2312 L St, Antioch, CA 94509 Property Records

Contra Costa County property record for 2312 L St, Antioch, CA 94509

Property Summary

Property Type	Quadplex
Details	3,350 sqft · built 1977
Lot Size	0.172 acres (7,500 sqft)
Owner	2 Individual Names on File
Last Sale	$1,224,500 (Mar 2023)
Tax Bill	$16,451 (2025)
Deeds & Mortgages	Mar 2023 Sale & Mortgage Oct 2018 Sale
Flood Zone	Zone X (minimal risk)
APN	`074-351-021-6`

Property Details

APN / Parcel Number

Primary APN	`074-351-021-6`
Alternative APN	`074-351-021`

Interior

Total Rooms	4 Rooms
Stories	1 Story
Building Area	3,350 sqft Living Area
1st Floor Area	3,350 sqft

Exterior

Year Built	Built 1977
Effective Year Built	Effective 2005
Architectural Style	Quadruplex
Lot Area	7,500 sqft (0.172 acres)
Garage Type	Carport
Carport	Carport
Parking Spaces	4 Parking Spaces

Location & Zoning

Street Address	2312 L ST
City	ANTIOCH
State	CA
Zip	94509-3437
Property Category	Residential
Property Type	Residential > Multi-Unit > Quadplex
Legal Description	TRACT 3904 LOT 49
Legal Subdivision	SUBDIVISION 3904
Legal Tract	3904
Legal Lot Number	49
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	ANTIOCH-PITTSBURG
Census Block Group	2
Census Block	2007
Census Tract	307202

Owner

2312 L St, a quadplex, is owned by two individuals who bought it in March 2023.

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

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

Owner of Record	2 Individual Names on File
Mailing Address	2135 RENAISSANCE CT, BRENTWOOD, CA 94513-2431
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Date	Document
Mar 30, 2023	Grant Deed, Transfer · Conventional Mortgage FIRST REPUBLIC BANK
Oct 16, 2018	Grant Deed, Transfer OLD REPUBLIC TITLE

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 30, 2023 · Amount on File
Deed Sale	Mar 30, 2023 · Amount on File
Prior Sale	Oct 16, 2018 · Amount on File
Deed Document Number	202329493
Prior Transfer Date	Dec 26, 2013
Prior Transfer Doc	0000296075
Record Updated	Oct 29, 2026

March 2023: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Mar 30, 2023
Property Address	2312 L ST, ANTIOCH, CA 94509-3437
Document Number	0000029493
Map Reference	MB 126 PG 44
Instrument Date	Mar 27, 2023
Instrument	2023-029493
Transaction Type	Transfer
Record Updated	Apr 7, 2023
Title Company	CHICAGO TITLE COMPANY

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	2135 RENAISSANCE CT, BRENTWOOD, CA 94513-2431

Mortgage

Document Number	0000029494
Date	Mar 30, 2023
Instrument	2023-029494

Lender

Name	FIRST REPUBLIC BANK
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Apr 1, 2053

Interest

Rate Type	Adjustable Rate
Rate	4.7%
Type Change Date	Jun 1, 2028
Min Rate At Change	3.95%
Max Rate At Change	10.9%
Index	Other
Max Rate	10.9%

October 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Oct 16, 2018
Property Address	2312 L ST, ANTIOCH, CA 94509-3437
Document Number	0000164118
Instrument Date	Oct 12, 2018
Instrument	164118
Transaction Type	Transfer
Record Updated	Oct 29, 2018
Title Company	OLD REPUBLIC TITLE

Transaction

Amount	Amount on Record
Tax	$1,475.10
Amount Accuracy	Full Value
Additional	Arm's Length Multiple Parcels

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	524 ISABEL DR MARTINEZ CA 945536615, MARTINEZ, CA 94553-6615

Tax Assessment & Valuation

The 2025 property tax bill for 2312 L St was $16,451.

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		$1,299,447 (+2%) Land $212,241 Building $1,087,206
2025	$16,451.00	$1,273,969 Land $208,080 Building $1,065,889
2023	$9,966.00 (+1.4%)	$718,694 Land $214,439 Building $504,255
2022	$9,828.00

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

Flood

FEMA maps place 2312 L St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.

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

FEMA Flood Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
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 2312 L 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 561 locations within half a mile, as of December 31, 2025

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

May also be available: Verizon.

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