Alameda County property record for 18511 Mountain Ln, Castro Valley, CA 94552
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 2 ba · 1,979 sqft · built 1963 |
| Lot Size | 0.181 acres (7,878 sqft) |
| Owner | Individual Name on File |
| Last Sale | $1,285,000 (Dec 2015) |
| Tax Bill | $18,736 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 85-1605-30-3 |
| Primary APN | 85-1605-30-3 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,979 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1963 |
|---|---|
| Effective Year Built | Effective 1964 |
| Architectural Style | H-Shape |
| Exterior Material | Wood Siding |
| Construction Type | Wood |
| Roof Material | Tar & Gravel |
| Lot Area | 7,878 sqft (0.181 acres) |
| Heating System | Radiant |
|---|---|
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 18511 MOUNTAIN LN |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94552-1833 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00003 BLK: 000A TR: 2295 ;LOT: 00013 BLK: 000D TR: 2166 ;LOT: 00014 BLK: 000D TR: 2166 |
| Legal Tract | 2295 |
| Legal Block | A |
| Legal Lot Number | 3 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 1 |
| Census Block | 1016 |
| Census Tract | 430102 |
18511 Mountain Ln is owned and occupied by an individual who bought it in December 2015.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 18511 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1833 |
| 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 | Name on Deed |
|---|---|
| Last Sale | Dec 18, 2015 · Amount on File |
| Deed Sale | Dec 18, 2015 · Amount on File |
| Prior Sale | Nov 24, 2008 · Amount on File |
| Deed Document Number | 2015331497 |
| Prior Transfer Date | Feb 24, 2005 |
| Prior Transfer Doc | 0000111884 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 18511 Mountain Ln was $18,736 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 | $1,544,560 (+1.54%) Land $465,468 Building $1,086,092 | ||
| 2025 | $18,736.00 Homeowner's exemption | $1,521,144 Land $456,343 Building $1,064,801 | |
| 2023 | $18,068.00 Homeowner's exemption | $1,462,085 Land $438,625 Building $1,023,460 | $1,439,280 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 18511 Mountain Ln 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 18511 Mountain Ln 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 389 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · 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: Unwired.
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