521 Allen St, Martinez, CA 94553 Property Records

Contra Costa County property record for 521 Allen St, Martinez, CA 94553

Property Summary

Property Type	Duplex
Details	3 bd · 2.5 ba · 2,222 sqft · built 1938
Lot Size	0.087 acres (3,800 sqft)
Owner	Individual Name on File
Last Sale	$720,000 (Sep 2021)
Tax Bill	$10,042 (2025)
Deeds & Mortgages	May 2022 Re-recorded Document Sep 2021 Sale & Mortgage + 1 more
Flood Zone	Zone AO (high risk)
APN	`372-283-005`

Property Details

APN / Parcel Number

Primary APN	`372-283-005`
Alternative APN	`372-283-005-0`

Interior

Bedrooms	3 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	10 Rooms
Stories	1 Story
Building Area	2,222 sqft Living Area
1st Floor Area	1,109 sqft
Basement Area	1,113 sqft

Exterior

Year Built	Built 1938
Effective Year Built	Effective 1970
Architectural Style	Duplex Single
Lot Area	3,800 sqft (0.087 acres)

Location & Zoning

Street Address	521 ALLEN ST
City	MARTINEZ
State	CA
Zip	94553-2610
Property Category	Residential
Property Type	Residential > Multi-Unit > Duplex
Local Zoning Code	R1
Legal Description	ORIGINAL SURVEY POR 7 77
Legal Subdivision	MARTINEZ
Legal Block	77
Legal Lot Number	7
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	1
Census Block	1003
Census Tract	318000

Owner

521 Allen St, a duplex, is owned and occupied by an individual who acquired it in May 2022.

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

Owner of Record	Individual Name on File
Mailing Address	521 ALLEN ST, MARTINEZ, CA 94553-2610
Occupancy	Owner Occupied
Owner Type	Individual

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
May 25, 2022	Re-recorded Document OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY
Sep 27, 2021	Grant Deed, Transfer · Conventional Mortgage PATELCO CU
Mar 22, 2021	Intrafamily Transfer, Transfer

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Sep 27, 2021 · Amount on File
Deed Sale	Sep 27, 2021 · Amount on File
Prior Sale	Aug 8, 2014 · Amount on File
Deed Document Number	2021267554
Last Transfer Date	May 24, 2022
Transfer Doc	0000088941
Record Updated	Sep 20, 2026

May 2022: Re-recorded Document

Document Type	Re-recorded Document
Jurisdiction	CONTRA COSTA CA
Recording Date	May 25, 2022
Property Address	521 ALLEN ST, MARTINEZ, CA 94553-2610
Document Number	0000088941
Instrument Date	May 24, 2022
Instrument	2022-088941
Record Updated	Nov 3, 2022
Title Company	OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	521 ALLEN ST, MARTINEZ, CA 94553-2610

September 2021: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Sep 27, 2021
Property Address	521 ALLEN ST, MARTINEZ, CA 94553-2610
Document Number	0000267554
Instrument Date	Sep 16, 2021
Instrument	2021-267554
Transaction Type	Transfer
Record Updated	Nov 3, 2022
Title Company	OLD REPUBLIC TITLE, OLD REPUBLIC 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
Address	521 ALLEN ST, MARTINEZ, CA 94553-2610

Mortgage

Document Number	0000267555
Date	Sep 27, 2021
Instrument	2021-267555

Lender

Name	PATELCO CU
Type	Credit Union

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Oct 1, 2051

March 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Mar 22, 2021
Property Address	521 ALLEN ST, MARTINEZ, CA 94553-2610
Document Number	0000086370
Instrument Date	Mar 16, 2021
Instrument	2021-086370
Transaction Type	Transfer
Record Updated	Jun 7, 2023

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	132 BENEDICT CT, PACHECO, CA 94553-5308

Tax Assessment & Valuation

The 2025 property tax bill for 521 Allen St was $10,042.

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		$779,348 (+2%) Land $535,802 Building $243,546
2025	$10,042.00	$764,068 Land $525,297 Building $238,771
2023	$9,438.00 (+15.62%)	$734,400 Land $504,900 Building $229,500
2022	$8,163.00

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

Flood

FEMA maps place 521 Allen St in Zone AO, a high-risk flood area; flood insurance is required for federally backed loans.

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

FEMA Flood Zone	Zone AO high risk · sheet flow 1–3 ft
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 File 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

Wildfire risk around 521 Allen St is low, with a 0.04% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Low lower than 64% of the US · lower than 78% of California
Wildfire Likelihood	0.04% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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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