531 Tennessee Valley Rd
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.87230, -122.52532
Parcel & Assessor
- Lot size:
- 60,200 sq ft (1.38 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 531 TENNESSEE VALLEY RD; 535 TENNESSEE VALLEY RD
Zoning & Land Use
RA-B4 — Residential Agriculture (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RA-B4 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotCan't tell
Zoned RA-B4 (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
- SB 9: split into two lotsCan't tell
Zoned RA-B4 (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- High Fire Hazard Severity Zone (State Responsibility Area) (all of the lot, map Apr 1, 2024)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (about 99% of the lot) · FIRM panel 06041C0507E, effective March 16, 2016
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $2,035,000 – $2,591,000 · Status: Off market
HUD Small Area FMR (ZIP 94941) · FY 2026
Studio $2,730 · 1BR $3,270 · 2BR $3,960 · 3BR $5,060 · 4BR $5,240
Developments Deserving Closer Investigation & Active Area Builders
- New home at 535 Tennessee Valley Rd (adu 531) (Issued)On this parcel
Active in "Issued" for 6 yr (first record Oct 29, 2020) with no new permit activity recorded in 4 yr. High-impact scale (1 housing unit, $800,000 declared valuation across 1 permit).
- Demolition at 531 Tennessee Valley Rd (Issued)On this parcel
Active in "Issued" for 5.1 yr (first record Oct 7, 2021) with no new permit activity recorded in 4.8 yr.
- New commercial building at 203 Marin Ave (Applied)0.28 mi N
Active in "Applied" for 9.6 yr (first record Mar 20, 2017) with no new permit activity recorded in 9.6 yr.
- Accessory dwelling unit at 355 Carrera Dr (Applied)0.31 mi SW
Active in "Applied" for 12 mo (first record Oct 21, 2025) with no new permit activity recorded in 12 mo.
Permit & Project History on This Parcel (5 permits, 2 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 180472 | New garage / accessory structure | Issued | Iss. Nov 12, 2025 | $40,000 | 10,000 Gal Water Storage Tank On Concrete Pad |
| B36973 | Solar / battery storage | Issued | Iss. Feb 9, 2024 | $20,000 | install 6.08kw, with 15 solar panels. |
| 172683 | New single-family home | Issued | Iss. Nov 7, 2022 | $800,000 | New Sfd, Garage, Decks |
| 170352 | Demolition |