309 Poplar St
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.87867, -122.53386
Parcel & Assessor
- Lot size:
- 12,110 sq ft (0.28 ac)
- Assessor use:
- Tax Exempt
- Addresses on lot:
- 309 POPLAR ST
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 12,110 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) (about 94% of the lot, map Mar 24, 2025); Moderate Fire Hazard Severity Zone (Local Responsibility Area) (about 6% of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: 0.2% annual chance flood hazard (shaded X) (about 24% of the lot); Zone X: minimal flood hazard (about 76% 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: $1,923,000 – $2,447,000 · 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
- Demolition at 309 Poplar St (Issued)On this parcel
Active in "Issued" for 5.4 yr (first record Jun 21, 2021) with no new permit activity recorded in 4.1 yr.
- Accessory dwelling unit at 403 Marin Ave (adu 403a) (Issued)0.11 mi SW
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 469 W Live Oak Dr (aka 461) (Issued)0.36 mi SW
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).
- New home at 731 Bay Rd (Issued)0.37 mi W
Active in "Issued" for 18 mo (first record May 12, 2025) with no new permit activity recorded in 14 mo. High-impact scale (1 housing unit, $955,000 declared valuation across 1 permit).
Permit & Project History on This Parcel (7 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 172472 | Demolition | Issued | Iss. Oct 3, 2022 | $15,000 | Decommission Cell Site - Remove Sprint Wireless Equipment; Patch Roof |
| 172372 | Commercial tenant improvement | Issued | Iss. Sep 20, 2022 | $500,000 | Seismic Retrofit, Foundations, Interior Remod, New S C B A Compressor |
| 88861 | Electrical / panel | Applied | App. Sep 2, 2021 | $100,000 | Installation Of New Multi-Horn Outdoor Siren |
| 88486 | Demolition | Applied | App. Jun 21, 2021 | $15,000 | Demo/Decomission Cell Site |