23100 State Route 1
Marshall 94940 · Unincorporated Marin · Coordinates: 38.19992, -122.92007
Executive Verdict · Public-Records Synthesis
Zoned C-RMPC in Unincorporated Marin with likely ministerial ADU eligibility and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,537,000 ($1,306,000–$1,768,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone C-RMPC allows residential use qualifying for ministerial ADU review under state law.
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ 2 documented municipal building permits on file
On-parcel permit history is indexed through Nov 6, 2024, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
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)
- ! 1 slow or stalled nearby project within ½ mile
Closest lead: Demolition at 23115 State Route (0.11 mi SW, 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 (~$18,126/yr at $1,537,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,510/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:
- 173,979 sq ft (3.99 ac)
- Assessor use:
- Commercial - Improved
- Addresses on lot:
- 23100 STATE ROUTE 1; 23110 STATE ROUTE 1; 23240 STATE ROUTE 1
Zoning & Land Use
C-RMPC — Residential Commercial Multiple Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned C-RMPC (mixed use): 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 C-RMPC (mixed use), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned C-RMPC (mixed use), 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 06041C0085E, 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: $1,306,000 – $1,768,000 · 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
Nearby Activity (½ mile radius, since November 2024)
0 active or recent development projects and 4 total building permits recorded within ½ mile.
- New construction1 permit
Developments Deserving Closer Investigation & Active Area Builders
- Demolition at 23115 State Route (Issued)0.11 mi SW
Active in "Issued" for 2.7 yr (first record Mar 7, 2024) with no new permit activity recorded in 2.7 yr.
Entity-resolved builders & contractors in ½ mile: Owner Builder (1 on parcel, 1 in ½ mi · New garage / accessory structure); Capstone Roofing (1 on parcel, 1 in ½ mi · Roof replacement).
Permit & Project History on This Parcel (2 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 178030 | New garage / accessory structure | Issued | Iss. Nov 6, 2024 | $125,000 | Repair Boat Shack, Pier Structure, Decking, & Guardrails Due To Fire Damage - Nick's Cove |
| B16067 | Roof replacement | Issued | Iss. Oct 2, 2018 | $12,575 | reroof flat eating area. resheet — ReRoofing |