San Mateo County property record for 812 31st Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,440 sqft · built 1951 |
| Lot Size | 0.17 acres (7,393 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $300,000 (Nov 1995) |
| Tax Bill | $8,534 (2025) |
| Deeds & Mortgages | Aug 2018 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-191-250 |
| Primary APN | 039-191-250 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,440 sqft Living Area |
| 1st Floor Area | 1,050 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1951 |
|---|---|
| Effective Year Built | Effective 1951 |
| Lot Area | 7,393 sqft (0.17 acres) |
| Lot Dimensions | 108 ft deep x 64 ft wide |
| Garage Area | 271 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 812 31ST AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-3818 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 22 BLOCK 8 HILLSDALE UNIT NO 4A RSM 31/10 11 CITY OF SANMATEO |
| Legal Subdivision | HILLSDALE UNIT NO 4A |
| Legal Block | 8 |
| Legal Lot Number | 22 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1008 |
| Census Tract | 607300 |
812 31st Ave is owner-occupied and held in a trust since July 2018.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 812 31ST AVE, SAN MATEO, CA 94403-3818 |
| 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 Sale | Nov 22, 1995 · Amount on File |
| Deed Sale | Nov 22, 1995 · Amount on File |
| Deed Document Number | 1995125582 |
| Last Transfer Date | Jul 31, 2018 |
| Transfer Doc | 0000063204 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Aug 13, 2018 |
| Property Address | 812 31ST AVE, SAN MATEO, CA 94403-3818 |
| Document Number | 0000063204 |
| Instrument Date | Jul 31, 2018 |
| Instrument | 63204 |
| Transaction Type | Transfer |
| Record Updated | Aug 30, 2018 |
| Title Company | ATTORNEY ONLY |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Living Trust |
| Address | 812 31ST AVE SAN MATEO CA 944033818, SAN MATEO, CA 94403-3818 |
The 2025 property tax bill for 812 31st Ave was $8,534 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 | $529,739 (+2%) Land $254,160 Building $275,579 | ||
| 2025 | $8,534.00 Homeowner's exemption | $519,354 Land $249,177 Building $270,177 | |
| 2023 | $8,158.00 (+0.8%) Homeowner's exemption | $499,191 Land $239,502 Building $259,689 | $1,350,180 |
| 2022 | $8,093.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 812 31st Ave in Zone X, an area of minimal flood risk, though there have been 3 flood claims nearby since 1983.
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 | 4 in force |
| Nearby Flood Claims | 3 (1983–2016) |
| Claims Outside the SFHA | 3 of 3 |
| Most Recent Claim | Mar 2016 · other causes |
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 risk around 812 31st 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 732 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 · Fiber in parts of the area | 1,500 / 50 |
May also be available: Etheric Networks, T-Mobile.
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