421 Williams Pl, San Mateo, CA 94401 Property Records

San Mateo County property record for 421 Williams Pl, San Mateo, CA 94401 · Last verified July 2026

Property Summary

Property Type	Single Family Home
Details	2 bd · 1 ba · 740 sqft · built 1929
Lot Size	0.067 acres (2,933 sqft)
Owner	2 Company Names on File
Last Sale	$840,000 (Oct 2014)
Tax Bill	$13,176 (2025)
Deeds & Mortgages	May 2020 Mortgage Mar 2018 Transfer
Flood Zone	Zone X (minimal risk)
APN	`032-173-170`

Property Details

APN / Parcel Number

Primary APN	`032-173-170`

Interior

Bedrooms	2 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	740 sqft Living Area
1st Floor Area	740 sqft
Family Room	Family Room

Exterior

Year Built	Built 1929
Effective Year Built	Effective 1929
Lot Area	2,933 sqft (0.067 acres)
Lot Dimensions	63 ft deep x 47 ft wide
View / Lot	Corner
Garage Area	140 sqft
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	421 WILLIAMS PL
City	SAN MATEO
State	CA
Zip	94401-2419
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 20 ALBERT A MEYER SUB POR BLK 8 OF WESTERN ADD SAN MATEO RSM 16/7
Legal Subdivision	WESTERN ADD SAN MATEO
Legal Block	8
Legal Lot Number	20
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	3
Census Block	3003
Census Tract	605901

Owner

Source: San Mateo County records · APN 032-173-170

Assessment roll updated July 15, 2026 · Last verified July 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Company Names on File
Mailing Address	421 WILLIAMS PL, SAN MATEO, CA 94401-2419
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
May 13, 2020	Deed of Trust, Mortgage · Conventional Mortgage LOANDEPOT.COM LLC
Mar 19, 2018	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	Oct 10, 2014 · Amount on Record
Deed Sale	Oct 10, 2014 · Amount on Record
Prior Sale	Sep 29, 2000 · Amount on Record
Deed Document Number	201492718
Last Transfer Date	Jan 04, 2018
Transfer Doc	0000020313
Record Updated	Sep 20, 2026

May 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	421 WILLIAMS PL, SAN MATEO, CA 94401-2419
Document Number	0000045577
Instrument Date	May 13, 2020
Transaction Type	Mortgage
Record Updated	Jun 09, 2020
Title Company	NOT AVAILABLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	421 WILLIAMS PL SAN MATEO CA 944012419, SAN MATEO, CA 94401-2419

Mortgage

Document Number	0000045577
Date	May 19, 2020
Instrument	45577

Lender

Name	LOANDEPOT.COM LLC
Type	Funding / Finance Company
Address	FOOTHILL RANCH, CA 92610

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	May 18, 2050

March 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SAN MATEO CA
Recording Date	Mar 19, 2018
Property Address	421 WILLIAMS PL, SAN MATEO, CA 94401-2419
Document Number	0000020313
Instrument Date	Feb 20, 2018
Instrument	20313
Transaction Type	Transfer
Record Updated	Apr 10, 2018
Title Company	ATTORNEY ONLY

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	421 WILLIAMS PL SAN MATEO CA 944012419, SAN MATEO, CA 94401-2419

Tax Assessment & Valuation

Source: San Mateo County records · Assessment roll updated July 15, 2026 · Last verified July 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

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

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$1,029,736 (+2%) Land $514,868 Building $514,868
2025	$13,176.00 (+5.09%)	$1,009,546 (+4.04%) Land $504,773 Building $504,773
2023	$12,538.00 (+1.54%)	$970,346 Land $485,173 Building $485,173	$899,280
2022	$12,348.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, San Mateo County (06081C), updated September 10, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X
Special Flood Hazard Area	No
Flood Hazard	Minimal
500-Year Floodplain	No

Wildfire

Wildfire Risk	Not rated no burnable land in reach
Wildfire Likelihood	Negligible
Exposure	None beyond ember reach

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

Internet Providers

Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 694 locations within about half a mile of this property

Provider	Technology	Download / Upload (Mbps)
AT&T	Fiber	5,000 / 5,000
Xfinity	Cable	2,000 / 250
Radiate Holdings	Cable	1,500 / 50
Sonic Telecom	Fiber	1,000 / 1,000
Verizon	Fixed Wireless	1,000 / 75
Etheric Communications, LLC.	Fixed Wireless (licensed-by-rule)	250 / 100

May also be available at this address: Unwired, AT&T, T-Mobile USA, California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.

Mobile Coverage

5G and 4G LTE

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