21148 San Miguel Ave
Castro Valley 94546 · Castro Valley · Unincorporated Alameda County · Coordinates: 37.69165, -122.08092
Parcel & Assessor
- Lot size:
- 4,980 sq ft (0.11 ac)
- Assessor use:
- Single family residential homes used as such
- Tax rate area:
- 54
- Addresses on lot:
- 21148 SAN MIGUEL AVE; 21148 SAN MIGUEL AVE UNIT A; 21148 SAN MIGUEL AVE UNIT B
Zoning & Land Use
No published city zoning district at parcel centroid.
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADUCan't tell
We don't have a zoning map for Unincorporated Alameda County.
- SB 9: two homes on the lotCan't tell
We don't have a zoning map for Unincorporated Alameda County.
- SB 9: split into two lotsCan't tell
We don't have a zoning map for Unincorporated Alameda County.
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 06001C0279G, effective August 3, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $901,000 – $1,147,000 · Status: Off market
HUD Small Area FMR (ZIP 94546) · FY 2026
Studio $2,210 · 1BR $2,460 · 2BR $3,000 · 3BR $3,840 · 4BR $4,550
Developments Deserving Closer Investigation & Active Area Builders
- New home (Issued)On this parcel
Active in "Issued" for 2.1 yr (first record Sep 18, 2024) with no new permit activity recorded in 2.1 yr.
- New home (Issued)On this parcel
Active in "Issued" for 2.1 yr (first record Sep 18, 2024) with no new permit activity recorded in 2.1 yr.
- Boulevard Commons building g (Issued)0.3 mi N
Active in "Issued" for 3 yr (first record Nov 9, 2023) with no new permit activity recorded in 3 yr. High-impact scale (11 housing units across 0 permits).
- Boulevard Commons building f (Issued)0.3 mi N
Active in "Issued" for 3 yr (first record Nov 9, 2023) with no new permit activity recorded in 3 yr. High-impact scale (9 housing units across 0 permits).
Permit & Project History on This Parcel (0 permits, 2 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 2025).