4 Warrens Way
Tiburon 94920 · Tiburon · Coordinates: 37.90042, -122.49175
Parcel & Assessor
- Lot size:
- 18,513 sq ft (0.42 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 4 WARRENS WAY
Zoning & Land Use
RO-2 — Residential Open (20,000 square feet) (Tiburon)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RO-2 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned RO-2, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned RO-2, a single-family residential zone. The lot is 18,513 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 06041C0488E, 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: $3,155,000 – $4,269,000 · 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
Nearby Activity (½ mile radius, since October 2024)
8 active or recent development projects (8 housing units across completed, permitted, and pipeline stages) and 11 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)On this parcel
Active in "Entitled" for 6.9 yr (first record Dec 10, 2019) with no new permit activity recorded in 6.9 yr.
- New home (Issued)0.17 mi E
Active in "Issued" for 18 mo (first record Apr 22, 2025) with no new permit activity recorded in 18 mo.
- New home (Issued)0.22 mi E
Active in "Issued" for 2.7 yr (first record Jan 30, 2024) with no new permit activity recorded in 2.7 yr.
- New home (Issued)0.23 mi NE
Active in "Issued" for 19 mo (first record Apr 2, 2025) with no new permit activity recorded in 19 mo.
Permit & Project History on This Parcel (0 permits, 1 grouped projects)
No building permits recorded on this parcel in our dataset.
State HCD Housing Element APR records on this parcel: 1 entry (report years 2019).