4100 Folsom St
San Francisco · Bernal Heights · San Francisco · Coordinates: 37.73580, -122.41378
Parcel & Assessor
- Lot size:
- —
- Assessor use:
- —
- Addresses on lot:
- 4100 FOLSOM 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 1,750 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: $1,504,000 – $2,034,000 · 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 (28 housing units across completed, permitted, and pipeline stages) and 918 total building permits recorded within ½ mile.
- New construction2 permits (2 units)
Developments Deserving Closer Investigation & Active Area Builders
- 4 new homes at 434 Cortland Ave (Applied)0.27 mi NW
Active in "Applied" for 4.8 yr (first record Jan 19, 2022) with no new permit activity recorded in 2.2 yr. High-impact scale (4 housing units, $2,078,100 declared valuation across 2 permits).
- 432 Cortland Avenue (Issued)0.28 mi NW
Active in "Issued" for 9.1 yr (first record Sep 7, 2017) with no new permit activity recorded in 2.7 yr. High-impact scale (3 housing units, $1,420,000 declared valuation across 2 permits).
- New duplex at 816 Silliman St (Applied)0.46 mi S
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).
- New home at 40v Nevada St (Issued)0.45 mi N
Active in "Issued" for 6.2 yr (first record Aug 27, 2020) with no new permit activity recorded in 10 mo. High-impact scale (1 housing unit, $838,995 declared valuation across 1 permit).
Permit & Project History on This Parcel (2 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 202111031758 | Accessory dwelling unit (new or conversion) | complete | Iss. Jul 5, 2024 | $358,491 | add adu unit at ground floor per government code section 65852.2. new rear deck, remodel interior staircase and 2nd floo… |
| 202006299330 | Roof replacement | complete | Iss. Jul 23, 2020 | $13,900 | reroofing-tearoff existing roof to wood sheathing and reroof using: modified bitumen membrane roofing system along with … |
State HCD Housing Element APR records on this parcel: 2 entries (report years 2024, 2025).