360 Marin Ave
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.87772, -122.53248
Parcel & Assessor
- Lot size:
- 6,926 sq ft (0.16 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 360 MARIN AVE
Zoning & Land Use
R1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotPossible, with conditions
Zoned R1, a single-family residential zone. FEMA regulatory floodway covers all of the lot: SB 9 requires a no-rise certification.
- SB 9: split into two lotsPossible, with conditions
Zoned R1, a single-family residential zone. The lot is 6,926 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original. FEMA regulatory floodway covers all of the lot: SB 9 requires a no-rise certification.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- High Fire Hazard Severity Zone (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone AE: regulatory floodway (Special Flood Hazard Area) (all of the lot) · FIRM panel 06041C0468F, 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: $1,841,000 – $2,343,000 · 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
- Accessory dwelling unit at 403 Marin Ave (adu 403a) (Issued)0.18 mi W
Active in "Issued" for 2.9 yr (first record Dec 21, 2023) with no new permit activity recorded in 18 mo. High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- New home at 407 Spruce St (Issued)0.21 mi NW
Active in "Issued" for 7.6 yr (first record Mar 14, 2019) with no new permit activity recorded in 7.4 yr. High-impact scale (1 housing unit, $750,000 declared valuation across 1 permit).
- New home at 334 Dolan Ave (Issued)0.27 mi NE
Active in "Issued" for 8.1 yr (first record Sep 5, 2018) with no new permit activity recorded in 7.9 yr. High-impact scale (1 housing unit, $759,000 declared valuation across 1 permit).
- New home at 469 W Live Oak Dr (aka 461) (Issued)0.41 mi W
Active in "Issued" for 6 yr (first record Oct 22, 2020) with no new permit activity recorded in 21 mo. High-impact scale (1 housing unit, $980,000 declared valuation across 1 permit).
Permit & Project History on This Parcel (4 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 93695 | Accessory dwelling unit (new or conversion) | Applied | App. Nov 7, 2025 | $690,000 | Addition;; Remodel; Seismic Work; Decks; Raise 1st Fl Above Flood Level; Attached A D U |
| 84910 | New garage / accessory structure | Applied | App. Dec 18, 2019 | $150,000 | Remod, Addtn, Porch T.D. 1-3-20 |
| 149056 | Plumbing / water heater / sewer | Issued | Iss. Sep 21, 2015 | $1,550 | Repl Water Heater***Expired |
| 148654 | Roof replacement | Issued | Iss. Sep 1, 2015 | $11,900 | Roof Tear Off, Re-Roof Comp Shingle-E-Permit |