104 Jamaica St
Tiburon 94920 · Paradise Cay · Unincorporated Marin · Coordinates: 37.90974, -122.47434
Executive Verdict · Public-Records Synthesis
Zoned RSP-5.8-BFC in Unincorporated Marin with likely ministerial ADU eligibility and mapped FEMA AE flood due diligence; benchmark value $3,357,000 ($2,954,000–$3,760,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RSP-5.8-BFC allows residential use qualifying for ministerial ADU review under state law.
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ Documented permitted upgrades (+$87,050 contributory est.)
Public building records show issued construction/renovation work on this parcel (5 total permits, latest Feb 15, 2024).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
Watchouts & Due Diligence
- ! FEMA Special Flood Hazard Area (AE, about 68% of the lot of lot)
Zone AE: 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)
- ! Delayed or open permit activity on this parcel
Windows / doors / siding (151107): Issued after 8 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,477).
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 149 Jamaica St (0.19 mi NW, 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 (~$39,056/yr at $3,357,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$3,255/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:
- 19,950 sq ft (0.46 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 104 JAMAICA ST
Zoning & Land Use
RSP-5.8-BFC — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RSP-5.8-BFC (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotPossible, with conditions
Zoned RSP-5.8-BFC, a single-family residential zone. FEMA Special Flood Hazard Area (Zone AE) covers about 68% of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
- SB 9: split into two lotsPossible, with conditions
Zoned RSP-5.8-BFC, a single-family residential zone. The lot is 19,950 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original. FEMA Special Flood Hazard Area (Zone AE) covers about 68% of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
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 AE: 1% annual chance flood (Special Flood Hazard Area) (about 68% of the lot); Zone X: 0.2% annual chance flood hazard (shaded X) (about 32% of the lot) · FIRM panel 06041C0486E, 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: $2,954,000 – $3,760,000 · 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
- Windows / doors / siding (151107) (Issued)On this parcel
Issued after 8 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,477).
- New home at 149 Jamaica St (Issued)0.19 mi NW
Active in "Issued" for 12.2 yr (first record Aug 19, 2014) with no new permit activity recorded in 12 yr. High-impact scale (1 housing unit, $750,000 declared valuation across 1 permit).
- New home (Entitled)0.15 mi NW
In "Entitled" for 5.1 yr (since Oct 7, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- New home at 100 Jamaica St (Issued)110 ft W
Active in "Issued" for 11.4 yr (first record Jun 2, 2015) with no new permit activity recorded in 11.1 yr.
Entity-resolved builders & contractors in ½ mile: Daniel Gallagher Constr (2 on parcel, 2 in ½ mi · Addition (adds square footage)); Peter Levi Plumbing (2 on parcel, 2 in ½ mi · HVAC / heat pump); Headlands Construction (1 on parcel, 1 in ½ mi · Remodel / interior alteration); Owner Builder (16 in ½ mi · Remodel / interior alteration); Owner (10 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B37026 | Plumbing / water heater / sewer | Issued | Iss. Feb 15, 2024 | $6,000 | remove and replace water heater located in the garage with a 75 gallon NG WH — Replace Plumbing Fixtures(s) |
| 169333 | Remodel / interior alteration | Issued | Iss. Sep 14, 2021 | $70,000 | Interior Remodel - Kitchen |
| B20680 | HVAC / heat pump | Issued | Iss. Dec 30, 2019 | $7,100 | Change out Furnace Connecting to Existing Ducting — Replace Mechanical Appliance |
| 151788 | Addition (adds square footage) | Issued | Iss. Apr 16, 2016 | $125,000 | Addn; Conv To Liv Sp |
| 151107 | Windows / doors / siding | Issued | Iss. Mar 9, 2016 |