253 42nd Ave, San Mateo, CA 94403 Property Records

San Mateo County property record for 253 42nd Ave, San Mateo, CA 94403

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 1,700 sqft · built 1956
Lot Size	0.297 acres (12,936 sqft)
Owner	2 Trust Names on File
Last Sale	$2,010,000 (Mar 2021)
Tax Bill	$24,538 (2025)
Deeds & Mortgages	Jan 2022 Transfer Mar 2021 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`042-251-040`

Property Details

APN / Parcel Number

Primary APN	`042-251-040`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	7 Rooms
Stories	1 Story
Building Area	1,700 sqft Living Area
Gross Area	2,180 sqft
1st Floor Area	1,440 sqft
Basement Area	740 sqft
Finished Basement	260 sqft
Unfinished Basement	480 sqft
Family Room	Family Room

Exterior

Year Built	Built 1956
Effective Year Built	Effective 1956
Lot Area	12,936 sqft (0.297 acres)
Lot Dimensions	205 ft deep x 62 ft wide
Garage Type	Basement
Garage Area	480 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	253 42ND AVE
City	SAN MATEO
State	CA
Zip	94403-5001
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R10006
Legal Description	65.06 FT X 62.42 FT F & R MEAS BEING WLY PTN OF LOT 20 BLOCK 25 SAN MATEO KNOLLS MAP NO 2 RSM 24/61 62 CITY OF SAN MATEO
Legal Subdivision	SAN MATEO KNOLLS MAP NO 2
Legal Block	25
Legal Lot Number	20
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	2
Census Block	2006
Census Tract	607100

Owner

253 42nd Ave is owner-occupied and held in a trust since March 2021.

Source: San Mateo County records, as of July 15, 2026

Owner of Record	2 Trust Names on File
Mailing Address	253 42ND AVE, SAN MATEO, CA 94403-5001
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 31, 2022	Intrafamily Transfer, Transfer
Mar 9, 2021	Grant Deed, Transfer · Conventional Mortgage JPMORGAN CHASE BANK NA

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 9, 2021 · Amount on File
Deed Sale	Mar 9, 2021 · Amount on File
Prior Sale	Apr 5, 2013 · Amount on File
Deed Document Number	202138025
Prior Transfer Date	Mar 24, 1994
Prior Transfer Doc	0000129275
Record Updated	Oct 29, 2026

January 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Jan 31, 2022
Property Address	253 42ND AVE, SAN MATEO, CA 94403-5001
Document Number	0000008817
Map Reference	MB 24 PG 60-62
Instrument Date	Dec 17, 2021
Instrument	2022-008817
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
Relationship	Family Trust
Address	253 42ND AVE, SAN MATEO, CA 94403-5001

March 2021: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Mar 9, 2021
Property Address	253 42ND AVE, SAN MATEO, CA 94403-5001
Document Number	0000038025
Map Reference	MB 24 PG 60-62
Instrument Date	Feb 28, 2021
Instrument	2021-038025
Transaction Type	Transfer
Record Updated	Aug 9, 2021
Title Company	FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$12,261.00
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	253 42ND AVE, SAN MATEO, CA 94403-5001

Mortgage

Document Number	0000038026
Date	Mar 9, 2021
Instrument	2021-038026

Lender

Name	JPMORGAN CHASE BANK NA
Type	Bank

Agreement

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

Tax Assessment & Valuation

The 2025 property tax bill for 253 42nd Ave was $24,538 with a homeowner's exemption.

Source: San Mateo County assessment roll, as of July 15, 2026

Property Jurisdictions

Type	Name
State	California
County	San Mateo County
Municipality	San Mateo City
Elementary School District	San Mateo-Foster City Elementary School District (KG - 08)
Secondary School District	San Mateo Union High School District (09 - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$1,715,000 (-14.25%) Land $947,000 Building $768,000
2025	$24,538.00 Homeowner's exemption	$2,000,000 Land $1,104,000 Building $896,000
2023	$24,324.00 (-3.21%) Homeowner's exemption	$2,091,204 Land $1,154,844 Building $936,360	$1,856,250
2022	$25,131.00

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 253 42nd Ave in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective September 10, 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

Wildfire risk around 253 42nd Ave is low, with less than a 0.01% annual chance of wildfire.

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

Wildfire Risk	Low lower than 99.1% of the US · lower than 99.2% of California
Wildfire Likelihood	Under 0.01% annual chance
Exposure	None beyond 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	CALIFORNIA WATER SERVICE - SAN MATEO private · serves 103,536 people · EPA ID CA4110008
Water Source	Purchased surface water from SAN FRANCISCO REGIONAL WATER SYSTEM
Last State Inspection	Mar 2025
Lead	4 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 785 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Sonic Telecom Fiber	10,000 / 10,000
AT&T Fiber · Fixed Wireless, DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Astound Broadband Cable	1,500 / 50
Verizon Fixed Wireless	300 / 20
Etheric Networks Fixed Wireless	250 / 100

May also be available: GeoLinks, T-Mobile.

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