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140 23rd Ave, San Mateo, CA 94403 Property Records

San Mateo County property record for 140 23rd Ave, San Mateo, CA 94403

Property Summary

Property TypeSingle Family Home
Details2 bd · 1.5 ba · 2,010 sqft · built 1939
Lot Size0.155 acres (6,750 sqft)
Owner2 Company Names on Record
Last Sale$2,095,000 (Feb 2025)
Tax Bill$21,921 (2025)
Deeds & MortgagesAug 2020 Sale & Mortgage
Flood ZoneZone X (minimal risk)
APN039-151-170

Property Details

APN / Parcel Number

Primary APN039-151-170

Interior

Bedrooms2 Beds
Full Baths1.5 Baths
Half Baths1 Half Bath
Total Rooms8 Rooms
Stories1 Story
Building Area2,010 sqft Living Area
1st Floor Area1,100 sqft
Basement Area500 sqft
Finished Basement500 sqft
Family RoomFamily Room
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1939
Effective Year BuiltEffective 1939
Lot Area6,750 sqft (0.155 acres)
Lot Dimensions135 ft deep x 50 ft wide
Garage TypeBasement
Parking Spaces1 Parking Space

Utilities, Heating & Cooling

Cooling SystemCentral
Heating SystemCentral

Location & Zoning

Street Address140 23RD AVE
CitySAN MATEO
StateCA
Zip94403-2204
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning CodeR20000
Legal DescriptionLOT 13 BLOCK 3 SAN MATEO VILLA PARK RSM 12/50 51 CITY OF SAN MATEO
Legal SubdivisionSAN MATEO VILLA PARK
Legal Block3
Legal Lot Number13
JurisdictionSAN MATEO CA
Township / Civil DivisionSAN MATEO
Census Block Group1
Census Block1010
Census Tract607400

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 Record2 Company Names on Record
Mailing Address140 23RD AVE, SAN MATEO, CA 94403-2204
OccupancyOwner Occupied
Owner TypeCompany
VestingTrust, Revocable Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleFeb 26, 2025 · Amount on Record
Deed SaleFeb 26, 2025 · Amount on Record
Prior SaleAug 21, 2020 · Amount on Record
Deed Document Number20258669
Transfer Doc0000099717
Record UpdatedOct 29, 2026

August 2020: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionSAN MATEO CA
Recording DateAug 21, 2020
Property Address140 23RD AVE, SAN MATEO, CA 94403-2204
Document Number0000083798
Map ReferenceMB 12 PG 50&51
Instrument DateAug 14, 2020
Instrument2020-083798
Transaction TypeTransfer
Record UpdatedAug 9, 2021
Title CompanyFIRST AMERICAN TITLE COMPANY

Transaction

AmountAmount Recorded
DownpaymentDownpayment on Record
Loan-to-Value (LTV)LTV on Record
Tax$0.00
Amount AccuracyRounded by County
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipCommunity Property with Right of Survivorship
Address140 23RD AVE, SAN MATEO, CA 94403-2204

Mortgage

Document Number0000083799
DateAug 21, 2020
Instrument2020-083799
Lender
NameWELLS FARGO BANK NA
TypeBank
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term361 Months
DueSep 1, 2050

Tax Assessment & Valuation

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

YearTax BillAssessed ValueAssessed Market Value
2026$2,136,900 (+19.5%) Land $1,499,400 Building $637,500
2025$21,921.00 (+0.11%) Homeowner's exemption$1,788,176 (+4.04%) Land $1,082,432 Building $705,744
2023$21,896.00 (+4.02%) Homeowner's exemption$1,718,740 Land $1,040,400 Building $678,340$1,958,850
2022$21,050.00

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 ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Nearby Flood Policies1 in force

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 RiskNot 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 SystemCALIFORNIA WATER SERVICE - SAN MATEO
private · serves 103,536 people · EPA ID CA4110008
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, 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 423 locations within half a mile, as of December 31, 2025

ProviderMax 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
Etheric Networks
Fixed Wireless		250 / 100
T-Mobile
Fixed Wireless		100 / 20

May also be available: GeoLinks, Verizon.

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