2639 21st Ave
San Francisco · Sunset/Parkside · San Francisco · Coordinates: 37.73845, -122.47785
Parcel & Assessor
- Lot size:
- —
- Assessor use:
- —
- Addresses on lot:
- 2639 21ST AVE; 2639A 21ST AVE
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 lotsLikely eligible
Zoned RH-1, a single-family residential zone. The lot is 2,999 sq ft on the parcel map, room for two lots of at least 1,200 sq ft, each at least 40% of the original.
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 0602980230A, 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: $1,837,000 – $2,485,000 · 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)
15 active or recent development projects (19 housing units across completed, permitted, and pipeline stages) and 580 total building permits recorded within ½ mile.
- Adds housing (ADU)9 permits (10 units)
Developments Deserving Closer Investigation & Active Area Builders
- 1221 Vicente Street (Entitled)0.13 mi W
Active in "Entitled" for 3.9 yr (first record Dec 16, 2022) with no new permit activity recorded in 2.2 yr. High-impact scale (3 housing units, $1,300,000 declared valuation across 2 permits).
- 3 new homes at 1420 Taraval St (Applied)0.38 mi NW
Active in "Applied" for 8.2 yr (first record Aug 8, 2018) with no new permit activity recorded in 6.7 yr. High-impact scale (3 housing units, $1,800,000 declared valuation across 2 permits).
- New home at 2689 23rd Ave (Issued)0.13 mi SW
Active in "Issued" for 4.8 yr (first record Dec 22, 2021) with no new permit activity recorded in 4.8 yr.
- Accessory dwelling unit at 2519 20th Ave (Applied)0.16 mi N
Active in "Applied" for 6.1 yr (first record Sep 21, 2020) with no new permit activity recorded in 6.1 yr.
Permit & Project History on This Parcel (5 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 202511210225 | Accessory dwelling unit (new or conversion) | complete | Iss. Nov 24, 2025 | $1 | reference pa#202308285403 & 202309015793: administrative permit to correct/proposed dwelling unit count as "3". single f… |
| 202308285406 | Accessory dwelling unit (new or conversion) | complete | Iss. Apr 19, 2024 | $60,571 | legalize existing conditioned space as a 1-bedroom accessory dwelling unit(adu). 382 sq ft. per ordinace 95-17 |
| 202309015793 | Accessory dwelling unit (new or conversion) | complete | Iss. Apr 10, 2024 | $53,810 | legalize unit under city ordinance # 43-14 (unit a)1. legalize ground floor unauthorized dwelling unit per city ordinanc… |
| 202212138144 | Accessory dwelling unit (new or conversion) |