66 Great Circle Dr
Mill Valley 94941 · Strawberry · Unincorporated Marin · Coordinates: 37.87980, -122.50090
Executive Verdict · Public-Records Synthesis
Zoned RSP-5-BFC in Unincorporated Marin with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $2,241,000 ($1,972,000–$2,510,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-5-BFC supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 11,195 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$7,836 contributory est.)
Public building records show issued construction/renovation work on this parcel (4 total permits, latest Jul 21, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Strawberry
43 substantial renovation & housing permits over 24 months (28.4 per 1,000 parcels vs. 16.4 citywide baseline) (#1 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Strawberry)
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)
- ! Delayed or open permit activity on this parcel
Solar / battery storage (162511): Issued after 2 mo — slower than 90% of solar / battery storage permits in Unincorporated Marin (median 0d, 90th pct 2d, n=2,977).
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 7 Charles Van Damme Dock (0.49 mi S, 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)
- ! Year 1 Prop 13 tax reset (~$26,222/yr at $2,241,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,185/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:
- 11,195 sq ft (0.26 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 66 GREAT CIRCLE DR
Zoning & Land Use
RSP-5-BFC — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RSP-5-BFC (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RSP-5-BFC, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RSP-5-BFC, a single-family residential zone. The lot is 11,195 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
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0469F, 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: $1,972,000 – $2,510,000 · Status: Off market
HUD Small Area FMR (ZIP 94941) · FY 2026
Studio $2,730 · 1BR $3,270 · 2BR $3,960 · 3BR $5,060 · 4BR $5,240
Developments Deserving Closer Investigation & Active Area Builders
- Solar / battery storage (162511) (Issued)On this parcel
Issued after 2 mo — slower than 90% of solar / battery storage permits in Unincorporated Marin (median 0d, 90th pct 2d, n=2,977).
- New home at 7 Charles Van Damme Dock (Issued)0.49 mi S
Active in "Issued" for 9.3 yr (first record Aug 1, 2017) with no new permit activity recorded in 7.2 yr. High-impact scale (1 housing unit, 1 deed-restricted affordable, $110,000 declared valuation across 1 permit).
- New home (Entitled)0.15 mi N
In "Entitled" for 5.1 yr (since Sep 30, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Demolition at 171 Great Cir Dr (Applied)0.18 mi N
In "Applied" for 15 mo (since Aug 14, 2025), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
Entity-resolved builders & contractors in ½ mile: Solarcraft Services (1 on parcel, 1 in ½ mi · Solar / battery storage); Peter Levi Plumbing (1 on parcel, 1 in ½ mi · HVAC / heat pump); Gotelli Plumbing (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer); Ernest Ongaro And Sons (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer); Owner Builder (38 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B43169 | HVAC / heat pump | Issued | Iss. Jul 21, 2025 | $23,000 | Remove & replace furnace like for like. — Replace Mechanical Appliance |
| B35423 | Plumbing / water heater / sewer | Issued | Iss. Sep 15, 2023 | $1,300 | REPLACE GAS WATER HEATER WITH NEW 50 GALLON ELECTRIC WATER HEATER — Replace Plumbing Fixtures(s) |
| 162511 | Solar / battery storage | Issued | Iss. Sep 3, 2019 | $24,184 | Solar Pv 6.20kw |
| 146331 | Plumbing / water heater / sewer | Issued | Iss. Mar 23, 2015 | $2,500 | Repl Water Heater |