Alameda County property record for 21852 Ada St, Hayward, CA 94546
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 905 sqft · built 1948 |
| Lot Size | 0.116 acres (5,040 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $845,000 (Feb 2022) |
| Tax Bill | $11,558 (2025) |
| Deeds & Mortgages | Feb 2022 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 415-90-90 |
| Primary APN | 415-90-90 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 4 Rooms |
| Stories | 1 Story |
| Building Area | 905 sqft Living Area |
| Year Built | Built 1948 |
|---|---|
| Effective Year Built | Effective 1948 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 5,040 sqft (0.116 acres) |
| Street Address | 21852 ADA ST |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-6304 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00009 BLK: 0001 TR: 0871 |
| Legal Subdivision | E SHOWN ON THE MAP OF TRACT 871 |
| Legal Tract | 0871 |
| Legal Block | 1 |
| Legal Lot Number | 9 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 1 |
| Census Block | 1003 |
| Census Tract | 431200 |
Source: Alameda County records, as of August 5, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on Record |
|---|---|
| Mailing Address | 21852 ADA ST, CASTRO VALLEY, CA 94546-6304 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Feb 3, 2022 · Amount on Record |
| Deed Sale | Feb 3, 2022 · Amount on Record |
| Prior Sale | Aug 21, 2007 · Amount on Record |
| Deed Document Number | 202223641 |
| Prior Transfer Date | Aug 11, 2012 |
| Prior Transfer Doc | 0000263397 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Feb 3, 2022 |
| Property Address | 21852 ADA ST, HAYWARD, CA 94546-6304 |
| Document Number | 0000023641 |
| Map Reference | MB 27 PG 68 |
| Instrument Date | Jan 21, 2022 |
| Instrument | 2022023641 |
| Transaction Type | Transfer |
| Record Updated | Feb 23, 2022 |
| Title Company | NOT AVAILABLE, DOMA TITLE OF CALIFORNIA INC |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $929.50 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 21852 ADA ST, CASTRO VALLEY, CA 94546-6304 |
| Document Number | 0000023642 |
|---|---|
| Date | Feb 3, 2022 |
| Instrument | 2022023642 |
| Name | GUARANTEED RATE INC |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Feb 1, 2052 |
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Hayward Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $907,644 (+1.22%) Land $274,393 Building $640,251 | ||
| 2025 | $11,558.00 (+4.32%) Homeowner's exemption | $896,713 (+4.04%) Land $269,014 Building $627,699 | |
| 2023 | $11,079.00 Homeowner's exemption | $861,900 Land $258,570 Building $603,330 | $757,170 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on Record median of 15 policies |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 15 in force |
| Nearby Flood Claims | 1 (1996) |
| Most Recent Claim | Dec 1996 · 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.
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 732 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| 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, Sonic Telecom, Unwired.
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