Alameda County property record for 20447 John Dr, Castro Valley, CA 94546 · Last verified October 2025
| Property Type | Quadplex |
|---|---|
| Details | 8 bd · 4 ba · 3,328 sqft · built 1962 |
| Lot Size | 0.129 acres (5,628 sqft) |
| Owner | Individual Name on File |
| Last Sale | $635,000 (Feb 2010) |
| Tax Bill | $12,267 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 84A-265-1-17 |
| Primary APN | 84A-265-1-17 |
|---|---|
| Alternative APN |
|
| Bedrooms | 8 Beds |
|---|---|
| Full Baths | 4 Baths |
| Total Rooms | 16 Rooms |
| Units | 4 Units |
| Stories | 2 Stories |
| Building Area | 3,328 sqft Total Area |
| Year Built | Built 1962 |
|---|---|
| Architectural Style | Other |
| Construction Type | Wood |
| Lot Area | 5,628 sqft (0.129 acres) |
| Street Address | 20447 JOHN DR |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-3950 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Quadplex |
| Legal Description | SUBD:STANTON TR#:1 |
| Legal Subdivision | STANTON |
| Legal Tract | 1 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 3 |
| Census Block | 3013 |
| Census Tract | 430500 |
Source: Alameda County records · APN 84A-265-1-17
Assessment roll updated July 1, 2025 · Last verified October 2025
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on File |
|---|---|
| Co-owner | Verified Secondary Owner |
| Mailing Address | 2900 ADAMS ST, ALAMEDA, CA 94501-5404 |
| Owner Type | Individual |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Feb 19, 2010 · Amount on Record |
| Deed Sale | Feb 19, 2010 · Amount on Record |
| Prior Sale | Jul 31, 1998 · Amount on Record |
| Deed Document Number | 2010045833 |
| Record Updated | Jun 08, 2026 |
Source: Alameda County records · Assessment roll updated July 1, 2025 · Last verified October 2025
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2025 | $12,267.00 (+4.21%) | $819,613 (+4.04%) Land $245,884 Building $573,729 |
| 2023 | $11,771.00 | $787,793 Land $236,338 Building $551,455 |
Source: FEMA National Flood Hazard Layer, Alameda County (06001C), updated May 25, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Special Flood Hazard Area | No |
| Flood Hazard | Minimal |
| 500-Year Floodplain | No |
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach |
Values are read at the parcel center point; lenders make the official flood determination.
Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 262 locations within about half a mile of this property
| Provider | Technology | Download / Upload (Mbps) |
|---|---|---|
| AT&T | Fiber | 5,000 / 5,000 |
| Xfinity | Cable | 2,000 / 250 |
| Verizon | Fixed Wireless | 300 / 20 |
| Starlink | Satellite (low-earth orbit) | 280 / 30 |
May also be available at this address: Sonic Telecom, T-Mobile USA, AT&T, Unwired, Etheric Communications, LLC., California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.
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