Contra Costa County property record for 309 E 18th St, Antioch, CA 94509 · Last verified July 2026
| Property Type | Commercial > Office > Commercial Office |
|---|---|
| Year Built | Built 2009 |
| Square Footage | 1,920 sqft Gross Area |
| Lot Size | 14,374 sqft (0.33 acres) |
| Last Sale | $125,000 (2008) |
| Tax Bill | $7,412.00 (2025) |
| Primary APN | 065-152-050-4 |
|---|---|
| Alternative APN |
|
| Total Rooms | 1 Rooms |
|---|---|
| Building Area | 1,920 sqft Gross Area |
| 1st Floor | 1,920 sqft 1st Floor |
| Stories | 1 Stories |
| Year Built | Built 2009 |
|---|---|
| Effective Year Built | Effective 2009 |
| Lot Area | 14,374 sqft (0.33 acres) |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 309 E 18TH ST |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94509-2403 |
| Property Usage | Commercial Property Usage |
| Type | Commercial > Office > Commercial Office |
| Legal Description | POR SEC 19 T2N R2E |
| Legal Range | 02E |
| Legal Township | 02N |
| Legal Section | 19 |
| Jurisdiction | CONTRA COSTA CA |
| Minor Civil Division | ANTIOCH-PITTSBURG |
| Census Blockgroup | 1 |
| Census Block | 1020 |
| Census Tract | 306003 |
Source: Contra Costa County records · APN 065-152-050-4
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 | 2 Individual Names on File |
|---|---|
| Mailing Address | 309 E 18TH ST, ANTIOCH, CA 94509-2403 |
| Owner Type | Owner is an Individual, Couple or Unincorporated Entity |
| Vesting | Joint Tenants |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Jul 23, 2008 · Amount on Record |
| Deed Sale | Jul 23, 2008 · Amount on Record |
| Prior Sale | Jan 29, 2007 · Amount on Record |
| Deed Doc Number | 2008163416 |
| Last Transfer Date | Jan 12, 2009 |
| Transfer Doc | 0000006771 |
| Record Refreshed | 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 | Antioch City |
| Unified School District | Antioch 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 | $605,245 (+2%) Land $170,105 Building $435,140 | |
| 2025 | $7,412.00 (+3.19%) | $593,378 (+4.04%) Land $166,770 Building $426,608 |
| 2023 | $7,183.00 (+0.42%) | $570,339 Land $160,295 Building $410,044 |
| 2022 | $7,153.00 |
309 E 18th St is in FEMA Zone X, outside the Special Flood Hazard Area, with no wildfire exposure.
Source: FEMA National Flood Hazard Layer · Contra Costa County (06013C), updated October 12, 2026
| FEMA Flood Zone | Zone X minimal flood hazard · outside the 0.2% annual chance floodplain |
|---|---|
| Special Flood Hazard Area | No |
Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020
| Wildfire Risk to Homes | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach of burnable land |
Values are read at the parcel center point; lenders make the official flood determination.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures