Alameda County property record for 5848 Alderbrook Ct, Castro Valley, CA 94552
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,154 sqft · built 1985 |
| Lot Size | 0.214 acres (9,300 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $8,745 (2025) |
| Deeds & Mortgages | Feb 2018 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 85-6309-28 |
| Primary APN | 85-6309-28 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Stories | 2 Stories |
| Building Area | 2,154 sqft Living Area |
| Year Built | Built 1985 |
|---|---|
| Effective Year Built | Effective 1985 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 9,300 sqft (0.214 acres) |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 5848 ALDERBROOK CT |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94552-1748 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00085 BLK: TR: 3983 |
| Legal Tract | 3983 |
| Legal Lot Number | 85 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 1 |
| Census Block | 1001 |
| Census Tract | 430200 |
Source: Alameda County assessment roll, 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 | 2 Individual Names on File |
|---|---|
| Mailing Address | 5848 ALDERBROOK CT, CASTRO VALLEY, CA 94552-1748 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Transfer Date | Feb 9, 2018 |
| Transfer Doc | 0000034079 |
| Record Updated | Sep 20, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Feb 15, 2018 |
| Property Address | 5848 ALDERBROOK CT, CASTRO VALLEY, CA 94552-1748 |
| Document Number | 0000034079 |
| Instrument Date | Feb 9, 2018 |
| Instrument | 34079 |
| Transaction Type | Transfer |
| Record Updated | Mar 1, 2018 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property |
| Address | 5848 ALDERBROOK CT CASTRO VALLEY CA 945521748, CASTRO VALLEY, CA 94552-1748 |
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 | $680,950 (+0.96%) Land $206,385 Building $481,565 | ||
| 2025 | $8,745.00 (+4.01%) Homeowner's exemption | $674,465 (+4.04%) Land $202,339 Building $472,126 | |
| 2023 | $8,408.00 Homeowner's exemption | $648,281 Land $194,484 Building $453,797 | $1,507,230 |
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
| 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 72% of the US · above 47% of California |
|---|---|
| Wildfire Likelihood | 0.3% annual chance |
| Exposure | Direct burnable vegetation at the parcel |
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 208 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 |
| Starlink Satellite | 280 / 30 |
| Etheric Communications, LLC. Fixed Wireless | 250 / 100 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
May also be available: Unwired.
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