610 San Geronimo Valley Dr
San Geronimo 94963 · San Geronimo Village · Unincorporated Marin · Coordinates: 38.01380, -122.66714
Executive Verdict · Public-Records Synthesis
Zoned R1-B2-SGV in Unincorporated Marin with likely ministerial ADU eligibility and mapped FEMA A flood / CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,380,000 ($1,214,000–$1,546,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone R1-B2-SGV allows residential use qualifying for ministerial ADU review under state law (3 ADU permits permitted within ¼ mile in 36 months).
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ 8 documented municipal building permits on file
On-parcel permit history is indexed through Mar 3, 2023, 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
- ! FEMA Special Flood Hazard Area (A, about 70% of the lot of lot)
Zone A: 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 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)
- ! Delayed or open permit activity on this parcel
Demolition at 625 San Geronimo Valley Dr: Active in "Issued" for 4.9 yr (first record Dec 6, 2021) with no new permit activity recorded in 3.9 yr.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 2 slow or stalled nearby projects within ½ mile
Closest lead: New home at 15 Fir Ave (0.44 mi W, applied). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
Parcel & Assessor
- Lot size:
- 54,755 sq ft (1.26 ac)
- Assessor use:
- Commercial - Improved
- Addresses on lot:
- 610 SAN GERONIMO VALLEY DR; 615 SAN GERONIMO VALLEY DR; 620 SAN GERONIMO VALLEY DR
Zoning & Land Use
R1-B2-SGV — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B2-SGV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotPossible, with conditions
Zoned R1-B2-SGV, a single-family residential zone. FEMA Special Flood Hazard Area (Zone A) covers about 70% 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 R1-B2-SGV, a single-family residential zone. The lot is 54,755 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original. FEMA Special Flood Hazard Area (Zone A) covers about 70% 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
- High Fire Hazard Severity Zone (State Responsibility Area) (all of the lot, map Apr 1, 2024)
- FEMA National Flood Hazard Layer
- Zone A: 1% annual chance flood (Special Flood Hazard Area) (about 70% of the lot); Zone X: minimal flood hazard (about 30% of the lot) · FIRM panel 06041C0275D, 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: $1,214,000 – $1,546,000 · Status: Off market
HUD Small Area FMR (ZIP 94963) · FY 2026
Studio $2,500 · 1BR $3,000 · 2BR $3,630 · 3BR $4,630 · 4BR $4,800
Developments Deserving Closer Investigation & Active Area Builders
- Demolition at 625 San Geronimo Valley Dr (Issued)On this parcel
Active in "Issued" for 4.9 yr (first record Dec 6, 2021) with no new permit activity recorded in 3.9 yr.
- HVAC / heat pump (173502) (Issued)On this parcel
Issued after 5 mo — slower than 90% of hvac / heat pump permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,946).
- Demolition (172904) (Issued)On this parcel
Issued after 12 mo (6.7× the 55d median) — slower than 90% of demolition permits in Unincorporated Marin (median 55d, 90th pct 261d, n=130).
- Demolition (172903) (Issued)On this parcel
Issued after 12 mo (6.7× the 55d median) — slower than 90% of demolition permits in Unincorporated Marin (median 55d, 90th pct 261d, n=130).
Entity-resolved builders & contractors in ½ mile: Owner Builder (6 on parcel, 10 in ½ mi · Demolition); Quality Of Light (2 on parcel, 2 in ½ mi · Electrical / panel); Bitzer (2 in ½ mi · Addition (adds square footage)); Dolan Construction (1 in ½ mi · New garage / accessory structure); Leff Const And Dev (1 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (8 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 173502 | HVAC / heat pump | Issued | Iss. Mar 3, 2023 | $75,000 | Minor Electrical, Plumbing, & Mechanical Work In Kitchen |
| B32687 | Electrical / panel | Issued | Iss. Feb 22, 2023 | $10,000 | Replacing existing 600 amp service with 400 amp service feeding two 200 amp meters. One meter to service San Geronimo Va… |
| 172904 | Demolition | Issued | Iss. Dec 8, 2022 | $5,500 | Demo Bldg #2 B W O P |
| 172903 | Demolition | Issued | Iss. Dec 8, 2022 | $5,500 | Demo Bldg #1 |