420 Calle Del Mar
Stinson Beach 94970 · Stinson Beach · Unincorporated Marin · Coordinates: 37.90159, -122.64197
Executive Verdict · Public-Records Synthesis
Zoned C-R1-B3 in Unincorporated Marin and mapped CAL FIRE very high fire hazard severity zone (state responsibility area) due diligence; benchmark value $3,254,000 ($2,864,000–$3,644,000).
Upsides & Opportunities
- ✓ Documented permitted upgrades (+$7,920 contributory est.)
Public building records show issued construction/renovation work on this parcel (2 total permits, latest Jun 3, 2023).
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 Very 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: Accessory dwelling unit at 260 Belvedere Ave (0.12 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 (~$37,871/yr at $3,254,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$3,156/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:
- 20,996 sq ft (0.48 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 420 CALLE DEL MAR
Zoning & Land Use
C-R1-B3 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADUPossible, with conditions
Zoned C-R1-B3 (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-R1-B3, a single-family residential zone. Very High Fire Hazard Severity Zone (State responsibility area) covers all of the lot: SB 9 requires the project to meet the fire hazard mitigation standards.
- SB 9: split into two lotsPossible, with conditions
Zoned C-R1-B3, a single-family residential zone. The lot is 20,996 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 (State responsibility area) covers all of the lot: SB 9 requires the project to meet the fire hazard mitigation standards.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Very 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 06041C0444E, 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: $2,864,000 – $3,644,000 · 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
- Accessory dwelling unit at 260 Belvedere Ave (Issued)0.12 mi E
Active in "Issued" for 4.9 yr (first record Dec 16, 2021) with no new permit activity recorded in 22 mo. High-impact scale (1 housing unit, $2,000,000 declared valuation across 1 permit).
- New home at 25 Lincoln Ave (Issued)0.15 mi SE
Active in "Issued" for 7.3 yr (first record Jul 22, 2019) with no new permit activity recorded in 7.1 yr. High-impact scale (1 housing unit, $969,000 declared valuation across 1 permit).
- Mixed-use development at 3466 State Route 1 & (Issued)0.26 mi SE
Active in "Issued" for 6.1 yr (first record Sep 23, 2020) with no new permit activity recorded in 5.1 yr. High-impact scale (1 housing unit, $1,000,000 declared valuation across 2 permits).
- New home at 7 Jose Patio (Issued)0.44 mi W
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).
Entity-resolved builders & contractors in ½ mile: Greenlief Energy (1 on parcel, 1 in ½ mi · Solar / battery storage); Morris Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Owner Builder (17 in ½ mi · Commercial tenant improvement); Owner (9 in ½ mi · New garage / accessory structure); Gubbins Building (4 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 |
|---|---|---|---|---|---|
| B34151 | Solar / battery storage | Issued | Iss. Jun 3, 2023 | $20,000 | 7.66kw roof top photovoltaic system 21 rec 365w solar panels 200 amp underground main panel changeout like for like |
| B13394 | Roof replacement | Issued | Iss. Sep 28, 2017 | $11,675 | Tear-off & re-roof main house — ReRoofing; With Electronic Inspection |