21623 Baywood Ave
Castro Valley 94546 · Castro Valley · Unincorporated Alameda County · Coordinates: 37.68663, -122.08153
Parcel & Assessor
- Lot size:
- 10,978 sq ft (0.25 ac)
- Assessor use:
- 2 units, SFR with detached accessory dwelling unit
- Tax rate area:
- 59
- Addresses on lot:
- 21623 BAYWOOD AVE; 21623 BAYWOOD AVE UNIT A; 21623 BAYWOOD 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 AE: 1% annual chance flood (Special Flood Hazard Area) (about 35% of the lot); Zone X: 0.2% annual chance flood hazard (shaded X) (about 65% of the lot) · FIRM panel 06001C0287G, 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: $1,116,000 – $1,420,000 · 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
Nearby Activity (½ mile radius, since —)
5 active or recent development projects (5 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)On this parcel
Active in "Issued" for 2.8 yr (first record Jan 8, 2024) with no new permit activity recorded in 2.8 yr.
- 5 new homes (Entitled)0.48 mi W
Active in "Entitled" for 3.1 yr (first record Sep 28, 2023) with no new permit activity recorded in 3.1 yr. High-impact scale (5 housing units across 0 permits).
- New home (Entitled)160 ft SE
Active in "Entitled" for 3.2 yr (first record Sep 7, 2023) with no new permit activity recorded in 3.2 yr.
- New home (Issued)520 ft E
Active in "Issued" for 4.3 yr (first record Jul 20, 2022) with no new permit activity recorded in 4.3 yr.
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 2023, 2025).