3630 Paradise Dr
Tiburon 94920 · Unincorporated Tiburon · Unincorporated Marin · Coordinates: 37.89419, -122.46200
Executive Verdict · Public-Records Synthesis
Zoned RSP-1-BFC in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $3,324,000 ($2,925,000–$3,723,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-1-BFC supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 33,541 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ 5 documented municipal building permits on file
On-parcel permit history is indexed through Mar 11, 2025, 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
- ! 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)
- ! CAL FIRE Moderate Fire Hazard Severity Zone (State 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 Apr 1, 2024)
- ! 5 slow or stalled nearby projects within ½ mile
Closest lead: New home at 3820 Paradise Dr (0.47 mi NW, applied). 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 (~$38,676/yr at $3,324,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$3,223/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:
- 33,541 sq ft (0.77 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 3630 PARADISE DR
Zoning & Land Use
RSP-1-BFC — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RSP-1-BFC (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RSP-1-BFC, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RSP-1-BFC, a single-family residential zone. The lot is 33,541 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
- Moderate Fire Hazard Severity Zone (State Responsibility Area) (all of the lot, map Apr 1, 2024)
- 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: $2,925,000 – $3,723,000 · 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 3820 Paradise Dr (Applied)0.47 mi NW
In "Applied" for 5.4 yr (since Jun 23, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121). High-impact scale (1 housing unit, $3,800,000 declared valuation across 1 permit).
- Accessory dwelling unit at 3820 Paradise Dr Lot (Issued)0.41 mi NW
Active in "Issued" for 2.3 yr (first record Aug 8, 2024) with no new permit activity recorded in 16 mo. High-impact scale (1 housing unit, $1,900,000 declared valuation across 1 permit).
- New home at 3880 Paradise Dr (Issued)0.46 mi NW
Active in "Issued" for 12.7 yr (first record Feb 13, 2014) with no new permit activity recorded in 11.4 yr. High-impact scale (1 housing unit, $2,240,000 declared valuation across 2 permits).
- New home (Issued)0.33 mi SW
Active in "Issued" for 2 yr (first record Nov 11, 2024) with no new permit activity recorded in 2 yr.
Entity-resolved builders & contractors in ½ mile: Ernest Ongaro And Sons (2 on parcel, 2 in ½ mi · HVAC / heat pump); Fritz Bldg (1 on parcel, 1 in ½ mi · HVAC / heat pump); Schalich Brothers Construction (1 on parcel, 1 in ½ mi · Remodel / interior alteration); Creative Roofing Of N CA (1 on parcel, 1 in ½ mi · Roof replacement); Zamgen Construction (4 in ½ mi · New garage / accessory structure).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B41559 | Plumbing / water heater / sewer | Issued | Iss. Mar 11, 2025 | $3,000 | Replace tanked water heater with new tankless water heater. Run dedicated 3/4 galv gas line from gas meter to tankless l… |
| B41488 | HVAC / heat pump | Issued | Iss. Mar 5, 2025 | $12,600 | Replace failed furnace and 9 runs of failed ducting with new furnace and ducting - ducting located in crawlspace — Repla… |
| 147910 | Remodel / interior alteration | Issued | Iss. Jul 8, 2015 | $45,000 | Rmdl To 2 Bas & Pantry (Per Dana), Stairs, Skylight, Railings To Other Decks T.D. 5/25/15 |
| 144913 | Roof replacement | Issued | Iss. Nov 13, 2014 | $22,215 | Reroof |
| 142446 | HVAC / heat pump |