Alameda County property record for 18640 Madison Ave, Castro Valley, CA 94546
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1.5 ba · 1,182 sqft · built 1952 |
| Lot Size | 0.123 acres (5,355 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $6,908 (2025) |
| Deeds & Mortgages | Dec 2020 Mortgage Feb 2020 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 84C-880-10 |
| Primary APN | 84C-880-10 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,182 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1952 |
|---|---|
| Effective Year Built | Effective 1953 |
| Architectural Style | L-Shape |
| Exterior Material | Stucco |
| Construction Type | Wood |
| Roof Material | Composition Shingle |
| Lot Area | 5,355 sqft (0.123 acres) |
| Sewer | Municipal |
|---|---|
| Water Source | Commercial |
| Street Address | 18640 MADISON AVE |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-2542 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00010 BLK: AR: 084C PAGE: 0880 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 2 |
| Census Block | 2001 |
| Census Tract | 430200 |
18640 Madison Ave is owned and occupied by two individuals.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 18640 MADISON AVE, CASTRO VALLEY, CA 94546-2542 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Dec 17, 2020 | Deed of Trust, Mortgage · Conventional Mortgage UNITED WHOLESALE MORTGAGE |
| Feb 19, 2020 | Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LNS |
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Property Address | 18640 MADISON AVE, CASTRO VALLEY, CA 94546-2542 |
| Transaction Type | Mortgage |
| Record Updated | Feb 17, 2021 |
| Title Company | CHICAGO TITLE COMPANY |
| Name | Verified Name |
|---|---|
| Address | 18640 MADISON AVE, CASTRO VALLEY, CA 94546-2542 |
| Document Number | 0000355358 |
|---|---|
| Date | Dec 17, 2020 |
| Instrument | 2020355358 |
| Name | UNITED WHOLESALE MORTGAGE |
|---|---|
| Type | Mortgage Company |
| Address | PONTIAC, MI 48341 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Jan 1, 2051 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Property Address | 18640 MADISON AVE, CASTRO VALLEY, CA 94546-2542 |
| Document Number | 0000044493 |
| Instrument Date | Feb 19, 2020 |
| Transaction Type | Mortgage |
| Record Updated | Apr 24, 2020 |
| Title Company | STEWART TITLE |
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants with Right of Survivorship |
| Address | 18640 MADISON AVE CASTRO VALLEY CA 945462542, CASTRO VALLEY, CA 94546-2542 |
| Document Number | 0000044493 |
|---|---|
| Date | Feb 25, 2020 |
| Instrument | 44493 |
| Name | QUICKEN LNS |
|---|---|
| Type | Funding / Finance Company |
| Address | DETROIT, MI 48226-1906 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Feb 24, 2050 |
The 2025 property tax bill for 18640 Madison Ave was $6,908.
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 | $522,049 (+2%) Land $203,019 Building $319,030 | ||
| 2025 | $6,908.00 | $511,815 Land $199,039 Building $312,776 | |
| 2023 | $6,635.00 | $491,943 Land $191,311 Building $300,632 | $843,390 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 18640 Madison Ave in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Claims | 1 (1998) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Feb 1998 · rainfall accumulation |
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 18640 Madison Ave is low, with a 0.02% annual chance of wildfire.
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 | 0.02% annual chance |
| Exposure | Indirect within 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 412 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.
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