91 Perth Way
Inverness 94937 · Inverness · Unincorporated Marin · Coordinates: 38.09681, -122.86143
Executive Verdict · Public-Records Synthesis
Zoned C-RSP-1 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 $1,770,000 ($1,558,000–$1,982,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned C-RSP-1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 53,666 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
- ✓ 4 documented municipal building permits on file
On-parcel permit history is indexed through Sep 27, 2018, 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 60 Trossach Way (380 ft NW, 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 (~$20,805/yr at $1,770,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,734/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:
- 53,666 sq ft (1.23 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 91 PERTH WAY
Zoning & Land Use
C-RSP-1 — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned C-RSP-1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned C-RSP-1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned C-RSP-1, a single-family residential zone. The lot is 53,666 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 06041C0230E, effective August 15, 2017
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,558,000 – $1,982,000 · Status: Off market
HUD Small Area FMR (ZIP 94937) · FY 2026
Studio $2,400 · 1BR $2,870 · 2BR $3,480 · 3BR $4,450 · 4BR $4,610
Developments Deserving Closer Investigation & Active Area Builders
- New home at 60 Trossach Way (Applied)380 ft NW
In "Applied" for 5.9 yr (since Dec 15, 2020), 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, $1,400,000 declared valuation across 1 permit).
- New home at 182 Laurel Ave (Issued)210 ft S
Active in "Issued" for 12.9 yr (first record Dec 31, 2013) with no new permit activity recorded in 11.9 yr.
- New home at 179 Keith Way (Issued)0.49 mi N
Active in "Issued" for 17 mo (first record Jun 9, 2025) with no new permit activity recorded in 10 mo. High-impact scale (1 housing unit, $1,160,000 declared valuation across 1 permit).
- Accessory dwelling unit at 125 Forres Way (Issued)0.14 mi NE
Active in "Issued" for 20 mo (first record Mar 14, 2025) with no new permit activity recorded in 19 mo.
Entity-resolved builders & contractors in ½ mile: Owner (3 on parcel, 5 in ½ mi · Addition (adds square footage)); Moore Services (1 on parcel, 1 in ½ mi · HVAC / heat pump); Stryker Builders (4 in ½ mi · New garage / accessory structure); Owner Builder (4 in ½ mi · Remodel / interior alteration); Oakwood Construction (2 in ½ mi · New garage / accessory structure).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B16038 | HVAC / heat pump | Issued | Iss. Sep 27, 2018 | $4,250 | FURNACE & DUCT REPLACEMENT ONLY AFUE 80 — Replace Ductwork, Replace Mechanical Appliance |
| B15825 | Windows / doors / siding | Issued | Iss. Aug 30, 2018 | $15,000 | Replace all windows in house with Milgard Tuscan Series Windows. There will be Single Hung windows, Picture Windows and … |
| B15759 | Electrical / panel | Issued | Iss. Aug 27, 2018 | $500 | Update any electrical outlets through out house if needed by a licensed electrician that will be checking each one. — Re… |
| B15745 | Other | Issued | Iss. Aug 20, 2018 | $10,000 | install gas-burning heating stove — Mechanical Appliance |