360 Jean St
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.87874, -122.53264
Executive Verdict · Public-Records Synthesis
Zoned R2 in Unincorporated Marin with likely ministerial ADU eligibility and mapped FEMA AH flood / CAL FIRE moderate fire hazard severity zone (local responsibility area) due diligence; benchmark value $2,163,000 ($1,903,000–$2,423,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone R2 allows residential use qualifying for ministerial ADU review under state law (8 ADU permits permitted within ¼ mile in 36 months).
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ Documented permitted upgrades (+$37,135 contributory est.)
Public building records show issued construction/renovation work on this parcel (12 total permits, latest Oct 1, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Tamalpais
50 substantial renovation & housing permits over 24 months (20.5 per 1,000 parcels vs. 16.4 citywide baseline) (#3 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Tamalpais)
Watchouts & Due Diligence
- ! FEMA Special Flood Hazard Area (AH, about 43% of the lot of lot)
Zone AH: 1% annual chance flood (Special Flood Hazard Area) overlaps this parcel. Expect mandatory flood insurance for federally backed loans and floodplain elevation/mitigation rules for new units or SB 9 applications.
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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: Accessory dwelling unit at 403 Marin Ave (adu 403a) (0.18 mi W, 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 (~$25,325/yr at $2,163,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,110/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:
- 8,494 sq ft (0.19 ac)
- Assessor use:
- Multiple-Resid. - Improved
- Addresses on lot:
- 360 JEAN ST; 360 JEAN ST APT 1; 360 JEAN ST APT 2
Zoning & Land Use
R2 — Residential Two Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R2 (two-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotCan't tell
Zoned R2 (two-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential Two Family.
- SB 9: split into two lotsCan't tell
Zoned R2 (two-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential Two Family.
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 AH: 1% annual chance flood (Special Flood Hazard Area) (about 43% of the lot); Zone X: minimal flood hazard (about 57% of the lot) · FIRM panel 06041C0468F, 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: $1,903,000 – $2,423,000 · 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 403 Marin Ave (adu 403a) (Issued)0.18 mi W
Active in "Issued" for 2.9 yr (first record Dec 21, 2023) with no new permit activity recorded in 19 mo. High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- New home at 469 W Live Oak Dr (aka 461) (Issued)0.43 mi SW
Active in "Issued" for 6.1 yr (first record Oct 22, 2020) with no new permit activity recorded in 22 mo. High-impact scale (1 housing unit, $980,000 declared valuation across 1 permit).
- New home at 731 Bay Rd (Issued)0.44 mi W
Active in "Issued" for 18 mo (first record May 12, 2025) with no new permit activity recorded in 15 mo. High-impact scale (1 housing unit, $955,000 declared valuation across 1 permit).
- New home at 217 Cleveland Ave (Issued)0.5 mi NE
Active in "Issued" for 9.7 yr (first record Feb 21, 2017) with no new permit activity recorded in 2.3 yr. High-impact scale (1 housing unit, $875,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: Hsc Services (2 on parcel, 3 in ½ mi · Remodel / interior alteration); Aaero Heating And Sheet Metal (2 on parcel, 2 in ½ mi · HVAC / heat pump); Eric Cannedy (1 on parcel, 1 in ½ mi · Electrical / panel); Owner Builder (93 in ½ mi · Remodel / interior alteration); Owner (50 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (12 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B44152 | Electrical / panel | Issued | Iss. Oct 1, 2025 | $15,000 | remove old service, provide new service with breakers and bonding — Service Upgrade |
| B16411 | HVAC / heat pump | Issued | Iss. Nov 7, 2018 | $1,963 | Replace Wall Furnace. Install one Williams Wall Furnace Model#W2509822 complete with all final connections. — Replace Me… |
| 156589 | Remodel / interior alteration | Issued | Iss. Sep 25, 2017 | $8,187 | Deck Repairs; Railings; Interior Ceiling Repair Per Deck Joists T.D. 9/5/17 |
| 156588 | Remodel / interior alteration | Issued | Iss. Sep 25, 2017 | $8,187 | Deck Repairs; Railings; Interior Ceiling Repair Per Deck Joists T.D. 9/5/17 |
| 156587 | Remodel / interior alteration |