1342 21st Ave
San Francisco · Sunset/Parkside · San Francisco · Coordinates: 37.76265, -122.47888
Parcel & Assessor
- Lot size:
- —
- Assessor use:
- —
- Addresses on lot:
- 1342 21ST AVE; 1342A 21ST AVE
Zoning & Land Use
RTO-C — RESIDENTIAL TRANSIT ORIENTED DISTRICT - C (Commercial)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RTO-C (multifamily residential): state law allows ADUs where homes are allowed. On a multifamily lot the state allowance is different: ADUs in non-living space of the building, plus up to eight detached ADUs.
- SB 9: two homes on the lotUnlikely
Zoned RTO-C (multifamily residential), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned RTO-C (multifamily residential), not a single-family residential zone.
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 0602980113A, 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: $1,476,000 – $1,998,000 · 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)
22 active or recent development projects (25 housing units across completed, permitted, and pipeline stages) and 671 total building permits recorded within ½ mile.
- Adds housing (ADU)16 permits (16 units)
Developments Deserving Closer Investigation & Active Area Builders
- 90 new homes at 2550 Irving St (Issued)0.34 mi W
Active in "Issued" for 4.5 yr (first record May 5, 2022) with no new permit activity recorded in 2.4 yr. High-impact scale (90 housing units, 89 deed-restricted affordable, $50,000,000 declared valuation across 3 permits).
- New duplex at 1347 27th Ave (Issued)0.39 mi W
Active in "Issued" for 7.6 yr (first record Apr 2, 2019) with no new permit activity recorded in 2.1 yr. High-impact scale (2 housing units, $1,456,560 declared valuation across 3 permits).
- Accessory dwelling unit at 1371 20th Ave (Applied)210 ft SE
Active in "Applied" for 3.6 yr (first record Mar 23, 2023) with no new permit activity recorded in 3.6 yr.
- Accessory dwelling unit at 1322 20th Ave (Applied)340 ft NE
Active in "Applied" for 4.7 yr (first record Mar 2, 2022) with no new permit activity recorded in 4.6 yr.
Permit & Project History on This Parcel (2 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 202605181481 | Accessory dwelling unit (new or conversion) | issued | Iss. Sep 10, 2026 | $66,859 | convert (e) bedroom & bathroom on 1/f to new adu under state adu program. no changes to elevation & ceiling heights. |
| 202512081247 | Remodel / interior alteration | complete | Iss. Dec 8, 2025 | $10,000 | ground floor: install drywall replacement on ceiling with insulation. 5/8 - inch gyp, type x. |