309 Warren St, Martinez, CA 94553 Property Records

Contra Costa County property record for 309 Warren St, Martinez, CA 94553

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 1,176 sqft · built 1918
Lot Size	0.083 acres (3,600 sqft)
Owner	2 Individual Names on Record
Last Sale	$550,000 (May 2018)
Tax Bill	$8,305 (2025)
Deeds & Mortgages	Jul 2017 Line of Credit Nov 2017 Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`372-301-010-8`

Property Details

APN / Parcel Number

Primary APN	`372-301-010-8`
Alternative APN	`372-301-010`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	6 Rooms
Stories	1 Story
Building Area	1,176 sqft Living Area
1st Floor Area	1,176 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1918
Effective Year Built	Effective 1964
Architectural Style	Bungalow
Exterior Material	Wood Siding
Construction Type	Frame
Roof Material	Tar & Gravel
Lot Area	3,600 sqft (0.083 acres)
Garage Type	Detached
Garage Area	282 sqft
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	Wall Unit
Heating System	Forced Air with A/C
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	309 WARREN ST
City	MARTINEZ
State	CA
Zip	94553-2434
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	ORIGINAL SURVEY POR LOTS 5 & 6 BLK 59
Legal Subdivision	MARTINEZ
Legal Block	59
Legal Lot Number	5,6
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	1
Census Block	1011
Census Tract	318000

Owner

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 Individual Names on Record
Mailing Address	309 WARREN ST, MARTINEZ, CA 94553-2434
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Jul 6, 2017	Deed of Trust, Mortgage · Line of Credit MUFG UNION BANK NA
Nov 15, 2017	Deed of Trust, Mortgage · ARM MUFG UNION BANK NA
May 17, 2018	Grant Deed, Transfer · Conventional Mortgage 1ST NTHRN CA CU

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 17, 2018 · Amount on Record
Deed Sale	May 17, 2018 · Amount on Record
Deed Document Number	201878058
Record Updated	Sep 20, 2026

July 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	309 WARREN ST, MARTINEZ, CA 94553-2434
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	LAWYERS TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000120830
Date	Jul 6, 2017
Instrument	2017-120830

Lender

Name	MUFG UNION BANK NA
Type	Bank
Address	SAN DIEGO, CA 92121

Agreement

Type	Line of Credit
Amount	Amount Recorded

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

November 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	309 WARREN ST, MARTINEZ, CA 94553-2434
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000214966
Date	Nov 15, 2017
Instrument	2017-214966

Lender

Name	MUFG UNION BANK NA
Type	Bank
Address	SAN DIEGO, CA 92121

Agreement

Type	ARM
Amount	Amount Recorded
Term	481 Months
Due	Dec 1, 2057

Interest

Rate Type	Adjustable Rate
Rate	4.62%
Type Change Date	Dec 1, 2024
Change Frequency	Annually
Min Rate At Change	2.62%
Max Rate At Change	6.62%
Index	1-Year LIBOR
Max Rate	10.6%

May 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	May 17, 2018
Property Address	309 WARREN ST, MARTINEZ, CA 94553-2434
Document Number	0000078058
Instrument Date	May 3, 2018
Instrument	78058
Transaction Type	Transfer
Record Updated	Nov 21, 2018
Title Company	OLD REPUBLIC TITLE COMPANY CONCORD, OLD REPUBLIC TITLE CO CONCORD

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$605.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property
Address	309 WARREN ST MARTINEZ CA 945532434, MARTINEZ, CA 94553-2434

Mortgage

Document Number	78059
Date	May 17, 2018
Instrument	78059

Lender

Name	1ST NTHRN CA CU
Address	MARTINEZ, CA 94553

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	May 16, 2048

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	Martinez City
Unified School District	Martinez Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$638,315 (+2%) Land $417,808 Building $220,507
2025	$8,305.00 (+6.47%)	$625,800 (+4.04%) Land $409,616 Building $216,184
2023	$7,800.00 (+1.66%)	$601,502 Land $393,711 Building $207,791
2022	$7,673.00

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 X minimal risk
Nearest Special Flood Hazard Area	Zone AO, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 23 policies
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	23 in force
Nearby Flood Claims	12 (1980–2022)
Claims Outside the SFHA	3 of 12
Most Recent Claim	Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Storms, Flooding, Mudslides, And Landslides, Jan 2006 · 5 claims Severe Storms, Flooding, Mud And Landslides, Jan 1997 · 2 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	Moderate above 48% of the US · lower than 71% of California
Wildfire Likelihood	0.1% annual chance
Exposure	Indirect 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 MARTINEZ serves 31,015 people · EPA ID CA0710006
Water Source	Purchased surface water from CONTRA COSTA WATER DISTRICT
Last State Inspection	Oct 2025
Lead	Under 1 ppb (2023–2025) 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 853 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL	5,000 / 5,000
Xfinity Cable	2,000 / 250
Astound Broadband Fiber · Cable in parts of the area	1,500 / 1,500
Verizon Fixed Wireless	300 / 20
T-Mobile Fixed Wireless	100 / 20

May also be available: Unwired.

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