359 Durant Way
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.87049, -122.53222
Executive Verdict · Public-Records Synthesis
Zoned RMP-2.5 in Unincorporated Marin with likely ministerial ADU eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $2,110,000 ($1,857,000–$2,363,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RMP-2.5 allows residential use qualifying for ministerial ADU review under state law (2 ADU permits permitted within ¼ mile in 36 months).
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ Documented permitted upgrades (+$50,224 contributory est.)
Public building records show issued construction/renovation work on this parcel (12 total permits, latest Oct 27, 2026).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Tamalpais
50 substantial renovation & housing permits over 24 months (20.5 per 1,000 parcels vs. 16.4 citywide baseline) (#3 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Tamalpais)
Watchouts & Due Diligence
- ! Mapped flood awareness zone (Zone X: minimal flood hazard)
all of the lot of the parcel intersects Zone X: minimal flood hazard. Outside mandatory federal SFHA insurance rules, but check local drainage and finished-floor requirements.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! CAL FIRE High Fire Hazard Severity Zone (State Responsibility Area) (all of the lot of lot)
Located in a mapped Fire Hazard Severity Zone. Expect Chapter 7A ignition-resistant building standards, defensible-space inspections, and stricter property insurance underwriting.
Source: CAL FIRE FHSZ (map Apr 1, 2024)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home at 535 Tennessee Valley Rd (adu 531) (0.36 mi E, issued). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
- ! Year 1 Prop 13 tax reset (~$24,715/yr at $2,110,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,060/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Parcel & Assessor
- Lot size:
- 5,706 sq ft (0.13 ac)
- Assessor use:
- Single Family Attached
- Addresses on lot:
- 359 DURANT WAY
Zoning & Land Use
RMP-2.5 — Residential Multiple Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RMP-2.5 (multifamily residential): state law allows ADUs where homes are allowed. On a multifamily lot the state allowance is different: ADUs in non-living space of the building, plus up to eight detached ADUs.
- SB 9: two homes on the lotUnlikely
Zoned RMP-2.5 (multifamily residential), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned RMP-2.5 (multifamily residential), not a single-family residential zone.
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 (all of the lot) · FIRM panel 06041C0510E, effective August 15, 2017
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,857,000 – $2,363,000 · 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)0.36 mi E
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).
- Accessory dwelling unit at 318 Via Recodo (Applied)320 ft S
In "Applied" for 7.4 yr (since Jun 25, 2019), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Accessory dwelling unit at 387 Countyview Dr (Applied)0.16 mi NW
In "Applied" for 5.2 yr (since Sep 3, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- New home (Entitled)0.17 mi NW
In "Entitled" for 5.6 yr (since Mar 31, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
Entity-resolved builders & contractors in ½ mile: Owner (1 on parcel, 13 in ½ mi · Remodel / interior alteration); Philip Kline Gen Cont (1 on parcel, 6 in ½ mi · Remodel / interior alteration); Structural Integrity (2 on parcel, 2 in ½ mi · Addition (adds square footage)); Northwest Exteriors (1 on parcel, 1 in ½ mi · Windows / doors / siding); Bolt Down The Bay Area (1 on parcel, 1 in ½ mi · New garage / accessory structure).
Permit & Project History on This Parcel (12 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 182828 | New garage / accessory structure | Issued | Iss. Oct 27, 2026 | $34,000 | New Exterior Staircase And Landings With Roof Cover |
| 94342 | Other | Applied | App. Jul 1, 2026 | $34,000 | New Outdoor Staircase. |
| B38988 | Plumbing / water heater / sewer | Issued | Iss. Aug 5, 2024 | $25,000 | Kitchen remodel - Like for like, no change to layout. Upgrade plumbing and electrical per code. |
| B35178 | Windows / doors / siding | Issued | Iss. Aug 24, 2023 | $38,367 | Replacing 1500 sq ft of siding at back & left. — Siding Replacement |
| 166240 | Solar / battery storage | Issued | Iss. Nov 12, 2020 |