39 Lomita Dr
Mill Valley 94941 · Alto · Unincorporated Marin · Coordinates: 37.90720, -122.51863
Executive Verdict · Public-Records Synthesis
Zoned RA-B2 in Unincorporated Marin with likely ministerial ADU eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $2,255,000 ($1,984,000–$2,526,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RA-B2 allows residential use qualifying for ministerial ADU review under state law (9 ADU permits permitted within ¼ mile in 36 months).
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ Documented permitted upgrades (+$8,640 contributory est.)
Public building records show issued construction/renovation work on this parcel (3 total permits, latest Sep 18, 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)
- ! Delayed or open permit activity on this parcel
Accessory dwelling unit at 39 Lomita Dr: In "Applied" for 2.7 yr (since Mar 4, 2024), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
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: New home at 55 Thomas Dr (0.37 mi E, 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 (~$26,383/yr at $2,255,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,199/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:
- 17,206 sq ft (0.39 ac)
- Assessor use:
- Multiple-Resid. - Improved
- Addresses on lot:
- 39 LOMITA DR
Zoning & Land Use
RA-B2 — Residential Agriculture (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RA-B2 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotCan't tell
Zoned RA-B2 (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
- SB 9: split into two lotsCan't tell
Zoned RA-B2 (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
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 06041C0467F, 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: $1,984,000 – $2,526,000 · 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
- Accessory dwelling unit at 39 Lomita Dr (Applied)On this parcel
In "Applied" for 2.7 yr (since Mar 4, 2024), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- New home at 55 Thomas Dr (Applied)0.37 mi E
In "Applied" for 6.2 yr (since Sep 1, 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, $1,000,000 declared valuation across 1 permit).
- Accessory dwelling unit (new or conversion) (91965) (Applied)On this parcel
Pending in review for 2.7 yr (4.8× the 204d median) — slower than 90% of accessory dwelling unit (new or conversion) permits in Unincorporated Marin (median 204d, 90th pct 549d, n=298).
- New home at 30 Shell Rd (Issued)280 ft S
Active in "Issued" for 2.4 yr (first record Jul 5, 2024) with no new permit activity recorded in 22 mo. High-impact scale (1 housing unit, $2,800,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: Sunrun Installation Services (1 on parcel, 1 in ½ mi · Solar / battery storage); Green Hill Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Owner Builder (33 in ½ mi · Remodel / interior alteration); Owner (19 in ½ mi · Remodel / interior alteration); Drosihn Construction (5 in ½ mi · New single-family home).
Permit & Project History on This Parcel (3 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B43936 | Roof replacement | Issued | Iss. Sep 18, 2025 | $16,700 | Tear off and replacement comp shingle partial reroof (garages area only) 2 roof planes 28 sqs like for like — ReRoofing |
| B43853 | Solar / battery storage | Issued | Iss. Sep 12, 2025 | $20,000 | PV INSTALL 4.5KW, 11 MODULES, 1 ESS, MPR |
| 91965 | Accessory dwelling unit (new or conversion) | Applied | App. Mar 4, 2024 | $150,000 | Construct (N) A D U Above (E) Garage; Seismic Work To Strengthen Garage |