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523 State St, San Mateo, CA 94401 Property Records

San Mateo County property record for 523 State St, San Mateo, CA 94401

Property Summary

Property TypeDuplex
Details4 bd · 6 ba · 4,382 sqft · built 1948
Lot Size0.161 acres (6,996 sqft)
Owner2 Company Names on File
Last Sale$405,000 (Jan 1995)
Tax Bill$11,938 (2025)
Deeds & MortgagesNov 2020 Transfer
Nov 2020 Transfer
Flood ZoneZone X (minimal risk)
APN032-133-180

Property Details

APN / Parcel Number

Primary APN032-133-180

Interior

Bedrooms4 Beds
Full Baths6 Baths
Total Rooms12 Rooms
Units4 Units
Stories2 Stories
Building Area4,382 sqft Living Area

Exterior

Year BuiltBuilt 1948
Effective Year BuiltEffective 1948
Architectural StyleDuplex Single
Roof MaterialComposition Shingle
Lot Area6,996 sqft (0.161 acres)
Lot Dimensions140 ft deep x 50 ft wide
View / LotCorner
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Heating SystemFloor/Wall Furnace

Location & Zoning

Street Address523 STATE ST
CitySAN MATEO
StateCA
Zip94401-1613
Property CategoryResidential
Property TypeResidential > Multi-Unit > Duplex
Local Zoning CodeRM0000
Legal DescriptionLOT 42 STUDIO TRACT RSM 16/36 37 38
Legal SubdivisionSTUDIO TRACT
Legal Tract2
Legal Lot Number42
JurisdictionSAN MATEO CA
Township / Civil DivisionSAN MATEO
Census Block Group1
Census Block1000
Census Tract606000

Owner

Source: San Mateo County records · APN 032-133-180

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 Record2 Company Names on File
Mailing Address250 GREEN HILLS DR, MILLBRAE, CA 94030-1700
Owner TypeCompany
VestingTrust

Deeds, Mortgages & Sale History

DateDocument
Nov 19, 2020Affidavit of Death, Transfer
ATTORNEY ONLY
Nov 19, 2020Quit Claim Deed, Transfer
ATTORNEY ONLY

Assessor's Deed Record

Deed Names2 Verified Names on Deed
Last SaleJan 25, 1995 · Amount on Record
Deed SaleJan 25, 1995 · Amount on Record
Prior SaleJan 10, 1995 · Amount on Record
Deed Document Number19957771
Last Transfer DateOct 17, 2020
Transfer Doc0000131188
Record UpdatedSep 20, 2026

November 2020: Affidavit of Death, Transfer

Document TypeAffidavit of Death
JurisdictionSAN MATEO CA
Recording DateNov 19, 2020
Property Address523 STATE ST, SAN MATEO, CA 94401-1613
Document Number0000131187
Instrument DateOct 17, 2020
Instrument131187
Transaction TypeTransfer
Record UpdatedDec 22, 2020
Title CompanyATTORNEY ONLY

Transaction

Tax$0.00
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address523 STATE ST SAN MATEO CA 944011613, SAN MATEO, CA 94401-1613

November 2020: Quit Claim Deed, Transfer

Document TypeQuit Claim Deed
JurisdictionSAN MATEO CA
Recording DateNov 19, 2020
Property Address523 STATE ST, SAN MATEO, CA 94401-1613
Document Number0000131188
Instrument DateOct 17, 2020
Instrument131188
Transaction TypeTransfer
Record UpdatedDec 22, 2020
Title CompanyATTORNEY ONLY

Transaction

Tax$0.00
Additional
  • Quitclaim
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipPersonal Trust
Address250 GREEN HILLS DR MILLBRAE CA 940301700, MILLBRAE, CA 94030-1700

Tax Assessment & Valuation

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

Property Jurisdictions

TypeName
StateCalifornia
CountySan Mateo County
MunicipalitySan Mateo City
Elementary School DistrictSan Mateo-Foster City Elementary School District (KG - 08)
Secondary School DistrictSan Mateo Union High School District (09 - 12)

Tax Bill & Assessment History

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

YearTax BillAssessed Value
2026$693,856 (+2%) Land $208,148 Building $485,708
2025$11,938.00 (+18.02%)$680,252 (+4.04%) Land $204,067 Building $476,185
2023$10,115.00 (-0.77%)$653,840 Land $196,144 Building $457,696
2022$10,193.00

Flood & Wildfire

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

Flood

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it

Wildfire

Wildfire RiskNot rated
no burnable land within ember reach

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

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

ProviderMax Down / Up (Mbps)
AT&T
Fiber · DSL · Fixed Wireless in parts of the area		5,000 / 5,000
Xfinity
Cable · Fiber in parts of the area		2,000 / 250
Radiate Holdings
Cable		1,500 / 50
Verizon
Fixed Wireless		1,000 / 75
Etheric Communications, LLC.
Fixed Wireless		250 / 100
T-Mobile USA
Fixed Wireless		100 / 20

May also be available: California Internet, Sonic Telecom, Unwired.

Based on FCC filings for 803 locations within half a mile of this property.

Drinking Water

Source: EPA Safe Drinking Water Information System, water system CA4110008, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water SystemCALIFORNIA WATER SERVICE - SAN MATEO
private · serves 103,536 people
Water SourcePurchased surface water from SAN FRANCISCO REGIONAL WATER SYSTEM
Last State InspectionMar 2025
Lead4 ppb (2023–2025)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
last 3 years

Results are for the whole water system as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.

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