Alameda County property record for 15951 Windsor Dr, Castro Valley, CA 94578 · Last verified August 2026
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 5 ba · 2,009 sqft · built 1947 |
| Lot Size | 0.157 acres (6,831 sqft) |
| Owner | Company Name on File |
| Tax Bill | $5,550 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 80A-163-11 |
| Primary APN | 80A-163-11 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 5 Baths |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 2,009 sqft Living Area |
| Year Built | Built 1947 |
|---|---|
| Effective Year Built | Effective 1947 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 6,831 sqft (0.157 acres) |
| Street Address | 15951 WINDSOR DR |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94578-1415 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00011 BLK: 000F TR: 0813 |
| Legal Tract | 0813 |
| Legal Block | F |
| Legal Lot Number | 11 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 1 |
| Census Block | 1004 |
| Census Tract | 430500 |
Source: Alameda County records · APN 80A-163-11
Assessment roll updated August 5, 2026 · Last verified August 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 1862 27TH AVE, SAN FRANCISCO, CA 94122-4212 |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Transfer Date | Jan 02, 2000 |
| Transfer Doc | 0000022891 |
| Record Updated | Sep 20, 2026 |
Source: Alameda County records · Assessment roll updated August 5, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | San Lorenzo Unified School District (KG - 12) |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $400,136 (+2%) Land $120,133 Building $280,003 | ||
| 2025 | $5,550.00 (+3.87%) | $392,291 (+4.04%) Land $117,777 Building $274,514 | |
| 2023 | $5,343.00 | $377,059 Land $113,204 Building $263,855 | $887,310 |
Source: FEMA National Flood Hazard Layer, Alameda County (06001C), updated May 25, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060014305001, refreshed September 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 |
| Nearby Flood Claims | 2 (1978) |
| Most Recent Claim | Jan 1978, tidal / storm surge |
| 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; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 522 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 |
May also be available at this address: Verizon, Unwired, Etheric Communications, LLC., AT&T, T-Mobile USA. Availability varies by address; speeds are provider-advertised maximums, not measured.
5G and 4G LTE
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