10 Sonoma Patio
Stinson Beach 94970 · Stinson Beach · Unincorporated Marin · Coordinates: 37.90305, -122.65260
Executive Verdict · Public-Records Synthesis
Zoned C-RSP-2 in Unincorporated Marin and mapped FEMA VE flood / CAL FIRE very high fire hazard severity zone (local responsibility area) due diligence; benchmark value $3,258,000 ($2,867,000–$3,649,000).
Upsides & Opportunities
- ✓ Documented permitted upgrades (+$83,300 contributory est.)
Public building records show issued construction/renovation work on this parcel (6 total permits, latest Aug 6, 2019).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
Watchouts & Due Diligence
- ! FEMA Special Flood Hazard Area (VE, about 84% of the lot of lot)
Zone VE: 1% annual chance flood (Special Flood Hazard Area) overlaps this parcel. Expect mandatory flood insurance for federally backed loans and floodplain elevation/mitigation rules for new units or SB 9 applications.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! CAL FIRE Very High Fire Hazard Severity Zone (Local 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 Mar 24, 2025)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home at 4 Sacramento Patio (adu 4a) (280 ft 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 (~$37,917/yr at $3,258,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$3,160/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:
- 15,551 sq ft (0.36 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 10 SONOMA PATIO
Zoning & Land Use
C-RSP-2 — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADUPossible, with conditions
Zoned C-RSP-2 (single-family residential): state law allows ADUs where homes are allowed. Very High Fire Hazard Severity Zone covers all of the lot: cities may limit ADUs here for fire safety and evacuation.
- SB 9: two homes on the lotPossible, with conditions
Zoned C-RSP-2, a single-family residential zone. Very High Fire Hazard Severity Zone (local responsibility area) covers all of the lot: SB 9 requires the project to meet the fire hazard mitigation standards. FEMA Special Flood Hazard Area (Zone VE) covers about 84% of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
- SB 9: split into two lotsPossible, with conditions
Zoned C-RSP-2, a single-family residential zone. The lot is 15,551 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original. Very High Fire Hazard Severity Zone (local responsibility area) covers all of the lot: SB 9 requires the project to meet the fire hazard mitigation standards. FEMA Special Flood Hazard Area (Zone VE) covers about 84% of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Very High Fire Hazard Severity Zone (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone VE: 1% annual chance flood (Special Flood Hazard Area) (about 84% of the lot); Zone X: 0.2% annual chance flood hazard (shaded X) (about 16% of the lot) · FIRM panel 06041C0444E, effective August 15, 2017
Surrounding Rent & Value Benchmarks (Public Records)
Range: $2,867,000 – $3,649,000 · Status: Off market
HUD Small Area FMR (ZIP 94970) · FY 2026
Studio $2,090 · 1BR $2,510 · 2BR $3,030 · 3BR $3,870 · 4BR $4,010
Developments Deserving Closer Investigation & Active Area Builders
- New home at 4 Sacramento Patio (adu 4a) (Issued)280 ft E
Active in "Issued" for 2.6 yr (first record Apr 24, 2024) with no new permit activity recorded in 2.3 yr. High-impact scale (1 housing unit, $1,800,000 declared valuation across 1 permit).
- New home at 7 Jose Patio (Issued)0.16 mi SE
Active in "Issued" for 3.5 yr (first record May 16, 2023) with no new permit activity recorded in 2.4 yr. High-impact scale (1 housing unit, $1,750,000 declared valuation across 1 permit).
- New home at 150 Seadrift Rd (Issued)0.3 mi W
Active in "Issued" for 10.2 yr (first record Sep 6, 2016) with no new permit activity recorded in 9.9 yr. High-impact scale (1 housing unit, $1,750,000 declared valuation across 1 permit).
- New home at 73 Dipsea Rd (Issued)0.44 mi NW
Active in "Issued" for 8 yr (first record Nov 13, 2018) with no new permit activity recorded in 7.8 yr. High-impact scale (1 housing unit, $925,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: Sun First (3 on parcel, 3 in ½ mi · Solar / battery storage); Rosenbach Constr (2 on parcel, 2 in ½ mi · Remodel / interior alteration); Marin County Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Gubbins Building (11 in ½ mi · Remodel / interior alteration); Owner Builder (6 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (6 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 162251 | Remodel / interior alteration | Issued | Iss. Aug 6, 2019 | $75,000 | Rmdl 2 Baths & A 1/2 Bath T.D. |
| 162153 | Electrical / panel | Issued | Iss. Jul 24, 2019 | $1,500 | New Sub Panel |
| 162018 | Solar / battery storage | Issued | Iss. Jul 10, 2019 | $25,000 | Battey Backup |
| 162017 | Solar / battery storage | Issued | Iss. Jul 10, 2019 | $25,000 | Rooftop Solar 8.64 K W - Express |
| B18080 | Roof replacement | Issued | Iss. Jun 24, 2019 | $65,000 | T/O existing modified bitumen membrane and replace with same modified bitumen membrane Class A assembly. No new sheathin… |