55 Corwin Dr
Alamo 94507 · Unincorporated Contra Costa · Coordinates: 37.83725, -122.02816
Parcel & Assessor
- Lot size:
- 23,087 sq ft (0.53 ac)
- Assessor use:
- Single Family, 1 residence on 1 site, with or without
- Tax rate area:
- 66009
- Addresses on lot:
- 55 CORWIN DR
Zoning & Land Use
R-20 — Single Family Residential (Unincorporated Contra Costa)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R-20 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R-20, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R-20, a single-family residential zone. The lot is 23,087 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
- High Fire Hazard Severity Zone (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06013C0434F, effective June 16, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $2,384,000 – $3,226,000 · Status: Off market
HUD Small Area FMR (ZIP 94507) · FY 2026
Studio $2,610 · 1BR $2,910 · 2BR $3,550 · 3BR $4,540 · 4BR $5,380
Nearby Activity (½ mile radius, since —)
14 active or recent development projects (16 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- Ball Estates (Entitled)0.22 mi S
Active in "Entitled" for 7.2 yr (first record Aug 14, 2019) with no new permit activity recorded in 7.2 yr. High-impact scale (35 housing units across 0 permits).
- New home (Entitled)0.1 mi NW
Active in "Entitled" for 6.1 yr (first record Oct 9, 2020) with no new permit activity recorded in 6.1 yr.
- New home (Issued)0.1 mi NE
Active in "Issued" for 5.6 yr (first record Mar 11, 2021) with no new permit activity recorded in 5.6 yr.
- New home (Entitled)0.1 mi NE
Active in "Entitled" for 6.2 yr (first record Aug 17, 2020) with no new permit activity recorded in 6.2 yr.
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: 2 entries (report years 2024, 2025).