Contra Costa County property record for 488 Walnut Ave, Walnut Creek, CA 94598
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,270 sqft · built 1974 |
| Lot Size | 0.276 acres (12,000 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $2,000,000 (Aug 2020) |
| Tax Bill | $24,699 (2025) |
| Deeds & Mortgages | Aug 2020 Sale & Mortgage Mar 2019 Transfer + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 142-311-001-2 |
| Primary APN | 142-311-001-2 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Stories | 1 Story |
| Building Area | 2,270 sqft Living Area |
| Gross Area | 2,690 sqft |
| 1st Floor Area | 2,270 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1974 |
|---|---|
| Effective Year Built | Effective 2010 |
| Architectural Style | Ranch |
| Exterior Material | Stucco |
| Construction Type | Frame |
| Roof Material | Wood Shingle |
| Lot Area | 12,000 sqft (0.276 acres) |
| Garage Type | Attached |
| Garage Area | 420 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 488 WALNUT AVE |
|---|---|
| City | WALNUT CREEK |
| State | CA |
| Zip | 94598-3751 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10 |
| Legal Description | T04366 L0001 B |
| Legal Subdivision | SUBDIVISION 4366 |
| Legal Tract | 04366 |
| Legal Lot Number | 1 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 2 |
| Census Block | 2008 |
| Census Tract | 338301 |
Source: Contra Costa County assessment roll, APN 142-311-001-2, as of July 14, 2026 · Last verified July 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 | 488 WALNUT AVE, WALNUT CREEK, CA 94598-3751 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Date | Document |
|---|---|
| Aug 17, 2020 | Grant Deed, Transfer · Conventional Mortgage FIRST REPUBLIC BANK |
| Mar 22, 2019 | Affidavit of Death, Transfer OLD REPUBLIC TITLE |
| Mar 22, 2019 | Grant Deed, Transfer OLD REPUBLIC TITLE |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Aug 17, 2020 · Amount on Record |
| Deed Sale | Aug 17, 2020 · Amount on Record |
| Prior Sale | Mar 22, 2019 · Amount on Record |
| Deed Document Number | 2020173213 |
| Prior Transfer Date | Sep 29, 2003 |
| Prior Transfer Doc | 0000503185 |
| Record Updated | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Aug 17, 2020 |
| Property Address | 488 WALNUT AVE, WALNUT CREEK, CA 94598-3751 |
| Document Number | 0000173213 |
| Map Reference | MB 157 PG 19 |
| Instrument Date | Aug 13, 2020 |
| Instrument | 2020-173213 |
| Transaction Type | Transfer |
| Record Updated | Nov 03, 2022 |
| Title Company | FIRST AMERICAN TITLE COMPANY |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on File |
| 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 | 488 WALNUT AVE, WALNUT CREEK, CA 94598-3751 |
| Document Number | 0000173214 |
|---|---|
| Date | Aug 17, 2020 |
| Instrument | 2020-173214 |
| Name | FIRST REPUBLIC BANK |
|---|---|
| Type | Bank |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Sep 01, 2050 |
| Document Type | Affidavit of Death |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Mar 22, 2019 |
| Property Address | 488 WALNUT AVE, WALNUT CREEK, CA 94598-3751 |
| Document Number | 0000039340 |
| Instrument Date | Mar 21, 2019 |
| Instrument | 39340 |
| Transaction Type | Transfer |
| Record Updated | Apr 16, 2019 |
| Title Company | OLD REPUBLIC TITLE |
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Personal Trust |
| Address | 375 VICTORIA BAY ALAMEDA CA 945026524, ALAMEDA, CA 94502-6524 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Mar 22, 2019 |
| Property Address | 488 WALNUT AVE, WALNUT CREEK, CA 94598-3751 |
| Document Number | 0000039341 |
| Instrument Date | Mar 18, 2019 |
| Instrument | 39341 |
| Transaction Type | Transfer |
| Record Updated | Apr 16, 2019 |
| Title Company | OLD REPUBLIC TITLE |
| Amount | Amount Recorded |
|---|---|
| Tax | $1,013.10 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants with Right of Survivorship |
| Address | 431 LAS LOMAS WAY WALNUT CREEK CA 945984228, WALNUT CREEK, CA 94598-4228 |
Source: Contra Costa County assessment roll as of July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Walnut Creek City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $2,208,159 (+2%) Land $1,435,304 Building $772,855 | |
| 2025 | $24,699.00 (+3.92%) Homeowner's exemption | $2,164,862 (+4.04%) Land $1,407,161 Building $757,701 |
| 2023 | $23,767.00 (+0.88%) Homeowner's exemption | $2,080,800 Land $1,352,520 Building $728,280 |
| 2022 | $23,560.00 |
Source: FEMA National Flood Hazard Layer, Contra Costa County (06013C), as of October 12, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060133383012, as of September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 8 (10% premium discount) |
| Nearby Flood Policies | 1 in force |
| 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 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: FCC Broadband Data Collection, 428 locations within half a mile, as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Radiate Holdings Cable | 1,500 / 50 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
| AT&T DSL | 100 / 20 |
May also be available: Sonic Telecom.
Source: EPA Safe Drinking Water Information System, water system CA0710003, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | CONTRA COSTA WATER DISTRICT serves 210,500 people |
|---|---|
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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