18400 State Route 1
Marshall 94940 · East Shore · Unincorporated Marin · Coordinates: 38.14325, -122.87055
Executive Verdict · Public-Records Synthesis
Zoned C-APZ-60 in Unincorporated Marin and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,592,000 ($1,401,000–$1,783,000).
Upsides & Opportunities
- ✓ Documented permitted upgrades (+$15,840 contributory est.)
Public building records show issued construction/renovation work on this parcel (2 total permits, latest Jul 15, 2026).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
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 Moderate 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)
- ! Year 1 Prop 13 tax reset (~$18,758/yr at $1,592,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,563/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:
- 2,522,037 sq ft (57.90 ac)
- Assessor use:
- Farmland - Imprv
- Addresses on lot:
- 18400 STATE ROUTE 1
Zoning & Land Use
C-APZ-60 — Agriculture Production Zone (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADUCan't tell
Zoned C-APZ-60 (agricultural): ADUs are allowed if the zone allows a home, which depends on the zone's rules.
- SB 9: two homes on the lotUnlikely
Zoned C-APZ-60 (agricultural), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned C-APZ-60 (agricultural), not a single-family residential zone.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Moderate 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 06041C0115E, 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: $1,401,000 – $1,783,000 · Status: Off market
HUD Small Area FMR (ZIP 94940) · FY 2026
Studio $2,050 · 1BR $2,510 · 2BR $2,990 · 3BR $3,870 · 4BR $4,090
Developments Deserving Closer Investigation & Active Area Builders
Entity-resolved builders & contractors in ½ mile: Solarcraft Services (1 on parcel, 1 in ½ mi · Solar / battery storage); Reyff Electric (1 on parcel, 1 in ½ mi · EV charger); Owner Builder (1 in ½ mi · Addition (adds square footage)).
Permit & Project History on This Parcel (2 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B47503 | EV charger | Issued | Iss. Jul 15, 2026 | $2,296 | EV Charging Station; With Electronic Inspection |
| B33939 | Solar / battery storage | Issued | Iss. May 18, 2023 | $53,900 | (N) FLUSH MOUNTED 13.60 kW PV SYSTEM W/ GRID TIED MICROINVERTERS |