50 Buena Vista Ave
Fairfax 94930 · Unincorporated Fairfax · Unincorporated Marin · Coordinates: 37.97346, -122.61336
Executive Verdict · Public-Records Synthesis
Zoned R1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,311,000 ($1,154,000–$1,468,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 10,542 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
- ✓ 9 documented municipal building permits on file
On-parcel permit history is indexed through Nov 18, 2025, 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)
- ! Delayed or open permit activity on this parcel
Other (180344): Issued after 2 mo — above the 75th percentile for other permits in Unincorporated Marin (median 0d, 75th pct 1d, n=1,562).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 4 slow or stalled nearby projects within ½ mile
Closest lead: Demolition at 2 Mora Ave (330 ft W, 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)
Parcel & Assessor
- Lot size:
- 10,542 sq ft (0.24 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 50 BUENA VISTA AVE
Zoning & Land Use
R1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1, a single-family residential zone. The lot is 10,542 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
- 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 06041C0451E, effective March 17, 2014
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,154,000 – $1,468,000 · Status: Off market
HUD Small Area FMR (ZIP 94930) · FY 2026
Studio $2,230 · 1BR $2,680 · 2BR $3,240 · 3BR $4,140 · 4BR $4,290
Developments Deserving Closer Investigation & Active Area Builders
- Other (180344) (Issued)On this parcel
Issued after 2 mo — above the 75th percentile for other permits in Unincorporated Marin (median 0d, 75th pct 1d, n=1,562).
- Demolition at 2 Mora Ave (Issued)330 ft W
Active in "Issued" for 4.6 yr (first record Apr 26, 2022) with no new permit activity recorded in 4.5 yr.
- New home (Issued)0.34 mi NE
Active in "Issued" for 6.3 yr (first record Jul 16, 2020) with no new permit activity recorded in 6.3 yr.
- New home at 740 Bolinas Rd (Issued)0.36 mi E
Active in "Issued" for 2.6 yr (first record Apr 12, 2024) with no new permit activity recorded in 2.6 yr.
Entity-resolved builders & contractors in ½ mile: Moore Services (2 on parcel, 2 in ½ mi · HVAC / heat pump); New Cap Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Renewal By Andersen (1 on parcel, 1 in ½ mi · Windows / doors / siding); Moore Home Services (1 on parcel, 1 in ½ mi · HVAC / heat pump); Moore Heating Air And Solar (1 on parcel, 1 in ½ mi · HVAC / heat pump).
Permit & Project History on This Parcel (9 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B44818 | HVAC / heat pump | Issued | Iss. Nov 18, 2025 | $11,777 | FURNACE CHANGE OUT 40K BTU, 97 AFUE IN BASEMENT — Replace Mechanical Appliance |
| 180344 | Other | Issued | Iss. Oct 22, 2025 | $10,000 | Removal Of Deck, Install Fence And Deck Railing |
| B25976 | Windows / doors / siding | Issued | Iss. Jun 8, 2021 | $5,527 | Replacing 2 retrofit windows. — Non-structural Door/Window Replacement |
| B24818 | HVAC / heat pump | Issued | Iss. Feb 5, 2021 | $6,050 | NEW (CUT IN) 4 TON (14 SEER) AC ON RIGHT SIDE YARD AND INSTALL 6 RUNS OF R6 DUCTING — New Ductwork, Mechanical Appliance |
| B20177 | Roof replacement | Issued |