San Mateo County property record for 520 31st Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 2 ba · 1,470 sqft · built 1950 |
| Lot Size | 0.128 acres (5,563 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $6,048 (2025) |
| Deeds & Mortgages | Sep 2017 Transfer Sep 2017 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-303-260 |
| Primary APN | 039-303-260 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,470 sqft Living Area |
| 1st Floor Area | 1,390 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1950 |
|---|---|
| Effective Year Built | Effective 1950 |
| Architectural Style | Ranch |
| Exterior Material | Stucco |
| Roof Material | Composition Shingle |
| Lot Area | 5,563 sqft (0.128 acres) |
| Lot Dimensions | 111 ft deep x 50 ft wide |
| Garage Area | 620 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 520 31ST AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-3813 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 23 BLOCK 18 SAN MATEO TERRACE MAP NO 5 RSM 22/35 CITY OFSAN MATEO |
| Legal Subdivision | SAN MATEO TERRACE MAP NO 5 |
| Legal Block | 18 |
| Legal Lot Number | 23 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3001 |
| Census Tract | 607300 |
520 31st Ave is held in a trust since September 2017.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 520 31ST AVE, SAN MATEO, CA 94403-3813 |
| 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.
| Date | Document |
|---|---|
| Sep 21, 2017 | Quit Claim Deed, Transfer Quitclaim |
| Sep 21, 2017 | Quit Claim Deed, Transfer Quitclaim |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Sep 15, 2017 |
| Transfer Doc | 0000082414 |
| Record Updated | Sep 20, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Sep 21, 2017 |
| Property Address | 520 31ST AVE, SAN MATEO, CA 94403-3813 |
| Document Number | 0000082415 |
| Instrument Date | Sep 15, 2017 |
| Instrument | 82415 |
| Transaction Type | Transfer |
| Record Updated | Oct 18, 2017 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Personal Trust |
| Address | 520 31ST AVE SAN MATEO CA 944033813, SAN MATEO, CA 94403-3813 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Sep 21, 2017 |
| Property Address | 520 31ST AVE, SAN MATEO, CA 94403-3813 |
| Document Number | 0000082414 |
| Instrument Date | Sep 15, 2017 |
| Instrument | 82414 |
| Transaction Type | Transfer |
| Record Updated | Jan 3, 2018 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property |
| Address | 520 31TH AVE SAN MATEO CA 94403, SAN MATEO, CA 94403 |
The 2025 property tax bill for 520 31st Ave was $6,048.
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 | $385,118 (+2%) Land $150,286 Building $234,832 | ||
| 2025 | $6,048.00 Homeowner's exemption | $377,568 Land $147,340 Building $230,228 | |
| 2023 | $5,660.00 (+0.62%) Homeowner's exemption | $362,908 Land $141,619 Building $221,289 | $1,582,920 |
| 2022 | $5,625.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 520 31st Ave in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 2009.
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 | 2 in force |
| Nearby Flood Claims | 2 (2009–2017) |
| Claims Outside the SFHA | 2 of 2 |
| Most Recent Claim | Jan 2017 · Severe Winter Storms, Flooding, And Mudslides |
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 520 31st 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 716 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, GeoLinks, T-Mobile.
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