256 Sweeny St
San Francisco · Portola · San Francisco · Coordinates: 37.73239, -122.41044
Parcel & Assessor
- Lot size:
- —
- Assessor use:
- —
- Addresses on lot:
- 256A SWEENY ST; 256 SWEENY ST
Zoning & Land Use
RH-1 — RESIDENTIAL- HOUSE, ONE FAMILY (Residential)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RH-1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RH-1, a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned RH-1, a single-family residential zone. The lot is 1,875 sq ft on the parcel map; a split needs at least 2,400 sq ft (two lots of 1,200 sq ft or more).
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 0602980231A, effective March 23, 2021
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,243,000 – $1,681,000 · Status: Off market
HUD Metro FMR (San Francisco, CA HUD Metro FMR Area) · FY 2026
Studio $2,485 · 1BR $2,977 · 2BR $3,604 · 3BR $4,604 · 4BR $4,772
Nearby Activity (½ mile radius, since October 2024)
21 active or recent development projects (33 housing units across completed, permitted, and pipeline stages) and 663 total building permits recorded within ½ mile.
- Adds housing (ADU)9 permits (19 units)
- Demolition2 permits
Developments Deserving Closer Investigation & Active Area Builders
- Accessory dwelling unit at 256 Sweeny St (Issued)On this parcel
Active in "Issued" for 17 mo (first record Jun 6, 2025) with no new permit activity recorded in 12 mo.
- New duplex at 816 Silliman St (Applied)0.28 mi SW
Active in "Applied" for 4.7 yr (first record Mar 1, 2022) with no new permit activity recorded in 4.7 yr. High-impact scale (2 housing units, $1,250,000 declared valuation across 1 permit).
- Accessory dwelling unit at 338a Sweeny St (Issued)440 ft W
Active in "Issued" for 6 yr (first record Oct 15, 2020) with no new permit activity recorded in 4.7 yr.
- 2 new homes at 139a Sweeny St (Issued)0.13 mi E
Active in "Issued" for 9 yr (first record Nov 13, 2017) with no new permit activity recorded in 3.1 yr.
Permit & Project History on This Parcel (2 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 202607295739 | Plan revision / deferred submittal | issued | Iss. Aug 24, 2026 | $22,000 | revision to permit 202506118403. change 2nd floor walk-in closet to full bath. non-structural interior work only. |
| 202506118403 | Accessory dwelling unit (new or conversion) | issued | Iss. Nov 5, 2025 | $261,142 | (n) 2-story horizontal addition at rear yard: add a 2 bedrooms, 2 bathrooms state program adu with family room, kitchen … |
State HCD Housing Element APR records on this parcel: 2 entries (report years 2025).