4151 S Castro St, Martinez, CA 94553 Property Records

Contra Costa County property record for 4151 S Castro St, Martinez, CA 94553

Property Summary

Property Type	Single Family Home
Details	5 bd · 2.5 ba · 1,843 sqft · built 1947
Lot Size	0.23 acres (10,018 sqft)
Owner	Individual Name on Record
Last Sale	$575,000 (Jul 2015)
Tax Bill	$8,876 (2025)
Deeds & Mortgages	May 2017 Mortgage Nov 2019 Mortgage + 1 more
Flood Zone	Zone AO (high risk)
APN	`370-291-009-6`

Property Details

APN / Parcel Number

Primary APN	`370-291-009-6`
Alternative APN	`370-291-009`

Interior

Bedrooms	5 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	7 Rooms
Stories	2 Stories
Building Area	1,843 sqft Living Area
1st Floor Area	1,360 sqft
2nd Floor Area	483 sqft

Exterior

Year Built	Built 1947
Effective Year Built	Effective 1965
Lot Area	10,018 sqft (0.23 acres)
Garage Type	Attached
Garage Area	414 sqft
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	4151 S CASTRO ST
City	MARTINEZ
State	CA
Zip	94553-3951
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	POR RO EL PINOLE
Legal Subdivision	EL PINOLE RHO
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	3
Census Block	3017
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	Individual Name on Record
Mailing Address	4151 S CASTRO ST, MARTINEZ, CA 94553-3951
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Sole Owner

Deeds, Mortgages & Sale History

Date	Document
May 26, 2017	Deed of Trust, Mortgage · Conventional Mortgage GUILD MORTGAGE CO
Nov 15, 2019	Deed of Trust, Mortgage · Conventional Mortgage GUILD MORTGAGE CO
Dec 15, 2020	Deed of Trust, Mortgage · Conventional Mortgage GUILD MORTGAGE CO

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jul 10, 2015 · Amount on Record
Deed Sale	Jul 10, 2015 · Amount on Record
Prior Sale	Apr 21, 2000 · Amount on Record
Deed Document Number	2015142961
Prior Transfer Date	Jul 8, 2015
Prior Transfer Doc	0000142962
Record Updated	Sep 20, 2026

May 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	4151 S CASTRO ST, MARTINEZ, CA 94553-3951
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	OLD REPUBLIC TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000093891
Date	May 26, 2017
Instrument	2017-093891

Lender

Name	GUILD MORTGAGE CO
Type	Mortgage Company
Address	SAN DIEGO, CA 92111

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jun 1, 2047

November 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	4151 S CASTRO ST, MARTINEZ, CA 94553-3951
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	OLD REPUBLIC TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000204302
Date	Nov 15, 2019
Instrument	2019-204302

Lender

Name	GUILD MORTGAGE CO
Type	Mortgage Company
Address	SAN DIEGO, CA 92111

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Dec 1, 2049

December 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	4151 S CASTRO ST, MARTINEZ, CA 94553-3951
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	OLD REPUBLIC TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4151 S CASTRO ST, MARTINEZ, CA 94553-3951

Mortgage

Document Number	0000313741
Date	Dec 15, 2020
Instrument	2020-313741

Lender

Name	GUILD MORTGAGE CO
Type	Mortgage Company
Address	SAN DIEGO, CA 92111

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jan 1, 2051

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		$694,287 (+2%) Land $492,645 Building $201,642
2025	$8,876.00 (+6.5%) Homeowner's exemption	$680,675 (+4.04%) Land $482,986 Building $197,689
2023	$8,334.00 (+1.68%) Homeowner's exemption	$654,245 Land $464,232 Building $190,013
2022	$8,196.00

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 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 Record median of 109 policies
Nearby Flood Policies	109 in force
Nearby Flood Claims	32 (1980–2019)
Claims Outside the SFHA	3 of 32
Most Recent Claim	Feb 2019
Claims by Event	Severe Storms, Flooding, Mudslides, And Landslides, Jan 2006 · 12 claims Severe Storms, Flooding, Mud And Landslides, Jan 1997 · 5 claims Severe Storms, Flood, Mudslides & High Tide, Jan 1982 · 6 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 43% of the US · lower than 74% of California
Wildfire Likelihood	0.07% 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 212 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
AT&T Fixed Wireless · DSL	100 / 20

May also be available: Astound Broadband, T-Mobile, Unwired, Verizon.

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