221 Tiburon Blvd
San Rafael 94901 · California Park · Unincorporated Marin · Coordinates: 37.95432, -122.51188
Parcel & Assessor
- Lot size:
- 20,996 sq ft (0.48 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 221 TIBURON BLVD
Zoning & Land Use
R1-B3 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B3 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B3, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B3, a single-family residential zone. The lot is 20,996 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 06041C0459F, 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: $1,308,000 – $1,664,000 · Status: Off market
HUD Small Area FMR (ZIP 94901) · FY 2026
Studio $2,150 · 1BR $2,580 · 2BR $3,120 · 3BR $3,990 · 4BR $4,130
Developments Deserving Closer Investigation & Active Area Builders
- 79 new homes at 0 Auburn St & Woodland Ave (Applied)0.31 mi N
Active in "Applied" for 22 mo (first record Dec 18, 2024) with no new permit activity recorded in 14 mo. High-impact scale (79 housing units, 16 deed-restricted affordable across 16 permits).
- Demolition at 40 Bret Harte Rd (Issued)270 ft S
Active in "Issued" for 10.6 yr (first record Apr 5, 2016) with no new permit activity recorded in 10.5 yr.
- Accessory dwelling unit at 22 Bret Harte Rd (Issued)500 ft SE
Active in "Issued" for 3.9 yr (first record Nov 18, 2022) with no new permit activity recorded in 3.4 yr.
- Accessory dwelling unit at 230 Tiburon Blvd A K A (Issued)500 ft NW
Active in "Issued" for 8.6 yr (first record Mar 7, 2018) with no new permit activity recorded in 7.8 yr.
Permit & Project History on This Parcel (2 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 94429 | Accessory dwelling unit (new or conversion) | Applied | App. Aug 3, 2026 | $75,000 | Convert Garage Into Two Level A D U With Addition. Expand A D U Deck, New Deck At Main House |
| B45925 | Other | Issued | Iss. Feb 18, 2026 | $6,575 | — |