat buildings. If you are buying one flat of a pair held as a tenancy in common, the City’s conversion rules decide whether it can become a condo. Past evictions or buyouts can disqualify a building. Our TIC guide covers group loans and fractional financing.
Condominium conversion needs a building-specific eligibility review. San Francisco Public Works has a separate two-unit residential conversion process and publishes distinct Expedited Conversion Program updates. A historical lottery limit or ECP description is not a standing right to convert. Before assigning value to conversion, have Public Works confirm the actual pathway, ownership and occupancy history, tenant protections, eviction/buyout restrictions and any unauthorized-unit issue.
Units in older apartment buildings with pre-June 1979 occupancy often carry rent increase limits and just-cause eviction protection (SF.gov: rental laws). Condo units rented to a tenant who moved in on or after January 1, 1996 generally have eviction protection but not rent increase limits, which matters if you buy a converted flat with a tenant in place. Wood-frame buildings of five or more units over a soft story, with an original permit applied for before 1978, fall under the Mandatory Soft Story Retrofit Program; ask for the building’s compliance status (SF soft story program).
Luxury homes and estates in Duboce Triangle
At the high end, Duboce Triangle property means the restored single-family Victorians and Edwardians, most built before 1906, and top-floor flats in converted buildings near Duboce Park and Buena Vista Park. RH-3 is the most common zoning, and the 3,000-square-foot unit cap in the Large Residence SUD limits how far any house can be enlarged (§249.92). Individually designated buildings, such as the 1875 Greek Revival house at 2173 15th Street, need Article 10 review for exterior work, while the Duboce Park Historic District lies across Duboce Avenue, outside the triangle, so confirm which side of that line a park-facing house is on (Article 10).
The due diligence that matters most: the floor-area record under the SUD; foundation and framing in a house more than a century old; the liquefaction mapping that affects some blocks, checked by block and lot on the Property Information Map; and the transfer tax tier, which is $3.75 per $500 from $1 million to under $5 million and $11.25 above that (SF.gov: Transfer tax). See insuring a high-value home, earthquake insurance and Victorian and Edwardian homes.
Owners who want privacy can sell without public marketing. Ask Diamond Real Estate Group which permitted private-marketing options fit your property, goals and the applicable MLS rules. Availability of any particular listing is not guaranteed. Related reading: private sales · San Francisco luxury homes. We do not promise that any particular property is available.
The Local ADU eviction lookbacks have a specific exception for temporary capital-improvement evictions when the required declaration preserves the tenant’s right to reoccupy. Confirm the actual eviction history and chosen program with Planning.
Historic review depends on the designating ordinance and scope of work. Ordinary in-kind maintenance/repair can be exempt from a Certificate of Appropriateness, and some minor work has an administrative review path.
For a Large Residence SUD project, confirm the mapped boundary, application-date exceptions and the code’s floor-area calculation before relying on a summary. Qualifying state-law housing paths require their own eligibility review.
Assessment records are a starting point for checking a property, not a certification of legal use or a live listing inventory. Verify current permits, recorded ownership documents and any affordability restrictions.
Mandatory soft-story coverage also depends on construction type, the original permit date, stories above a partly above-grade basement/underfloor area, the soft-story condition and any qualifying prior strengthening. Confirm the actual DBI screening and compliance record.
Sources for this section
- SF Planning Code §249.92, Central Neighborhoods Large Residence SUD (gocodebook reproduction) — https://codelibrary.amlegal.com/codes/san_francisco/latest/sf_planning/0-0-0-65648
- SF.gov: Request a Report of Residential Building Record (3R) — https://www.sf.gov/request3r
- SF Planning: Accessory Dwelling Units — https://sfplanning.org/accessory-dwelling-units
- SF Planning: Property Information Map — https://sfplanninggis.org/pim/
- SF Planning: Condominium conversion restrictions — https://sfpublicworks.org/services/citysurveyor
- SF.gov: Learn about San Francisco rental laws — https://sf.gov/learn-about-san-francisco-rental-laws
- City and County of San Francisco: Mandatory Soft Story Program — https://sfgov.org/sfc/esip/soft-story
- SF Planning Code Article 10 (gocodebook reproduction) — https://codelibrary.amlegal.com/codes/san_francisco/latest/sf_planning/0-0-0-27871
- SF.gov: Transfer tax — https://www.sf.gov/transfer-tax
Sources & notes
- DataSF / SF Assessor-Recorder: Assessor Historical Secured Property Tax Rolls, 2025 closed roll (parcel counts, property classes, build years, zoning codes and street addresses by neighborhood code, queried October 2026)
- San Francisco Planning: PlanningData map service (special use districts, Article 10 historic districts, landmarks, open space, area plans, cultural districts, seismic hazard zones; queried October 2026)
- San Francisco Planning Code (via GoCodebook): Sec. 764, Upper Market Street Neighborhood Commercial Transit District
- San Francisco Planning Code (via GoCodebook): Sec. 249.92, Central Neighborhoods Large Residence Special Use District
- Wikipedia: Duboce Triangle, San Francisco (boundaries and name; background only)
- Wikipedia: Sunset Tunnel (portals and opening date)
- SFMTA: 22 Fillmore route (streets and stops)
- SFMTA: 37 Corbett route (streets, stops and service hours)
- Wikipedia: Castro station (location, opening date, lines)
- SF Department of Building Inspection: Mandatory Soft Story Retrofit Program
Last reviewed October 2026 by Matthew Martinez.
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