437 O St, Antioch, CA 94509 Property Records

Contra Costa County property record for 437 O St, Antioch, CA 94509

Property Summary

Property Type	Commercial Office
Details	3,300 sqft · built 1957
Lot Size	0.459 acres (20,000 sqft)
Owner	2 Company Names on Record
Last Sale	$200,000 (Sep 2012)
Tax Bill	$7,212 (2025)
Deeds & Mortgages	Jul 2026 Sale
Flood Zone	Zone AE (high risk)
APN	`066-124-003-6`

Property Details

APN / Parcel Number

Primary APN	`066-124-003-6`
Alternative APN	`066-124-003`

Interior

Stories	1 Story
Building Area	3,300 sqft Gross Area
1st Floor Area	3,300 sqft

Exterior

Year Built	Built 1957
Effective Year Built	Effective 1957
Lot Area	20,000 sqft (0.459 acres)

Location & Zoning

Street Address	437 O ST
City	ANTIOCH
State	CA
Zip	94509-1009
Property Category	Commercial
Property Type	Commercial > Office > Commercial Office
Legal Description	TOWN OF ANTIOCH LOTS 7 TO 10 INCL BLK 80
Legal Subdivision	ANTIOCH
Legal Block	80
Legal Lot Number	7-10
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	ANTIOCH-PITTSBURG
Census Block Group	5
Census Block	5009
Census Tract	305000

Owner

Source: Contra Costa County records, as of August 6, 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	4296 GOLDENHILL DR, PITTSBURG, CA 94565-6242
Owner Type	Company
Vesting	Trust, Family Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Sep 12, 2012 · Amount on Record
Deed Sale	Sep 12, 2012 · Amount on Record
Deed Document Number	2012221700
Last Transfer Date	Jul 14, 2026
Transfer Doc	0000074441
Record Updated	Oct 29, 2026

July 2026: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Jul 15, 2026
Property Address	437 O ST, ANTIOCH, CA 94509-1009
Document Number	0000074441
Instrument Date	Jul 14, 2026
Instrument	202674441
Transaction Type	Transfer
Record Updated	Aug 31, 2026
Title Company	NONE LISTED ON DOCUMENT

Transaction

Tax	$0.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust
Address	4296 GOLDENHILL DR, PITTSBURG, CA 94565-6242
Investor	Possibly a Property Investor

Tax Assessment & Valuation

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Municipality	Antioch City
Unified School District	Antioch Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$251,196 (+2%) Land $81,637 Building $169,559
2025	$7,212.00 (+122.52%)	$246,272 (+4.04%) Land $80,037 Building $166,235
2023	$3,241.00 (+2.56%)	$236,711 Land $76,930 Building $159,781
2022	$3,160.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone AE high risk
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 16 policies
Nearby Flood Policies	16 in force
Nearby Flood Claims	47 (1982–2022)
Claims Outside the SFHA	15 of 47
Most Recent Claim	Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Winter Storms, Flooding, And Mudslides, Feb 2017 · 4 claims Severe Storms, Flooding, Mudslides, And Landslides, Jan 2006 · 5 claims Coastal Storms, Floods, Slides & Tornadoes, Feb 1983 · 5 claims

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.

Wildfire

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.

Drinking Water

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

Violations Reported to EPA

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.

Internet Providers

Source: FCC Broadband Data Collection, based on 372 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL · Fixed Wireless in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
Verizon Fixed Wireless	300 / 20