Alameda County property record for 17643 Whisper Ln, Castro Valley, CA 94546
| Property Type | Planned Unit Development |
|---|---|
| Details | 4 bd · 3 ba · 3,038 sqft · built 2020 |
| Lot Size | 0.17 acres (7,428 sqft) |
| Owner | Individual Name on File |
| Last Sale | $1,428,000 (Aug 2020) |
| Tax Bill | $19,023 (2025) |
| Deeds & Mortgages | Aug 2020 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 84D-1403-22 |
| Primary APN | 84D-1403-22 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 6 Rooms |
| Stories | 2 Stories |
| Building Area | 3,038 sqft Living Area |
| Year Built | Built 2020 |
|---|---|
| Construction Type | Wood |
| Lot Area | 7,428 sqft (0.17 acres) |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 17643 WHISPER LN |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-4671 |
| Property Category | Residential |
| Property Type | Residential > Condominium / Townhouse > Planned Unit Development |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 3 |
| Census Block | 3003 |
| Census Tract | 430300 |
17643 Whisper Ln, a planned unit development, is owned and occupied by an individual who bought it in August 2020.
Source: Alameda County records, as of October 20, 2025
| Owner of Record | Individual Name on File |
|---|---|
| Co-owner | Co-owner on File |
| Mailing Address | 17643 WHISPER LN, CASTRO VALLEY, CA 94546-4671 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 | 2 Names on Deed |
|---|---|
| Last Sale | Aug 25, 2020 · Amount on File |
| Deed Sale | Aug 25, 2020 · Amount on File |
| Deed Document Number | 2020208657 |
| Record Updated | Jun 8, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Aug 25, 2020 |
| Property Address | 17643 WHISPER LN, CASTRO VALLEY, CA 94546-4671 |
| Document Number | 0000208657 |
| Map Reference | MB 355 PG 4-8 |
| Instrument Date | May 14, 2019 |
| Instrument | 2020208657 |
| Transaction Type | Transfer |
| Record Updated | Aug 19, 2021 |
| Title Company | OLD REPUBLIC TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 17643 WHISPER LN, CASTRO VALLEY, CA 94546-4671 |
| Document Number | 0000208658 |
|---|---|
| Date | Aug 25, 2020 |
| Instrument | 2020208658 |
| Name | AMERICAN PACIFIC MORTGAGE |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Sep 1, 2050 |
The 2025 property tax bill for 17643 Whisper Ln was $19,023 with a homeowner's exemption.
Source: Alameda County assessment roll, as of July 1, 2025
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2025 | $19,023.00 Homeowner's exemption | $1,545,478 Land $463,275 Building $1,082,203 |
| 2023 | $18,346.00 Homeowner's exemption | $1,485,482 Land $445,291 Building $1,040,191 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 17643 Whisper Ln in Zone X, an area of minimal flood risk.
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 |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 1 in force |
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.
Wildfire risk around 17643 Whisper Ln is moderate, ranking above 46% of the US, with a 0.1% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 46% of the US · lower than 72% of California |
|---|---|
| Wildfire Likelihood | 0.1% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 666 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 · DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: Etheric Networks, T-Mobile, Unwired.
5G (outdoors only) and 4G LTE
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