20206 Sapphire St
Castro Valley 94546 · Castro Valley · Unincorporated Alameda County · Coordinates: 37.69615, -122.05975
Parcel & Assessor
- Lot size:
- 5,596 sq ft (0.13 ac)
- Assessor use:
- 2 units, SFR with detached accessory dwelling unit
- Tax rate area:
- 54
- Addresses on lot:
- 20206 SAPPHIRE ST; 20206 SAPPHIRE ST UNIT A
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 06001C0285G, 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 —)
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)240 ft S
Active in "Issued" for 4.8 yr (first record Feb 2, 2022) with no new permit activity recorded in 4.7 yr.
- New home (Issued)0.11 mi N
Active in "Issued" for 4.1 yr (first record Oct 18, 2022) with no new permit activity recorded in 4.1 yr.
- New home (Issued)0.36 mi W
Active in "Issued" for 2.1 yr (first record Sep 27, 2024) with no new permit activity recorded in 2.1 yr.
- New home (Issued)0.41 mi NE
Active in "Issued" for 4.2 yr (first record Sep 1, 2022) with no new permit activity recorded in 4.2 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: 1 entry (report years 2023).