3600 Tomales Petaluma Rd
Tomales 94971 · Unincorporated Marin · Coordinates: 38.25251, -122.88284
Executive Verdict · Public-Records Synthesis
Zoned A60 in Unincorporated Marin and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,153,000 ($980,000–$1,326,000).
Upsides & Opportunities
- ✓ Documented permitted upgrades (+$59,904 contributory est.)
Public building records show issued construction/renovation work on this parcel (11 total permits, latest Oct 30, 2025).
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)
about 84% 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)
- ! Delayed or open permit activity on this parcel
Solar / battery storage (175785): Issued after 7 mo — slower than 90% of solar / battery storage permits in Unincorporated Marin (median 0d, 90th pct 2d, n=2,977).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! Year 1 Prop 13 tax reset (~$13,710/yr at $1,153,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,142/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:
- 6,830,164 sq ft (156.80 ac)
- Assessor use:
- Exemption - Improved
- Addresses on lot:
- 3600 TOMALES PETALUMA RD
Zoning & Land Use
A60 — Agriculture and Conservation (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADUCan't tell
Zoned A60 (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 A60 (agricultural), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned A60 (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 (about 84% of the lot); Zone X: minimal flood hazard (about 16% of the lot) · FIRM panel 06041C0045D, effective May 4, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $980,000 – $1,326,000 · Status: Off market
HUD Small Area FMR (ZIP 94971) · FY 2026
Studio $2,400 · 1BR $2,870 · 2BR $3,480 · 3BR $4,450 · 4BR $4,610
Nearby Activity (½ mile radius, since November 2024)
0 active or recent development projects and 2 total building permits recorded within ½ mile.
- Building systems2 permits
Developments Deserving Closer Investigation & Active Area Builders
- Solar / battery storage (175785) (Issued)On this parcel
Issued after 7 mo — slower than 90% of solar / battery storage permits in Unincorporated Marin (median 0d, 90th pct 2d, n=2,977).
- Plumbing / water heater / sewer (170127) (Issued)On this parcel
Issued after 5 mo — slower than 90% of plumbing / water heater / sewer permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,211).
Entity-resolved builders & contractors in ½ mile: Charles Davidson Electric (4 on parcel, 4 in ½ mi · Solar / battery storage); Sutter Roofing (2 on parcel, 2 in ½ mi · Roof replacement); Sutter Roofing And Sheet Metal (2 on parcel, 2 in ½ mi · Roof replacement); North Bay Solar Electric (1 on parcel, 1 in ½ mi · Solar / battery storage); It Admin (1 on parcel, 1 in ½ mi · Electrical / panel).
Permit & Project History on This Parcel (11 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B44597 | Roof replacement | Issued | Iss. Oct 30, 2025 | $20,000 | 3600 Tomales Petaluma Rd, Tomales, CA 94971 - Remove existing asphalt shingles and install new asphalt shingles - This p… |
| B44314 | Roof replacement | Issued | Iss. Oct 10, 2025 | $25,000 | Remove existing asphalt shingles and install ne asphalt shingles - Class A installation - (Main house) I will attach a m… |
| 175785 | Solar / battery storage | Issued | Iss. Jan 19, 2024 | $65,000 | 9.8 Kw Groundmount Photovoltaic With Energy Storage System & Generator |
| B35915 | Electrical / panel | Issued | Iss. Nov 3, 2023 | $40,000 | Rewiring and new outlets in building, new fixtures, new breaker panel. — New Circuits / Outlets, Replace Circuits / Outl… |
| B31614 |