2393 Mar East St
Tiburon 94920 · Unincorporated Tiburon · Unincorporated Marin · Coordinates: 37.87711, -122.44430
Executive Verdict · Public-Records Synthesis
Zoned R2 in Unincorporated Marin with likely ministerial ADU eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $2,889,000 ($2,542,000–$3,236,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone R2 allows residential use qualifying for ministerial ADU review under state law (2 ADU permits permitted within ¼ mile in 36 months).
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ Documented permitted upgrades (+$20,877 contributory est.)
Public building records show issued construction/renovation work on this parcel (5 total permits, latest Jun 4, 2021).
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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home (0.45 mi W, entitled). 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 (~$33,674/yr at $2,889,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,806/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:
- 3,703 sq ft (0.09 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 2393 MAR EAST ST
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
- 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 06041C0489E, 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: $2,542,000 – $3,236,000 · Status: Off market
HUD Small Area FMR (ZIP 94920) · FY 2026
Studio $2,820 · 1BR $3,380 · 2BR $4,100 · 3BR $5,230 · 4BR $5,420
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)0.45 mi W
In "Entitled" for 2.3 yr (since Aug 13, 2024), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- New home (Entitled)0.45 mi W
In "Entitled" for 2.3 yr (since Aug 13, 2024), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Accessory dwelling unit at 2398 Vista Del Mar Ln (was 2401 Paradise Dr) (Issued)440 ft W
Active in "Issued" for 6 yr (first record Nov 16, 2020) with no new permit activity recorded in 5.6 yr.
- New home (Issued)460 ft W
Active in "Issued" for 2 yr (first record Oct 28, 2024) with no new permit activity recorded in 2 yr.
Entity-resolved builders & contractors in ½ mile: Northern Pacific Power (2 on parcel, 2 in ½ mi · Solar / battery storage); All Seasons Roofing And Waterproofing (1 on parcel, 1 in ½ mi · Roof replacement); Hassler Heating And Air (1 on parcel, 1 in ½ mi · HVAC / heat pump); Charles Window And Door (1 on parcel, 1 in ½ mi · Windows / doors / siding); Owner Builder (8 in ½ mi · Accessory dwelling unit (new or conversion)).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 168359 | Solar / battery storage | Issued | Iss. Jun 4, 2021 | $45,409 | Energy Storage System - Express |
| 167070 | Solar / battery storage | Issued | Iss. Feb 4, 2021 | $17,993 | 4.76kw Rooftop Photovoltaic |
| 149020 | HVAC / heat pump | Issued | Iss. Sep 17, 2015 | $9,000 | Repl Furnace & Ducting |
| 148060 | Windows / doors / siding | Issued | Iss. Jul 20, 2015 | $6,000 | Replace 2 Windows |
| 147356 | Roof replacement | Issued | Iss. Jun 2, 2015 | $20,970 | Reroof |