4510 Grothman Ln, Martinez, CA 94553 Property Records

Contra Costa County property record for 4510 Grothman Ln, Martinez, CA 94553

Property Summary

Property Type	Single Family Home
Details	1 bd · 1 ba · 1,182 sqft · built 1951
Lot Size	0.46 acres (20,037 sqft)
Owner	Trust Name on File
Last Sale	$625,000 (Jul 2021)
Tax Bill	$9,815 (2025)
Deeds & Mortgages	Jan 2024 Transfer Jul 2021 Sale & Mortgage + 2 more
Flood Zone	Zone AO (high risk)
APN	`162-242-036`

Property Details

APN / Parcel Number

Primary APN	`162-242-036`
Alternative APN	`162-242-036-0`

Interior

Bedrooms	1 Bed
Full Baths	1 Bath
Total Rooms	4 Rooms
Stories	1 Story
Building Area	1,182 sqft Living Area
1st Floor Area	1,182 sqft

Exterior

Year Built	Built 1951
Effective Year Built	Effective 1951
Lot Area	20,037 sqft (0.46 acres)
Garage Type	Attached
Garage Area	300 sqft
Parking Spaces	1 Parking Space

Location & Zoning

Street Address	4510 GROTHMAN LN
City	MARTINEZ
State	CA
Zip	94553-4412
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R110
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	3002
Census Tract	321103

Owner

4510 Grothman Ln is owner-occupied and held in a trust since January 2024.

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

Owner of Record	Trust Name on File
Mailing Address	4510 GROTHMAN LN, MARTINEZ, CA 94553-4412
Occupancy	Owner Occupied
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
Jan 10, 2024	Intrafamily Transfer, Transfer
Jul 9, 2021	Grant Deed, Transfer · Commercial Mortgage THE CHRISTENSEN FAMILY TRUST
Nov 9, 2017	Quit Claim Deed, Transfer Quitclaim
Nov 9, 2017	Quit Claim Deed, Transfer Quitclaim

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jul 9, 2021 · Amount on File
Deed Sale	Jul 9, 2021 · Amount on File
Prior Sale	Nov 20, 1997 · Amount on File
Deed Document Number	2021195752
Last Transfer Date	Jan 8, 2024
Transfer Doc	0000002798
Record Updated	Sep 20, 2026

January 2024: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Jan 10, 2024
Property Address	4510 GROTHMAN LN, MARTINEZ, CA 94553-4412
Document Number	0000002798
Instrument Date	Jan 8, 2024
Instrument	2024-002798
Transaction Type	Transfer
Record Updated	Jan 19, 2024

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
Relationship	Living Trust
Address	4510 GROTHMAN LN, MARTINEZ, CA 94553-4412

July 2021: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Jul 9, 2021
Property Address	4510 GROTHMAN LN, MARTINEZ, CA 94553-4412
Document Number	0000195752
Instrument Date	Jul 1, 2021
Instrument	2021-195752
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	4510 GROTHMAN LN, MARTINEZ, CA 94553-4412

Mortgage

Document Number	0000195753
Date	Jul 9, 2021
Instrument	2021-195753

Lender

Name	THE CHRISTENSEN FAMILY TRUST
Type	Non-Lending Institution

Agreement

Type	Commercial Mortgage
Amount	Amount on Record

November 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Nov 9, 2017
Property Address	4510 GROTHMAN LN, MARTINEZ, CA 94553-4412
Document Number	0000211818
Instrument Date	Nov 7, 2017
Instrument	211818
Transaction Type	Transfer
Record Updated	Nov 14, 2017

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	5019 ALHAMBRA VALLEY RD MARTINEZ CA 945539796, MARTINEZ, CA 94553-9796

November 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Nov 9, 2017
Property Address	4510 GROTHMAN LN, MARTINEZ, CA 94553-4412
Document Number	0000211820
Instrument Date	Nov 7, 2017
Instrument	211820
Transaction Type	Transfer
Record Updated	Nov 14, 2017

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	5019 ALHAMBRA VALLEY RD MARTINEZ CA 945539796, MARTINEZ, CA 94553-9796

Tax Assessment & Valuation

The 2025 property tax bill for 4510 Grothman Ln was $9,815 with a homeowner's exemption.

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		$773,938 (+2%) Land $584,513 Building $189,425
2025	$9,815.00 Homeowner's exemption	$758,763 Land $573,052 Building $185,711
2023	$9,216.00 (+1.68%) Homeowner's exemption	$729,300 Land $550,800 Building $178,500
2022	$9,064.00

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

Flood

FEMA maps place 4510 Grothman Ln 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 27 policies
Nearby Flood Policies	27 in force
Nearby Flood Claims	21 (1982–2023)
Claims Outside the SFHA	3 of 21
Most Recent Claim	Jan 2023 · Severe Winter Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Winter Storms, Flooding, Landslides, And Mudslides, Jan 2023 · 2 claims Severe Storms, Flooding, Mud And Landslides, Jan 1997 · 4 claims Severe Winter Storms, Flooding, Landslides, Mud Flows, Jan 1995 · 4 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 4510 Grothman Ln is high, ranking above 70% of the US, with a 0.3% annual chance of wildfire.

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

Wildfire Risk	High above 70% of the US · above 45% of California
Wildfire Likelihood	0.3% 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.

Cell Coverage

5G (outdoors only) and 4G LTE

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