3175 Paradise Dr
Tiburon 94920 · Unincorporated Tiburon · Unincorporated Marin · Coordinates: 37.89004, -122.45104
Executive Verdict · Public-Records Synthesis
Zoned R1-B4 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 $3,373,000 ($2,968,000–$3,778,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B4 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 69,914 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$49,500 contributory est.)
Public building records show issued construction/renovation work on this parcel (9 total permits, latest May 5, 2025).
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)
- ! Delayed or open permit activity on this parcel
Addition (adds square footage) (79468): Pending in review for 9.9 yr (22.5× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
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: Accessory dwelling unit at 21 Teaberry Ln (0.11 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)
Parcel & Assessor
- Lot size:
- 69,914 sq ft (1.61 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 3175 PARADISE DR
Zoning & Land Use
R1-B4 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B4 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B4, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B4, a single-family residential zone. The lot is 69,914 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: $2,968,000 – $3,778,000 · 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
- Addition (adds square footage) (79468) (Applied)On this parcel
Pending in review for 9.9 yr (22.5× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
- Accessory dwelling unit at 21 Teaberry Ln (Applied)0.11 mi NW
In "Applied" for 4.5 yr (since May 5, 2022), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- New home (Entitled)0.48 mi SW
In "Entitled" for 7.2 yr (since Sep 5, 2019), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- New home (Issued)520 ft N
Active in "Issued" for 6.7 yr (first record Feb 20, 2020) with no new permit activity recorded in 6.7 yr.
Entity-resolved builders & contractors in ½ mile: Golden Gate Home Improvement (2 on parcel, 2 in ½ mi · Windows / doors / siding); Ohana Construction (2 on parcel, 2 in ½ mi · Remodel / interior alteration); Owner Builder (2 on parcel, 2 in ½ mi · General repair); A1 Solar Power (1 on parcel, 1 in ½ mi · Addition (adds square footage)); Donald T Larwood (1 on parcel, 1 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (9 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B42283 | Electrical / panel | Issued | Iss. May 5, 2025 | $4,500 | main meter panel upgrade. 125 amp upgrade to a 200 amp. — Service Upgrade |
| B30845 | Windows / doors / siding | Issued | Iss. Aug 25, 2022 | $197,413 | Replace existing 3500 sq ft T1-11 siding and trim with James Hardie siding and trim. Replace (7) windows and (1) door, s… |
| B26853 | Windows / doors / siding | Issued | Iss. Aug 31, 2021 | $47,627 | Replace (3) sliding doors, same size as existing. — Non-structural Door/Window Replacement |
| 156953 | General repair | Issued | Iss. Nov 2, 2017 | $20,000 | Retaining Wall #2***Expired |
| 156952 | General repair | Issued |