623 Sylvan Ave, San Mateo, CA 94403 Property Records

San Mateo County property record for 623 Sylvan Ave, San Mateo, CA 94403

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,340 sqft · built 1949
Lot Size	0.153 acres (6,675 sqft)
Owner	2 Individual Names on File
Last Sale	$1,470,000 (Mar 2018)
Tax Bill	$22,958 (2025)
Deeds & Mortgages	Aug 2026 Line of Credit Feb 2019 Line of Credit + 3 more
Flood Zone	Zone X (minimal risk)
APN	`039-303-020`

Property Details

APN / Parcel Number

Primary APN	`039-303-020`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	6 Rooms
Stories	1 Story
Building Area	1,340 sqft Living Area
1st Floor Area	1,340 sqft
Family Room	Family Room
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1949
Effective Year Built	Effective 1949
Architectural Style	Ranch
Exterior Material	Stucco
Construction Type	Frame
Roof Material	Composition Shingle
Lot Area	6,675 sqft (0.153 acres)
Lot Dimensions	111 ft deep x 60 ft wide
Garage Area	420 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	623 SYLVAN AVE
City	SAN MATEO
State	CA
Zip	94403-3215
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R10006
Legal Description	LOT 11 BLOCK 23 SAN MATEO TERRACE MAP NO 7 RSM 23/70 CITY OFSAN MATEO
Legal Subdivision	SAN MATEO TERRACE MAP NO 7
Legal Block	23
Legal Lot Number	11
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	3
Census Block	3001
Census Tract	607300

Owner

623 Sylvan Ave is owned and occupied by two individuals who bought it in March 2018.

Source: San Mateo County records, as of September 22, 2026

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	2 Individual Names on File
Mailing Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Aug 20, 2026	Deed of Trust, Mortgage · Line of Credit STANFORD FEDERAL CREDIT UNION
Feb 12, 2019	Deed of Trust, Mortgage · Line of Credit WELLS FARGO BANK NA
Mar 8, 2021	Deed of Trust, Mortgage · Conventional Mortgage WELLS FARGO BANK NA
Mar 23, 2018	Grant Deed, Transfer · Conventional Mortgage WELLS FARGO BANK NA
Apr 14, 2017	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 23, 2018 · Amount on File
Deed Sale	Mar 23, 2018 · Amount on File
Prior Sale	May 3, 2004 · Amount on File
Deed Document Number	201821993
Prior Transfer Date	Apr 19, 2000
Prior Transfer Doc	0000090736
Record Updated	Oct 29, 2026

August 2026: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Recording Date	Aug 20, 2026
Property Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215
Document Number	0000047192
Instrument Date	Aug 7, 2026
Instrument	202647192
Transaction Type	Mortgage
Record Updated	Sep 22, 2026
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215

Mortgage

Document Number	0000047192,
Date	Aug 20, 2026
Instrument	202647192

Lender

Name	STANFORD FEDERAL CREDIT UNION

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	360 Months
Due	Aug 15, 2056

Interest

Max Rate	-1%

February 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215
Transaction Type	Mortgage
Record Updated	Oct 18, 2022

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000009353
Date	Feb 12, 2019
Instrument	2019-009353

Lender

Name	WELLS FARGO BANK NA
Type	Bank
Address	SIOUX FALLS, SD 57104

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	360 Months
Due	Feb 12, 2049

March 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215
Transaction Type	Mortgage
Record Updated	Oct 18, 2022
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215

Mortgage

Document Number	0000037276
Date	Mar 8, 2021
Instrument	2021-037276

Lender

Name	WELLS FARGO BANK NA
Type	Bank
Address	SIOUX FALLS, SD 57104

Agreement

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

March 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Mar 23, 2018
Property Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215
Document Number	0000021993
Map Reference	MB23 PG70
Instrument Date	Mar 6, 2018
Instrument	2018-021993
Transaction Type	Transfer
Record Updated	Oct 18, 2022
Title Company	LAWYERS TITLE CO

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
Address	CA 00000

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Right of Survivorship
Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215

Mortgage

Document Number	0000021994
Date	Mar 23, 2018
Instrument	2018-021994

Lender

Name	WELLS FARGO BANK NA
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Apr 1, 2048

April 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SAN MATEO CA
Recording Date	Apr 14, 2017
Property Address	623 SYLVAN AVE, SAN MATEO, CA 94403-3215
Document Number	0000033059
Instrument Date	Feb 21, 2017
Instrument	33059
Transaction Type	Transfer
Record Updated	May 5, 2017
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	Tenants in Common
Address	623 SYLVAN AVE SAN MATEO CA 944033215, SAN MATEO, CA 94403-3215

Tax Assessment & Valuation

The 2025 property tax bill for 623 Sylvan Ave was $22,958.

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		$1,914,961 (+2%) Land $1,508,759 Building $406,202
2025	$22,958.00	$1,877,414 Land $1,479,176 Building $398,238
2023	$22,099.00 (+0.9%)	$1,804,514 Land $1,421,739 Building $382,775	$1,744,020
2022	$21,901.00

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

Flood

FEMA maps place 623 Sylvan Ave in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 2009.

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 minimal risk
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Policies	2 in force
Nearby Flood Claims	2 (2009–2017)
Claims Outside the SFHA	2 of 2
Most Recent Claim	Jan 2017 · Severe Winter Storms, Flooding, And Mudslides

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

The area around 623 Sylvan Ave has no burnable land within ember reach, so its wildfire risk is not rated.

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 732 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 · Fiber in parts of the area	1,500 / 50

May also be available: Etheric Networks, T-Mobile.

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