40 Fir Ave
San Geronimo 94963 · San Geronimo Village · Unincorporated Marin · Coordinates: 38.01414, -122.67498
Executive Verdict · Public-Records Synthesis
Zoned R1-B4-SGV in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,239,000 ($1,090,000–$1,388,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B4-SGV supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 128,415 sq ft lot. Local precedent is active with 1 ADU permit within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ 2 documented municipal building permits on file
On-parcel permit history is indexed through Mar 13, 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
- ! 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 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
HVAC / heat pump (173566): Issued after 2 mo — slower than 90% of hvac / heat pump permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,946).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 5 slow or stalled nearby projects within ½ mile
Closest lead: New home at 70 Juniper Ave (0.25 mi SW, 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:
- 128,415 sq ft (2.95 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 40 FIR AVE
Zoning & Land Use
R1-B4-SGV — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B4-SGV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B4-SGV, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B4-SGV, a single-family residential zone. The lot is 128,415 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.
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 X: minimal flood hazard (all 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: $1,090,000 – $1,388,000 · 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
- New home at 70 Juniper Ave (Applied)0.25 mi SW
In "Applied" for 4 yr (since Nov 18, 2022), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121). High-impact scale (1 housing unit, $930,000 declared valuation across 1 permit).
- HVAC / heat pump (173566) (Issued)On this parcel
Issued after 2 mo — slower than 90% of hvac / heat pump permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,946).
- New home at 15 Fir Ave (Applied)390 ft S
In "Applied" for 5 yr (since Nov 1, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Demolition at 15 Fir Ave (Issued)390 ft S
Active in "Issued" for 10.3 yr (first record Aug 3, 2016) with no new permit activity recorded in 10.2 yr.
Entity-resolved builders & contractors in ½ mile: Rhinosroofing (1 on parcel, 1 in ½ mi · Roof replacement); Owner Builder (8 in ½ mi · Demolition); Summit Professional Builders (2 in ½ mi · New garage / accessory structure); Bitzer (2 in ½ mi · Addition (adds square footage)); Owner (2 in ½ mi · Demolition).
Permit & Project History on This Parcel (2 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 173566 | HVAC / heat pump | Issued | Iss. Mar 13, 2023 | $79,000 | Remodel: Kitchen & Bath; [N] Subpanel; [N] Hvacs; [N] Wtr Htr & Propane Tank T.D. 3/13/23 |
| B31981 | Roof replacement | Issued | Iss. Dec 8, 2022 | $38,980 | Remove existing roof layer and install 30yr HDZ Timberline Shingles color: Barkwood gutters & downspouts — ReRoofing; Wi… |