Contra Costa County property record for 835 Castro St, Martinez, CA 94553
| Property Type | Commercial Office |
|---|---|
| Details | 1,792 sqft · built 1974 |
| Lot Size | 0.115 acres (5,000 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $100,000 (Jan 2017) |
| Tax Bill | $4,598 (2025) |
| Deeds & Mortgages | Jan 2017 Sale Jan 2017 Sale |
| Flood Zone | Zone AO (high risk) |
| APN | 373-201-006-5 |
| Primary APN | 373-201-006-5 |
|---|---|
| Alternative APN |
|
| Total Rooms | 1 Room |
|---|---|
| Stories | 1 Story |
| Building Area | 1,792 sqft Gross Area |
| 1st Floor Area | 1,792 sqft |
| Year Built | Built 1974 |
|---|---|
| Effective Year Built | Effective 1974 |
| Lot Area | 5,000 sqft (0.115 acres) |
| Street Address | 835 CASTRO ST |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-1611 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Commercial Office |
| Legal Description | ORIGINAL SURVEY LOT 5 BLK 32 |
| Legal Subdivision | MARTINEZ |
| Legal Block | 32 |
| Legal Lot Number | 5 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1038 |
| Census Tract | 316000 |
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 | PO BOX 3171, MARTINEZ, CA 94553-8171 |
| Owner Type | Individual |
| Vesting | Tenants in Common |
| Date | Document |
|---|---|
| Jan 3, 2017 | Quit Claim Deed, Transfer Quitclaim |
| Jan 3, 2017 | Quit Claim Deed, Transfer Quitclaim |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jan 3, 2017 · Amount on Record |
| Deed Sale | Jan 3, 2017 · Amount on Record |
| Prior Sale | Jan 3, 2017 · Amount on Record |
| Deed Document Number | 201774 |
| Prior Transfer Date | Nov 16, 2016 |
| Prior Transfer Doc | 0000000074 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Jan 3, 2017 |
| Property Address | 835 CASTRO ST, MARTINEZ, CA 94553-1611 |
| Document Number | 0000000073 |
| Instrument Date | Nov 16, 2016 |
| Instrument | 73 |
| Transaction Type | Transfer |
| Record Updated | Jan 12, 2017 |
| Amount | Amount Recorded |
|---|---|
| Tax | $110.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Separate Estate/Property |
| Address | 1543 BERRELLESA SAN DIEGO CA 92121, SAN DIEGO, CA 92121 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Jan 3, 2017 |
| Property Address | 835 CASTRO ST, MARTINEZ, CA 94553-1611 |
| Document Number | 0000000074 |
| Instrument Date | Nov 16, 2016 |
| Instrument | 74 |
| Transaction Type | Transfer |
| Record Updated | Jan 12, 2017 |
| Amount | Amount Recorded |
|---|---|
| Tax | $110.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Separate Estate/Property |
| Address | 9865 TOWNE CENTRE DR SAN DIEGO CA 921211975, SAN DIEGO, CA 92121-1975 |
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Martinez City |
| Unified School District | Martinez Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $318,616 (+2%) Land $85,859 Building $232,757 | |
| 2025 | $4,598.00 (+5.19%) | $312,370 (+4.04%) Land $84,176 Building $228,194 |
| 2023 | $4,371.00 (+0.64%) | $300,242 Land $80,908 Building $219,334 |
| 2022 | $4,343.00 |
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 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AO high risk · sheet flow 1–3 ft |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on Record median of 42 policies |
| Nearby Flood Policies | 42 in force |
| Nearby Flood Claims | 20 (1982–2017) |
| Claims Outside the SFHA | 4 of 20 |
| Most Recent Claim | Jan 2017 · Severe Winter Storms, Flooding, And Mudslides |
| Claims by Event |
|
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: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 46% of the US · lower than 72% of California |
|---|---|
| Wildfire Likelihood | 0.08% 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 | CITY OF MARTINEZ serves 31,015 people · EPA ID CA0710006 |
|---|---|
| Water Source | Purchased surface water from CONTRA COSTA WATER DISTRICT |
| Last State Inspection | Oct 2025 |
| Lead | Under 1 ppb (2023–2025) 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 371 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Astound Broadband Fiber · Cable in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 2,000 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| AT&T Fixed Wireless · DSL | 100 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
Search by:
By searching, you agree to: Terms • Privacy • Disclosures