Alameda County property record for 16817 Hallmark Ct, Castro Valley, CA 94552
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 3 ba · 2,830 sqft · built 1987 |
| Lot Size | 0.487 acres (21,200 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $1,600,000 (Oct 2024) |
| Tax Bill | $19,749 (2025) |
| Deeds & Mortgages | Jan 2019 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 85-6314-56 |
| Primary APN | 85-6314-56 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,830 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1987 |
|---|---|
| Effective Year Built | Effective 1987 |
| Architectural Style | L-Shape |
| Exterior Material | Wood |
| Construction Type | Wood |
| Roof Material | Tile |
| Lot Area | 21,200 sqft (0.487 acres) |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Forced Air with A/C |
|---|---|
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 16817 HALLMARK CT |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94552-1632 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | LOT: 00056 BLK: TR: 5055 |
| Legal Subdivision | TRACT 5055 FILED MARCH 28 1985 |
| Legal Tract | 5055 |
| Legal Lot Number | 56 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 1 |
| Census Block | 1001 |
| Census Tract | 430200 |
16817 Hallmark Ct is owned and occupied by two individuals who bought it in October 2024.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 16817 HALLMARK CT, CASTRO VALLEY, CA 94552-1632 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
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 | Oct 11, 2024 · Amount on File |
| Deed Sale | Oct 11, 2024 · Amount on File |
| Prior Sale | Apr 24, 2014 · Amount on File |
| Deed Document Number | 2024124376 |
| Prior Transfer Date | Aug 31, 2012 |
| Prior Transfer Doc | 0000323115 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Property Address | 16817 HALLMARK CT, CASTRO VALLEY, CA 94552-1632 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Title Company | FIDELITY NATIONAL TITLE |
| Name | Verified Name |
|---|
| Document Number | 0000008064 |
|---|---|
| Date | Jan 17, 2019 |
| Instrument | 2019008064 |
| Name | MUFG UNION BANK NA |
|---|---|
| Type | Bank |
| Address | SAN DIEGO, CA 92121 |
| Type | ARM |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Feb 1, 2049 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 4.25% |
| Type Change Date | Feb 1, 2026 |
| Change Frequency | Annually |
| Min Rate At Change | 2.25% |
| Max Rate At Change | 6.25% |
| Index | 1-Year LIBOR |
| Max Rate | 10.2% |
The 2025 property tax bill for 16817 Hallmark Ct was $19,749 with a homeowner's exemption.
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 | Assessed Market Value |
|---|---|---|---|
| 2026 | $1,625,000 (+1.56%) Land $489,600 Building $1,142,400 | ||
| 2025 | $19,749.00 | $1,600,000 Land $480,000 Building $1,120,000 | |
| 2023 | $13,012.00 Homeowner's exemption | $1,036,147 Land $353,466 Building $682,681 | $1,546,200 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 16817 Hallmark Ct in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective May 25, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 16817 Hallmark Ct is high, ranking above 71% of the US, with a 0.3% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 71% of the US · above 46% of California |
|---|---|
| Wildfire Likelihood | 0.3% 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 153 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL | 100 / 20 |
May also be available: Unwired.
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