280 Trinidad Dr
Tiburon 94920 · Paradise Cay · Unincorporated Marin · Coordinates: 37.91583, -122.47832
Executive Verdict · Public-Records Synthesis
Zoned RMP-1.35-BFC in Unincorporated Marin with likely ministerial ADU eligibility and mapped FEMA AE flood due diligence; benchmark value $3,113,000 ($2,739,000–$3,487,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RMP-1.35-BFC allows residential use qualifying for ministerial ADU review under state law.
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ 3 documented municipal building permits on file
On-parcel permit history is indexed through Jun 26, 2018, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
Watchouts & Due Diligence
- ! FEMA Special Flood Hazard Area (AE, about 7% 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
New home at 280 Trinidad Dr - Lot: Active in "Issued" for 11.5 yr (first record May 20, 2015) with no new permit activity recorded in 10.6 yr.
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 4970 Ranch Rd (0.26 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 (~$36,250/yr at $3,113,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$3,021/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:
- 10,324 sq ft (0.24 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 280 TRINIDAD DR
Zoning & Land Use
RMP-1.35-BFC — Residential Multiple Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RMP-1.35-BFC (multifamily residential): state law allows ADUs where homes are allowed. On a multifamily lot the state allowance is different: ADUs in non-living space of the building, plus up to eight detached ADUs.
- SB 9: two homes on the lotUnlikely
Zoned RMP-1.35-BFC (multifamily residential), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned RMP-1.35-BFC (multifamily residential), not a single-family residential zone.
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 7% of the lot); Zone X: minimal flood hazard (about 36% of the lot); Zone X: 0.2% annual chance flood hazard (shaded X) (about 56% 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: $2,739,000 – $3,487,000 · 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 at 280 Trinidad Dr - Lot (Issued)On this parcel
Active in "Issued" for 11.5 yr (first record May 20, 2015) with no new permit activity recorded in 10.6 yr.
- Plumbing / water heater / sewer (158900) (Issued)On this parcel
Issued after 11 mo — slower than 90% of plumbing / water heater / sewer permits in Unincorporated Marin (median 0d, 90th pct 0d, n=2,211).
- New home at 4970 Ranch Rd (Issued)0.26 mi NW
Active in "Issued" for 11.4 yr (first record Jun 2, 2015) with no new permit activity recorded in 11.2 yr. High-impact scale (1 housing unit, $1,200,000 declared valuation across 1 permit).
- New home at 149 Jamaica St (Issued)0.28 mi SE
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).
Entity-resolved builders & contractors in ½ mile: Owner (2 on parcel, 14 in ½ mi · Remodel / interior alteration); Davidson Builders (1 on parcel, 9 in ½ mi · New single-family home); Owner Builder (16 in ½ mi · Remodel / interior alteration); Lamperti Contracting And Design (4 in ½ mi · Remodel / interior alteration); Singlepoint Design Build (2 in ½ mi · Addition (adds square footage)).
Permit & Project History on This Parcel (3 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 158900 | Plumbing / water heater / sewer | Issued | Iss. Jun 26, 2018 | $10,000 | Elec & Plumb For Hot Tub |
| B13128 | Electrical / panel | Issued | Iss. Aug 23, 2017 | $2,890 | Add electrical outlet & low voltage lighting in back yard — New Circuits / Outlets |
| 151470 | New single-family home | Issued | Iss. Apr 6, 2016 | $332,600 | S F D***Expired |