215 A Gibson Ave
Mill Valley 94941 · Almonte · Unincorporated Marin · Coordinates: 37.88142, -122.52737
Parcel & Assessor
- Lot size:
- 6,098 sq ft (0.14 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 215A GIBSON AVE; 215 GIBSON AVE
Zoning & Land Use
R1-B1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B1, a single-family residential zone. The lot is 6,098 sq ft by the assessor, 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 06041C0469F, 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: $1,976,000 – $2,514,000 · 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 215 Gibson Ave (Issued)On this parcel
Active in "Issued" for 15 mo (first record Jul 15, 2025) with no new permit activity recorded in 10 mo.
- New home at 217 Cleveland Ave (Issued)0.26 mi N
Active in "Issued" for 9.7 yr (first record Feb 21, 2017) with no new permit activity recorded in 2.3 yr. High-impact scale (1 housing unit, $875,000 declared valuation across 1 permit).
- Accessory dwelling unit at 131 Yale Ave A (Issued)0.46 mi N
Active in "Issued" for 4.8 yr (first record Jan 19, 2022) with no new permit activity recorded in 3.4 yr. High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- New home at 407 Spruce St (Issued)0.5 mi W
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).
Permit & Project History on This Parcel (4 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B47031 | Electrical / panel | Issued | Iss. Jun 4, 2026 | $4,500 | Service Upgrade |
| 94239 | Electrical / panel | Applied | App. May 26, 2026 | $4,500 | 200 Amp Panel Upgrade. New Grounding And Bonding. |
| 180763 | Addition (adds square footage) | Issued | Iss. Dec 22, 2025 | $225,000 | Structural Conversion Of Garage To A D U; Shearwall In Storage Area |
| B10811 | Roof replacement | Issued | Iss. Aug 11, 2016 | $8,900 | REROOF - OVERLAY — ReRoofing; With Electronic Inspection |