135 Trinidad Dr
Tiburon 94920 · Paradise Cay · Unincorporated Marin · Coordinates: 37.91039, -122.47681
Executive Verdict · Public-Records Synthesis
Zoned RSP-5.8-BFC in Unincorporated Marin with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $3,250,000 ($2,860,000–$3,640,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-5.8-BFC supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 13,329 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$76,354 contributory est.)
Public building records show issued construction/renovation work on this parcel (4 total permits, latest May 16, 2023).
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 at 149 Jamaica St (0.12 mi N, 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 (~$37,825/yr at $3,250,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$3,152/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:
- 13,329 sq ft (0.31 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 135 TRINIDAD DR
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 lotLikely eligible
Zoned RSP-5.8-BFC, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RSP-5.8-BFC, a single-family residential zone. The lot is 13,329 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.
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 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: $2,860,000 – $3,640,000 · 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 149 Jamaica St (Issued)0.12 mi N
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)0.11 mi NE
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)0.12 mi SE
Active in "Issued" for 11.4 yr (first record Jun 2, 2015) with no new permit activity recorded in 11.1 yr.
- New home (Issued)0.22 mi W
Active in "Issued" for 4.6 yr (first record Mar 21, 2022) with no new permit activity recorded in 4.6 yr.
Entity-resolved builders & contractors in ½ mile: Lamperti Contracting And Design (1 on parcel, 4 in ½ mi · Remodel / interior alteration); Divine Electric (1 on parcel, 1 in ½ mi · EV charger); Pac Solar (1 on parcel, 1 in ½ mi · Solar / battery storage); Moore Services (1 on parcel, 1 in ½ mi · HVAC / heat pump); Owner Builder (15 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 174067 | Remodel / interior alteration | Issued | Iss. May 16, 2023 | $145,856 | Remodel: Kitchen, Living Rm, & Powder Rm; Flooring |
| B25222 | HVAC / heat pump | Issued | Iss. Mar 22, 2021 | $9,050 | NEW (CUT IN) 2.5 TON (14 SEER) A/C UNIT IN BACK YARD AND REPLACE 7 RUNS OF R6 DUCTING. — Replace Ductwork, Mechanical Ap… |
| B20137 | EV charger | Issued | Iss. Oct 16, 2019 | $23,000 | 125 amp main electrical service upgrade Replace sub panel to code compliant location in bedroom 30 amp EV circuit and Te… |
| 162796 | Solar / battery storage | Issued | Iss. Sep 30, 2019 | $17,000 | Pv 8.52 Kw- Express E- Inspection |