San Mateo County property record for 331 23rd Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 4.5 ba · 2,080 sqft · built 1936 |
| Lot Size | 0.153 acres (6,650 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $1,137,000 (Nov 2016) |
| Tax Bill | $25,064 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-142-040 |
| Primary APN | 039-142-040 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 4.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 2,080 sqft Living Area |
| 1st Floor Area | 1,150 sqft |
| Family Room | Family Room |
| Year Built | Built 1936 |
|---|---|
| Effective Year Built | Effective 1936 |
| Lot Area | 6,650 sqft (0.153 acres) |
| Lot Dimensions | 133 ft deep x 50 ft wide |
| Garage Area | 350 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 331 23RD AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-2239 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | SWLY 1/2 OF LOT 8 BLOCK 6 SAN MATEO VILLA PARK RSM 12/50 51 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO VILLA PARK |
| Legal Block | 6 |
| Legal Lot Number | 8 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2002 |
| Census Tract | 607400 |
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 | 313 W 25TH AVE, SAN MATEO, CA 94403-2211 |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Nov 28, 2016 · Amount on Record |
| Deed Sale | Nov 28, 2016 · Amount on Record |
| Deed Document Number | 2016124172 |
| Prior Transfer Date | Nov 10, 2007 |
| Prior Transfer Doc | 0000023731 |
| Record Updated | Sep 20, 2026 |
Source: San Mateo County assessment roll, as of July 15, 2026
| 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) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $2,103,943 (+2%) Land $1,183,795 Building $920,148 | ||
| 2025 | $25,064.00 (+17.96%) | $2,062,691 (+17.62%) Land $1,160,584 Building $902,107 | |
| 2023 | $21,248.00 (+36.84%) | $1,753,632 Land $1,115,518 Building $638,114 | $2,758,410 |
| 2022 | $15,528.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 | 1 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.
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.
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 |
| 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.
Source: FCC Broadband Data Collection, based on 799 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 | 1,500 / 50 |
May also be available: Etheric Networks, GeoLinks, T-Mobile, Verizon.
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