50 Birch St
Mill Valley 94941 · Mill Valley · Coordinates: 37.90066, -122.54871
Parcel & Assessor
- Lot size:
- 16,204 sq ft (0.37 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 50 BIRCH ST; 50 BIRCH ST UNIT A
Zoning & Land Use
RS-10 — Single Fam Res (min 10,000 SF) (Mill Valley)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RS-10 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RS-10, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RS-10, a single-family residential zone. The lot is 16,204 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
- High Fire Hazard Severity Zone (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (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: $2,002,000 – $2,708,000 · 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
Nearby Activity (½ mile radius, since October 2024)
15 active or recent development projects (18 housing units across completed, permitted, and pipeline stages) and 165 total building permits recorded within ½ mile.
- New construction5 permits
- Adds housing (ADU)5 permits (5 units)
- Demolition1 permit
- Additions & renovations11 permits
- Building systems109 permits
- Repairs10 permits
- Other24 permits
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)On this parcel
Active in "Entitled" for 6.2 yr (first record Aug 11, 2020) with no new permit activity recorded in 6.2 yr. High-impact scale (1 housing unit, 1 deed-restricted affordable across 0 permits).
- New home (Issued)On this parcel
Active in "Issued" for 4.5 yr (first record Apr 29, 2022) with no new permit activity recorded in 2.8 yr.
- New home at 2 Hart Ln (Issued)160 ft S
Active in "Issued" for 6.9 yr (first record Dec 18, 2019) with no new permit activity recorded in 5.8 yr. High-impact scale (1 housing unit, $750,000 declared valuation across 1 permit).
- Accessory dwelling unit at 408 Laverne Ave (adu 408a) (Issued)0.23 mi S
Active in "Issued" for 2.3 yr (first record Jul 12, 2024) with no new permit activity recorded in 14 mo. High-impact scale (1 housing unit, $2,700,000 declared valuation across 1 permit).
Permit & Project History on This Parcel (0 permits, 2 grouped projects)
No building permits recorded on this parcel in our dataset.
State HCD Housing Element APR records on this parcel: 3 entries (report years 2020, 2022, 2024).