Alameda County property record for 20821 Chester St, Castro Valley, CA 94546
| Property Type | Commercial |
|---|---|
| Details | 2,240 sqft · built 1950 |
| Lot Size | 0.126 acres (5,508 sqft) |
| Owner | Company Name on File |
| Last Sale | $870,000 (Dec 2024) |
| Tax Bill | $14,394 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 84A-37-3-1 |
| Primary APN | 84A-37-3-1 |
|---|---|
| Alternative APN |
|
| Stories | 1 Story |
|---|---|
| Building Area | 2,240 sqft Total Area |
| Year Built | Built 1950 |
|---|---|
| Effective Year Built | Effective 1950 |
| Architectural Style | L-Shape |
| Exterior Material | Stucco |
| Construction Type | Wood |
| Fire Resistance | Wood or Wood & Steel Frame |
| Roof Type | Gable |
| Roof Material | Composition Shingle |
| Lot Area | 5,508 sqft (0.126 acres) |
| Lot Dimensions | 108 ft deep x 51 ft wide |
| Heating System | HVAC |
|---|
| Street Address | 20821 CHESTER ST |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-5551 |
| Property Category | Commercial |
| Property Type | Commercial > Retail |
| Legal Description | LOT: 00001 BLK: 0003 AR: 084A PAGE: 0037 |
| Legal Subdivision | LAUREL FARM |
| Legal Lot Number | 28 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 2 |
| Census Block | 2000 |
| Census Tract | 431000 |
20821 Chester St, a commercial property, is owned by a company that bought it in December 2024.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 20821 CHESTER ST, CASTRO VALLEY, CA 94546-5551 |
| Owner Type | Company |
| Vesting | Limited Liability Partnership |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Dec 2, 2024 · Amount on File |
| Deed Sale | Dec 2, 2024 · Amount on File |
| Deed Document Number | 2024146834 |
| Prior Transfer Date | Nov 4, 2014 |
| Prior Transfer Doc | 0000274000 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 20821 Chester St was $14,394, up 52.7% from the year before.
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $887,400 (+2%) Land $224,400 Building $663,000 | |
| 2025 | $14,394.00 (+52.72%) | $870,000 Land $220,000 Building $650,000 |
| 2024 | $9,425.00 (+3.29%) | |
| 2023 | $9,125.00 | $457,987 Land $195,396 Building $262,591 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 20821 Chester St in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 2023.
Source: FEMA National Flood Hazard Layer, effective May 25, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 10 policies |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 10 in force |
| Nearby Flood Claims | 2 (2023–2025) |
| Most Recent Claim | Dec 2025 · rainfall accumulation |
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.
The area around 20821 Chester St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Dec 2021 |
| Lead | Under 1 ppb (2022–2024) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 499 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: GeoLinks, Unwired.
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