375 Highland Ave
San Rafael 94901 · Country Club · Unincorporated Marin · Coordinates: 37.98017, -122.50000
Executive Verdict · Public-Records Synthesis
Zoned R1-B4 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (local responsibility area) due diligence; benchmark value $1,741,000 ($1,532,000–$1,950,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B4 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 58,632 sq ft lot. Local precedent is active with 2 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$6,720 contributory est.)
Public building records show issued construction/renovation work on this parcel (6 total permits, latest Nov 11, 2025).
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 (Local 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 Mar 24, 2025)
- ! Delayed or open permit activity on this parcel
Windows / doors / siding (177200): Issued after 6 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,476).
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: Accessory dwelling unit at 41 Fairway Dr (adu 41a) (0.17 mi SW, 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:
- 58,632 sq ft (1.35 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 375 HIGHLAND AVE
Zoning & Land Use
R1-B4 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B4 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B4, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B4, a single-family residential zone. The lot is 58,632 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 (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0457E, effective March 16, 2016
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,532,000 – $1,950,000 · Status: Off market
HUD Small Area FMR (ZIP 94901) · FY 2026
Studio $2,150 · 1BR $2,580 · 2BR $3,120 · 3BR $3,990 · 4BR $4,130
Nearby Activity (½ mile radius, since November 2024)
3 active or recent development projects (3 housing units across completed, permitted, and pipeline stages) and 78 total building permits recorded within ½ mile.
- New construction1 permit
- Adds housing (ADU)3 permits (3 units)
- Additions & renovations9 permits
- Building systems47 permits
- Repairs5 permits
- Other13 permits
Developments Deserving Closer Investigation & Active Area Builders
- Windows / doors / siding (177200) (Issued)On this parcel
Issued after 6 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,476).
- Accessory dwelling unit at 41 Fairway Dr (adu 41a) (Issued)0.17 mi SW
Active in "Issued" for 23 mo (first record Dec 4, 2024) with no new permit activity recorded in 18 mo. High-impact scale (1 housing unit, $2,025,000 declared valuation across 1 permit).
- New home at 195 Fairway Dr (Issued)0.35 mi SW
Active in "Issued" for 5.6 yr (first record Mar 22, 2021) with no new permit activity recorded in 5.5 yr. High-impact scale (1 housing unit, $1,400,000 declared valuation across 1 permit).
- New home at 195 Fairway Dr (Issued)0.35 mi SW
Active in "Issued" for 12.9 yr (first record Dec 26, 2013) with no new permit activity recorded in 10.4 yr. High-impact scale (1 housing unit, $1,636,842 declared valuation across 2 permits).
Entity-resolved builders & contractors in ½ mile: Divine Electric (2 on parcel, 2 in ½ mi · Electrical / panel); Wb Saunders Construction (1 on parcel, 1 in ½ mi · Windows / doors / siding); Simply Solar (1 on parcel, 1 in ½ mi · Solar / battery storage); Weh General Builders (1 on parcel, 1 in ½ mi · Windows / doors / siding); Arb (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer).
Permit & Project History on This Parcel (6 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B44746 | Plumbing / water heater / sewer | Issued | Iss. Nov 11, 2025 | $3,500 | Extending houseline gas plumbing to facilitate meter move |
| B39865 | Windows / doors / siding | Issued | Iss. Oct 18, 2024 | $15,000 | siding repair 900 square feet for hardie planksiding and shear wall 1/2 cdx plywood house wrap paper — Siding Replacemen… |
| 177200 | Windows / doors / siding | Issued | Iss. Jul 26, 2024 | $21,975 | New Deck W/ Footings, Slab, Glass Rail. Replace Doors |
| 170420 | Solar / battery storage | Issued | Iss. Jan 19, 2022 | $16,644 | 4.56kw Rooftop Photovoltaic - Express |
| B28231 | EV charger | Issued | Iss. Jan 4, 2022 | $6,891 | 60A Tesla EV Charger Sub Panel Replacement — Service Upgrade, EV Charging Station |
| B26057 | Electrical / panel | Issued | Iss. Jun 15, 2021 | $9,577 | -Replace 16 foot power pole -Replace 125A main service with 200A main service, new riser, new grounding — Service Upgrad… |