San Mateo County property record for 490 23rd Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 2 ba · 1,810 sqft · built 1950 |
| Lot Size | 0.162 acres (7,061 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $3,533 (2025) |
| Deeds & Mortgages | May 2026 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-131-390 |
| Primary APN | 039-131-390 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Building Area | 1,810 sqft Living Area |
| 1st Floor Area | 1,810 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 1950 |
|---|---|
| Effective Year Built | Effective 1950 |
| Lot Area | 7,061 sqft (0.162 acres) |
| Lot Dimensions | 141 ft deep x 50 ft wide |
| Garage Area | 830 sqft |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 490 23RD AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-2242 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R106 |
| Legal Description | 50 FT X 141.13 FT ON 23RD AVE COM NELY 100 FT FRM LINE DIVIDING LOTS 7 & 8 PTN OF LOT 7 BLOCK 7 SAN MATEO VILLA PARK RSM 12/50 51 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO VILLA PARK |
| Legal Block | 7 |
| Legal Lot Number | 7,8 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1008 |
| Census Tract | 607400 |
490 23rd Ave is owned by an individual who acquired it in January 2010.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 821 CATALINA BLVD, SAN DIEGO, CA 92106-2836 |
| Owner Type | Individual |
| Vesting | Single Woman |
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 | Name on Deed |
|---|---|
| Last Sale | Jan 21, 2010 |
| Deed Sale | Jan 21, 2010 |
| Prior Sale | Jan 21, 2010 |
| Deed Document Number | 20106566 |
| Prior Transfer Date | Aug 8, 1994 |
| Prior Transfer Doc | 0000152817 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | May 19, 2026 |
| Property Address | 490 23RD AVE, SAN MATEO, CA 94403-2242 |
| Document Number | 0000028597 |
| Instrument Date | May 14, 2026 |
| Instrument | 202628597 |
| Transaction Type | Mortgage |
| Record Updated | Jul 12, 2026 |
| Title Company | FIDELITY NATIONAL TITLE |
| Name | Verified Name |
|---|---|
| Address | 821 CATALINA BLVD, SAN DIEGO, CA 92106-2836 |
| Document Number | 0000028597, |
|---|---|
| Date | May 19, 2026 |
| Instrument | 202628597 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Jun 1, 2056 |
| Rate Type | Fixed Rate |
|---|---|
| Rate | 6.3% |
| Initial Type | Fixed Rate |
| Max Rate | -1% |
The 2025 property tax bill for 490 23rd Ave was $3,533.
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 | $139,162 (+2%) Land $38,619 Building $100,543 | ||
| 2025 | $3,533.00 Homeowner's exemption | $136,434 Land $37,862 Building $98,572 | |
| 2023 | $3,364.00 (+9.08%) Homeowner's exemption | $131,139 Land $36,393 Building $94,746 | $2,358,900 |
| 2022 | $3,084.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 490 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 490 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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