51 Juniper Ave
San Geronimo 94963 · San Geronimo Village · Unincorporated Marin · Coordinates: 38.01213, -122.67836
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 $1,380,000 ($1,214,000–$1,546,000).
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 57,499 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ 5 documented municipal building permits on file
On-parcel permit history is indexed through Apr 21, 2026, 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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home at 70 Juniper Ave (390 ft SE, 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)
- ! Year 1 Prop 13 tax reset (~$16,320/yr at $1,380,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,360/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:
- 57,499 sq ft (1.32 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 51 JUNIPER 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 57,499 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: $1,214,000 – $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
- New home at 70 Juniper Ave (Applied)390 ft SE
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).
- New home at 15 Fir Ave (Applied)0.19 mi E
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)0.19 mi E
Active in "Issued" for 10.3 yr (first record Aug 3, 2016) with no new permit activity recorded in 10.2 yr.
- Accessory dwelling unit at 500 Meadow Way (adu 500a) (Issued)0.3 mi NE
Active in "Issued" for 2 yr (first record Nov 6, 2024) with no new permit activity recorded in 21 mo.
Entity-resolved builders & contractors in ½ mile: Divine Electric (2 on parcel, 2 in ½ mi · Electrical / panel); Crandall Roofing (1 on parcel, 1 in ½ mi · Roof replacement); John Owens Services (1 on parcel, 1 in ½ mi · HVAC / heat pump); Renewal By Andersen (1 on parcel, 1 in ½ mi · Windows / doors / siding); Owner Builder (9 in ½ mi · Accessory dwelling unit (new or conversion)).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B46553 | HVAC / heat pump | Issued | Iss. Apr 21, 2026 | $22,500 | Replace Ductwork, Replace Mechanical Appliance |
| B45894 | Electrical / panel | Issued | Iss. Feb 17, 2026 | $5,200 | Service Upgrade |
| B45540 | Electrical / panel | Issued | Iss. Jan 16, 2026 | $4,900 | Replace 2 sub panels in the existing location — Service Upgrade |
| B30555 | Roof replacement | Issued | Iss. Jul 29, 2022 | $39,579 | T/O 16 SQ COMP SHINGLE; RE-ROOF WITH CLASS A RATED METAL ROOF SYSTEM; SFD — ReRoofing |
| 141217 | Windows / doors / siding | Issued | Iss. Jan 15, 2014 |