Contra Costa County property record for 520 Walnut Ave, Martinez, CA 94553 · Last verified July 2026
| Property Type | Single Family Home |
|---|---|
| Details | 1 bd · 1 ba · 1,017 sqft · built 2013 |
| Lot Size | 0.18 acres (7,840 sqft) |
| Owner | Individual Name on File |
| Last Sale | $294,000 (Aug 2008) |
| Tax Bill | $5,577 (2025) |
| Flood Zone | Zone AO (high risk) |
| APN | 370-292-005-3 |
| Primary APN | 370-292-005-3 |
|---|---|
| Alternative APN |
|
| Bedrooms | 1 Bed |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,017 sqft Living Area |
| 1st Floor Area | 1,017 sqft |
| Year Built | Built 2013 |
|---|---|
| Effective Year Built | Effective 2019 |
| Lot Area | 7,840 sqft (0.18 acres) |
| Garage Type | Attached |
| Garage Area | 522 sqft |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Central |
|---|
| Street Address | 520 WALNUT AVE |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-3933 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | POR RO EL PINOLE |
| Legal Subdivision | RANCHO EL PINOLE |
| Legal Block | 28 |
| Legal Lot Number | 5 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3026 |
| Census Tract | 318000 |
Source: Contra Costa County records · APN 370-292-005-3
Assessment roll updated 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 | Individual Name on File |
|---|---|
| Mailing Address | 520 WALNUT AVE, MARTINEZ, CA 94553-3933 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Single Person |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Aug 14, 2008 · Amount on Record |
| Deed Sale | Aug 14, 2008 · Amount on Record |
| Prior Sale | Oct 12, 2007 · Amount on Record |
| Deed Document Number | 2008181371 |
| Prior Transfer Date | May 10, 2006 |
| Prior Transfer Doc | 0000155525 |
| Record Updated | Sep 20, 2026 |
Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Martinez City |
| Unified School District | Martinez 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 | $427,693 (+8.95%) Land $262,693 Building $165,000 | |
| 2025 | $5,577.00 (-2.16%) | $392,543 (-5.99%) Land $257,543 Building $135,000 |
| 2023 | $5,700.00 (+3.02%) | $417,544 Land $247,544 Building $170,000 |
| 2022 | $5,533.00 |
Source: FEMA National Flood Hazard Layer, Contra Costa County (06013C), updated October 12, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone AO sheet flow 1–3 ft |
|---|---|
| Flood Hazard | High |
| 100-Year Floodplain | Yes 1% annual chance |
| Special Flood Hazard Area | Yes |
| Flood Insurance Requirement | Required (federally backed mortgages) |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Wildfire Risk | Moderate above 64% of the US · above 39% of California |
|---|---|
| Wildfire Likelihood | About 1 in 459 per year |
| Exposure | Direct burnable vegetation at the parcel |
Values are read at the parcel center point; lenders make the official flood determination.
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