San Mateo County property record for 316 23rd Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 1,090 sqft · built 1951 |
| Lot Size | 0.155 acres (6,750 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $497,000 (Sep 2001) |
| Tax Bill | $10,693 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-141-360 |
| Primary APN | 039-141-360 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Building Area | 1,090 sqft Living Area |
| 1st Floor Area | 1,090 sqft |
| Family Room | Family Room |
| Year Built | Built 1951 |
|---|---|
| Effective Year Built | Effective 1951 |
| Lot Area | 6,750 sqft (0.155 acres) |
| Lot Dimensions | 135 ft deep x 50 ft wide |
| Garage Area | 270 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 316 23RD AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-2240 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | W 1/2 OF LOT 14 BLOCK 5 SAN MATEO VILLA PARK RSM 12/50 51 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO VILLA PARK |
| Legal Block | 5 |
| Legal Lot Number | 14 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1009 |
| Census Tract | 607400 |
316 23rd Ave is owned and occupied by two individuals who bought it in September 2001.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 316 23RD AVE, SAN MATEO, CA 94403-2240 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Sep 18, 2001 · Amount on File |
| Deed Sale | Sep 18, 2001 · Amount on File |
| Deed Document Number | 2001146466 |
| Prior Transfer Date | Sep 14, 2001 |
| Prior Transfer Doc | 0000146464 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 316 23rd Ave was $10,693 with a homeowner's exemption.
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 | $748,884 (+2%) Land $374,442 Building $374,442 | ||
| 2025 | $10,693.00 Homeowner's exemption | $734,200 Land $367,100 Building $367,100 | |
| 2023 | $10,315.00 (-0.22%) Homeowner's exemption | $705,692 Land $352,846 Building $352,846 | $1,592,370 |
| 2022 | $10,338.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 316 23rd Ave in Zone X, an area of minimal flood risk.
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.
The area around 316 23rd 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.
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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