Contra Costa County property record for 503 W 3rd St, Antioch, CA 94509
| Property Type | Parking Lot |
|---|---|
| Lot Size | 0.115 acres (5,000 sqft) |
| Owner | 2 Company Names on Record |
| Tax Bill | $1,296 (2025) |
| Deeds & Mortgages | Oct 2019 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 066-056-016 |
| Primary APN | 066-056-016 |
|---|---|
| Alternative APN |
|
| Lot Area | 5,000 sqft (0.115 acres) |
|---|
| Street Address | 503 W 3RD ST |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94509-1275 |
| Property Category | Commercial |
| Property Type | Commercial > Retail > Parking Lot |
| Legal Description | TOWN OF ANTIOCH LOT 2 BLK 23 |
| Legal Subdivision | ANTIOCH |
| Legal Block | 23 |
| Legal Lot Number | 2 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | ANTIOCH-PITTSBURG |
| Census Block Group | 3 |
| Census Block | 3027 |
| Census Tract | 305000 |
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 Company Names on Record |
|---|---|
| Mailing Address | 119 W 6TH ST, ANTIOCH, CA 94509-1751 |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Sep 30, 2019 |
| Transfer Doc | 0000165738 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Oct 2, 2019 |
| Property Address | 503 W 3RD ST, ANTIOCH, CA 94509 |
| Document Number | 0000165738 |
| Instrument Date | Sep 30, 2019 |
| Instrument | 165738 |
| Transaction Type | Transfer |
| Record Updated | Oct 8, 2020 |
| Title Company | NOT AVAILABLE |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Revocable Trust |
| Address | 503-511 W 3RD ST ANTIOCH CA 94509, ANTIOCH, CA 94509 |
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Antioch City |
| Unified School District | Antioch Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $107,701 (+2%) Land $90,402 Building $17,299 | |
| 2025 | $1,296.00 (+3.93%) | $105,590 (+4.04%) Land $88,630 Building $16,960 |
| 2023 | $1,247.00 (+1.55%) | $101,492 Land $85,190 Building $16,302 |
| 2022 | $1,228.00 |
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 X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 5 in force |
| Nearby Flood Claims | 1 (2017) |
| Most Recent Claim | Feb 2017 · Severe Winter Storms, Flooding, And Mudslides |
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 | Not rated no burnable land 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 ANTIOCH serves 116,781 people · EPA ID CA0710001 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2024 |
| 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.
Source: FCC Broadband Data Collection, based on 374 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
May also be available: T-Mobile, Verizon.
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