San Mateo County property record for 261 42nd Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 1,700 sqft · built 1956 |
| Lot Size | 0.258 acres (11,250 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $3,498 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 042-251-020 |
| Primary APN | 042-251-020 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,700 sqft Living Area |
| Gross Area | 2,180 sqft |
| 1st Floor Area | 1,440 sqft |
| Basement Area | 740 sqft |
| Finished Basement | 260 sqft |
| Unfinished Basement | 480 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1956 |
|---|---|
| Effective Year Built | Effective 1956 |
| Architectural Style | Ranch |
| Exterior Material | Wood |
| Construction Type | Wood |
| Roof Material | Composition Shingle |
| Lot Area | 11,250 sqft (0.258 acres) |
| Lot Dimensions | 212 ft deep x 53 ft wide |
| Garage Type | Basement |
| Garage Area | 480 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 261 42ND AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-5001 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 22 BLOCK 25 SAN MATEO KNOLLS MAP NO 2 RSM 24/61 62 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO KNOLLS MAP NO 2 |
| Legal Block | 25 |
| Legal Lot Number | 22 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2006 |
| Census Tract | 607100 |
261 42nd Ave is owner-occupied and held in a trust since July 2003.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 261 42ND AVE, SAN MATEO, CA 94403-5001 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
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 Transfer Date | Jul 22, 2003 |
| Transfer Doc | 0000080992 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 261 42nd Ave was $3,498 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 | $138,121 (+2%) Land $34,935 Building $103,186 | ||
| 2025 | $3,498.00 Homeowner's exemption | $135,413 Land $34,250 Building $101,163 | |
| 2023 | $3,316.00 (+5.98%) Homeowner's exemption | $130,157 Land $32,921 Building $97,236 | $1,856,250 |
| 2022 | $3,129.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 261 42nd Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 10, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 261 42nd Ave is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.1% of the US · lower than 99.2% of California |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond 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 785 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 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
May also be available: GeoLinks, T-Mobile.
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