817 Ada St, San Mateo, CA 94401 Property Records

San Mateo County property record for 817 Ada St, San Mateo, CA 94401

Property Summary

Property Type	Single Family Home
Details	4 bd · 2 ba · 1,760 sqft · built 1950
Lot Size	0.115 acres (5,000 sqft)
Owner	2 Individual Names on Record
Last Sale	$505,000 (Jul 2011)
Tax Bill	$10,067 (2025)
Deeds & Mortgages	Mar 2022 Line of Credit Apr 2021 Mortgage + 3 more
Flood Zone	Zone X (reduced by levee)
APN	`033-335-220`

Property Details

APN / Parcel Number

Primary APN	`033-335-220`

Interior

Bedrooms	4 Beds
Full Baths	2 Baths
Total Rooms	7 Rooms
Building Area	1,760 sqft Living Area
1st Floor Area	1,000 sqft
Family Room	Family Room

Exterior

Year Built	Built 1950
Effective Year Built	Effective 1950
Lot Area	5,000 sqft (0.115 acres)
Lot Dimensions	100 ft deep x 50 ft wide
Garage Area	250 sqft
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	817 ADA ST
City	SAN MATEO
State	CA
Zip	94401-3103
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R10006
Legal Description	LOT 9 BLOCK 11 SHORE VIEW TRACT MAP NO 8 RSM 30/25 26 27 28 CITY OF SAN MATEO
Legal Subdivision	SHORE VIEW TRACT MAP NO 8
Legal Block	11
Legal Lot Number	9
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	2
Census Block	2015
Census Tract	607701

Owner

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

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

Owner of Record	2 Individual Names on Record
Mailing Address	817 ADA ST, SAN MATEO, CA 94401-3103
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Mar 29, 2022	Gift Deed, Transfer · Line of Credit SAN MATEO CU
Apr 5, 2021	Deed of Trust, Mortgage · Conventional Mortgage SAN MATEO CU
Apr 4, 2017	Deed of Trust, Mortgage · ARM WINTRUST MORTGAGE
Nov 6, 2018	Deed of Trust, Mortgage · Line of Credit ALLIANT CU
Feb 15, 2018	Deed of Trust, Mortgage · Line of Credit ALLIANT CU

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Jul 12, 2011 · Amount on Record
Deed Sale	Jul 12, 2011 · Amount on Record
Deed Document Number	201177544
Last Transfer Date	Mar 2, 2022
Transfer Doc	0000026911
Record Updated	Sep 20, 2026

March 2022: Gift Deed, Transfer

Document Type	Gift Deed
Jurisdiction	SAN MATEO CA
Recording Date	Mar 29, 2022
Property Address	817 ADA ST, SAN MATEO, CA 94401-3103
Document Number	0000026911
Map Reference	MB 30 PG 25-28
Instrument Date	Mar 2, 2022
Instrument	2022-026911
Transaction Type	Transfer
Record Updated	Aug 5, 2022
Title Company	CHICAGO 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
Relationship	Community Property with Right of Survivorship
Address	817 ADA ST, SAN MATEO, CA 94401-3103

Mortgage

Document Number	0000026912
Date	Mar 29, 2022
Instrument	2022-026912

Lender

Name	SAN MATEO CU
Type	Credit Union

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	300 Months
Due	Mar 1, 2047

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	817 ADA ST, SAN MATEO, CA 94401-3103
Transaction Type	Mortgage
Record Updated	May 12, 2021
Title Company	OLD REPUBLIC TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	817 ADA ST, SAN MATEO, CA 94401-3103

Mortgage

Document Number	0000054149
Date	Apr 5, 2021
Instrument	2021-054149

Lender

Name	SAN MATEO CU
Type	Credit Union
Address	SAND SPRINGS, OK 74063

Agreement

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

April 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	817 ADA ST, SAN MATEO, CA 94401-3103
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000029567
Date	Apr 4, 2017
Instrument	2017-029567

Lender

Name	WINTRUST MORTGAGE
Type	Mortgage Company
Address	DES PLAINES, IL 60018

Agreement

Type	ARM
Amount	Amount Recorded
Term	360 Months
Due	Apr 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	3.75%
Adjustable	Adjustable Rate Rider
Type Change Date	Apr 1, 2024
Change Frequency	Annually
Min Rate At Change	2.5%
Max Rate At Change	8.75%
Index	1-Year LIBOR
Max Rate	8.75%

November 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	817 ADA ST, SAN MATEO, CA 94401-3103
Document Number	0000001296
Instrument Date	Nov 6, 2018
Transaction Type	Mortgage
Record Updated	Jan 25, 2019
Title Company	FIRST AMERICAN TITLE, FIRST AMERICAN TITLE INSURANCE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	817 ADA ST SAN MATEO CA 944013103, SAN MATEO, CA 94401-3103

Mortgage

Document Number	0000001296
Date	Jan 8, 2019
Instrument	1296

Lender

Name	ALLIANT CU
Type	Credit Union
Address	CHICAGO, IL 60666

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	180 Months
Due	Jan 7, 2034

Interest

Rate Type	Adjustable Rate

February 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	817 ADA ST, SAN MATEO, CA 94401-3103
Document Number	0000015206
Instrument Date	Feb 15, 2018
Transaction Type	Mortgage
Record Updated	Mar 20, 2018
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	817 ADA ST SAN MATEO CA 944013103, SAN MATEO, CA 94401-3103

Mortgage

Document Number	0000015206
Date	Mar 2, 2018
Instrument	15206

Lender

Name	ALLIANT CU
Type	Credit Union
Address	CHICAGO, IL 60666

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	180 Months
Due	Mar 1, 2033

Interest

Rate Type	Adjustable Rate

Tax Assessment & Valuation

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		$646,982 (+2%) Land $323,491 Building $323,491
2025	$10,067.00 (+1%)	$634,298 (+4.04%) Land $317,149 Building $317,149
2023	$9,152.00 (-1.39%)	$609,670 Land $304,835 Building $304,835	$843,930
2022	$9,281.00

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

Flood

Source: FEMA National Flood Hazard Layer, effective September 10, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X reduced by levee · depends on levee performance
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 12 policies
Nearby Flood Policies	12 in force
Nearby Flood Claims	6 (1978–2004)
Most Recent Claim	Nov 2004
Claims by Event	Severe Storms, Flood, Mudslides & High Tide, Jan 1982 · 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

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

Wildfire Risk	Not rated no burnable land within 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 697 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
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	1,000 / 75
Unwired Fixed Wireless	300 / 25
Etheric Networks Fixed Wireless	250 / 100
T-Mobile Fixed Wireless	100 / 20

May also be available: GeoLinks, Sonic Telecom.

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