800 C St, Antioch, CA 94509 Property Records

Contra Costa County property record for 800 C St, Antioch, CA 94509

Property Summary

Property Type	Medical Building
Details	3,557 sqft · built 1956
Lot Size	0.321 acres (14,000 sqft)
Owner	Trust Name on File
Last Sale	$895,000 (Jan 2007)
Tax Bill	$15,989 (2025)
Deeds & Mortgages	Jul 2018 Mortgage Jul 2018 Line of Credit + 1 more
Flood Zone	Zone X (minimal risk)
APN	`066-185-010-7`

Property Details

APN / Parcel Number

Primary APN	`066-185-010-7`
Alternative APN	`066-185-010`

Interior

Total Rooms	1 Room
Stories	1 Story
Building Area	3,557 sqft Gross Area
1st Floor Area	3,557 sqft

Exterior

Year Built	Built 1956
Effective Year Built	Effective 1956
Exterior Material	Wood Siding
Construction Type	Frame
Roof Type	Hip
Roof Material	Composition Shingle
Lot Area	14,000 sqft (0.321 acres)
Lot Dimensions	100 ft deep x 140 ft wide

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Forced Air with A/C

Location & Zoning

Street Address	800 C ST
City	ANTIOCH
State	CA
Zip	94509-1719
Property Category	Commercial
Property Type	Commercial > Office > Medical Building
Legal Description	TOWN OF ANTIOCH LOTS 1 & 2 POR LOT 3 BLK 96
Legal Subdivision	ANTIOCH
Legal Block	96
Legal Lot Number	1,2,3
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	ANTIOCH-PITTSBURG
Census Block Group	1
Census Block	1015
Census Tract	305000

Owner

800 C St, a commercial property, is held in a trust since January 2007.

Source: Contra Costa County records, as of July 14, 2026

Owner of Record	Trust Name on File
Mailing Address	811 MEADOW CREEK CT, WALNUT CREEK, CA 94596-5346
Owner Type	Company
Vesting	Trust

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Date	Document
Jul 27, 2018	Deed of Trust, Mortgage · Commercial Mortgage FIRST CITIZENS BANK & TRUST CO
Jul 27, 2018	Deed of Trust, Mortgage · Line of Credit FIRST CITIZENS BANK & TRUST COMPANY
Aug 2, 2019	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jan 31, 2007 · Amount on File
Deed Sale	Jan 31, 2007 · Amount on File
Deed Document Number	200729887
Prior Transfer Date	Oct 17, 1994
Prior Transfer Doc	0000262738
Record Updated	Oct 29, 2026

July 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	800 C ST, ANTIOCH, CA 94509-1719
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	NORTH AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000120507
Date	Jul 27, 2018
Instrument	2018-120507

Lender

Name	FIRST CITIZENS BANK & TRUST CO
Type	Bank
Address	RALEIGH, NC 27611

Agreement

Type	Commercial Mortgage
Amount	Amount on Record

July 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	800 C ST, ANTIOCH, CA 94509-1719
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	NORTH AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000120510
Date	Jul 27, 2018
Instrument	2018-120510

Lender

Name	FIRST CITIZENS BANK & TRUST COMPANY
Type	Non-Lending Institution
Address	RALEIGH, NC 27611

Agreement

Type	Line of Credit
Amount	Amount on Record

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

August 2019: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Aug 2, 2019
Property Address	800 C ST, ANTIOCH, CA 94509-1719
Document Number	0000121323
Instrument Date	Jul 27, 2019
Instrument	121323
Transaction Type	Transfer
Record Updated	Aug 8, 2019
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	811 MEADOW CREEK CT WALNUT CREEK CA 945965346, WALNUT CREEK, CA 94596-5346

Tax Assessment & Valuation

The 2025 property tax bill for 800 C St was $15,989.

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		$1,223,074 (+2%) Land $401,765 Building $821,309
2025	$15,989.00	$1,199,093 Land $393,888 Building $805,205
2023	$15,084.00 (+1.49%)	$1,152,533 Land $378,594 Building $773,939
2022	$14,862.00

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

Flood

FEMA maps place 800 C St in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective October 12, 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

The area around 800 C St has no burnable land within ember reach, so its wildfire risk is not rated.

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 593 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
T-Mobile Fixed Wireless	100 / 20

May also be available: Verizon.

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