Contra Costa County property record for 18 Mount Wilson Way, Clayton, CA 94517
| Property Type | Townhouse |
|---|---|
| Details | 2 bd · 2 ba · 966 sqft · built 1973 |
| Lot Size | 0.047 acres (2,025 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $470,000 (Oct 2019) |
| Tax Bill | $6,921 (2025) |
| Deeds & Mortgages | Dec 2021 Mortgage Oct 2019 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 119-231-009 |
| Primary APN | 119-231-009 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 966 sqft Living Area |
| 1st Floor Area | 966 sqft |
| Year Built | Built 1973 |
|---|---|
| Effective Year Built | Effective 1990 |
| Architectural Style | Townhouse |
| Lot Area | 2,025 sqft (0.047 acres) |
| Garage Type | Attached |
| Garage Area | 434 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|
| Street Address | 18 MT WILSON WAY |
|---|---|
| City | CLAYTON |
| State | CA |
| Zip | 94517-1643 |
| Property Category | Residential |
| Property Type | Residential > Condominium / Townhouse > Townhouse |
| Local Zoning Code | PUD |
| Legal Description | TRACT 4240 LOT 9 |
| Legal Subdivision | SUBDIVISION 4240 |
| Legal Tract | 4240 |
| Legal Lot Number | 9 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 4 |
| Census Block | 4000 |
| Census Tract | 355306 |
Source: Contra Costa County records, as of July 14, 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 Record |
|---|---|
| Mailing Address | 18 MT WILSON WAY, CLAYTON, CA 94517-1643 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Date | Document |
|---|---|
| Dec 30, 2021 | Intrafamily Transfer, Transfer · Conventional Mortgage UNITED WHOLESALE MORTGAGE |
| Oct 18, 2019 | Grant Deed, Transfer · Conventional Mortgage MIDWEST EQUITY MORTGAGE LLC |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Oct 18, 2019 · Amount on Record |
| Deed Sale | Oct 18, 2019 · Amount on Record |
| Prior Sale | Nov 19, 2014 · Amount on Record |
| Deed Document Number | 2019177499 |
| Last Transfer Date | Dec 27, 2021 |
| Transfer Doc | 0000349866 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Dec 30, 2021 |
| Property Address | 18 MT WILSON WAY, CLAYTON, CA 94517-1643 |
| Document Number | 0000349866 |
| Map Reference | MB 153 PG 3 |
| Instrument Date | Dec 27, 2021 |
| Instrument | 2021-349866 |
| Transaction Type | Transfer |
| Record Updated | Nov 3, 2022 |
| Title Company | E-CHICAGO TITLE, CHICAGO TITLE |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 18 MT WILSON WAY, CLAYTON, CA 94517-1643 |
| Document Number | 0000349867 |
|---|---|
| Date | Dec 30, 2021 |
| Instrument | 2021-349867 |
| Name | UNITED WHOLESALE MORTGAGE |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Jan 1, 2052 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Oct 18, 2019 |
| Property Address | 18 MT WILSON WAY, CLAYTON, CA 94517-1643 |
| Document Number | 0000177499 |
| Map Reference | MB 153 PG 3 |
| Instrument Date | Oct 14, 2019 |
| Instrument | 2019-177499 |
| Transaction Type | Transfer |
| Record Updated | Nov 3, 2022 |
| Title Company | OLD REPUBLIC TITLE COMPANY |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 18 MT WILSON WAY, CLAYTON, CA 94517-1643 |
| Document Number | 0000177500 |
|---|---|
| Date | Oct 18, 2019 |
| Instrument | 2019-177500 |
| Name | MIDWEST EQUITY MORTGAGE LLC |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Nov 1, 2049 |
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Clayton City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $524,289 (+2%) Land $412,739 Building $111,550 | |
| 2025 | $6,921.00 (+4.78%) Homeowner's exemption | $514,010 (+4.04%) Land $404,647 Building $109,363 |
| 2023 | $6,605.00 (+1.55%) Homeowner's exemption | $494,052 Land $388,935 Building $105,117 |
| 2022 | $6,504.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
Source: FEMA National Flood Hazard Layer, effective October 12, 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 |
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 | Moderate above 56% of the US · lower than 66% of California |
|---|---|
| Wildfire Likelihood | 0.1% 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 | CONTRA COSTA WATER DISTRICT serves 210,500 people · EPA ID CA0710003 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2022 |
| Lead | Under 1 ppb (2026–2028) 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.
Source: FCC Broadband Data Collection, based on 420 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
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