Alameda County property record for 4280 Circle Ave, Castro Valley, CA 94546
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1.5 ba · 1,312 sqft · built 1954 |
| Lot Size | 0.132 acres (5,760 sqft) |
| Owner | Company Name on Record |
| Tax Bill | $2,248 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 84C-685-5 |
| Primary APN | 84C-685-5 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,312 sqft Living Area |
| Year Built | Built 1954 |
|---|---|
| Effective Year Built | Effective 1954 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 5,760 sqft (0.132 acres) |
| Street Address | 4280 CIRCLE AVE |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-4603 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00009 BLK: TR: 1245 |
| Legal Tract | 1245 |
| Legal Lot Number | 9 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 2 |
| Census Block | 2003 |
| Census Tract | 430800 |
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 | Company Name on Record |
|---|---|
| Mailing Address | 15267 HARDIN ST, SAN LEANDRO, CA 94579-1603 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Borrower in Default |
| Deed Names | Name on Deed |
|---|---|
| Last Transfer Date | Mar 3, 2010 |
| Transfer Doc | 0000057375 |
| Record Updated | Sep 20, 2026 |
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 | $119,338 (-3.65%) Land $53,014 Building $73,324 | ||
| 2025 | $2,248.00 (+5.79%) Homeowner's exemption | $123,861 (+4.04%) Land $51,975 Building $71,886 | |
| 2023 | $2,125.00 Homeowner's exemption | $119,052 Land $49,957 Building $69,095 | $917,640 |
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 |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Claims | 1 (1997) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Nov 1997 · river or lake flooding |
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 | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | None beyond 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 804 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 · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Etheric Networks, GeoLinks.
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