128 Castle Crest Rd
Alamo 94507 · Unincorporated Contra Costa · Coordinates: 37.87145, -122.05428
Parcel & Assessor
- Lot size:
- 33,977 sq ft (0.78 ac)
- Assessor use:
- Single Family, 1 residence on 1 site, with or without
- Tax rate area:
- 98006
- Addresses on lot:
- 128 CASTLE CREST RD
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 33,977 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 06013C0431F, 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: $2,399,000 – $3,245,000 · 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 —)
6 active or recent development projects (6 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- New home (Issued)210 ft NE
Active in "Issued" for 3.2 yr (first record Aug 1, 2023) with no new permit activity recorded in 3.2 yr.
- New home (Entitled)0.11 mi SW
Active in "Entitled" for 3.9 yr (first record Dec 16, 2022) with no new permit activity recorded in 3.9 yr.
- New home (Entitled)0.11 mi W
Active in "Entitled" for 20 mo (first record Feb 20, 2025) with no new permit activity recorded in 20 mo.
- New home (Issued)0.12 mi NW
Active in "Issued" for 3.9 yr (first record Dec 16, 2022) with no new permit activity recorded in 3.9 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).