San Mateo County property record for 337 31st Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 1,130 sqft · built 1941 |
| Lot Size | 0.115 acres (5,005 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $1,900,000 (May 2021) |
| Tax Bill | $23,364 (2025) |
| Deeds & Mortgages | Oct 2019 Mortgage May 2021 Sale + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-440-140 |
| Primary APN | 039-440-140 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,130 sqft Living Area |
| Gross Area | 1,640 sqft |
| 1st Floor Area | 1,130 sqft |
| Basement Area | 510 sqft |
| Family Room | Family Room |
| Year Built | Built 1941 |
|---|---|
| Effective Year Built | Effective 1941 |
| Lot Area | 5,005 sqft (0.115 acres) |
| Lot Dimensions | 91 ft deep x 55 ft wide |
| Garage Type | Basement |
| Garage Area | 510 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 337 31ST AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-3310 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10006 |
| Legal Description | LOT 20 HILLSDALE UNIT NO 1 RSM 22/68 CITY OF SAN MATEO |
| Legal Subdivision | HILLSDALE UNIT NO 1 |
| Legal Tract | 1 |
| Legal Lot Number | 20 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2014 |
| Census Tract | 607300 |
337 31st Ave is owned and occupied by two individuals who bought it in May 2021.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 337 31ST AVE, SAN MATEO, CA 94403-3310 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
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 |
|---|---|
| Oct 21, 2019 | Deed of Trust, Mortgage · Conventional Mortgage WELLS FARGO BANK NA |
| May 28, 2021 | Grant Deed, Transfer OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Oct 3, 2019 | Loan Modification, Mortgage · Line of Credit WELLS FARGO BK |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | May 28, 2021 · Amount on File |
| Deed Sale | May 28, 2021 · Amount on File |
| Prior Sale | Mar 23, 2012 · Amount on File |
| Deed Document Number | 202183724 |
| Prior Transfer Date | Feb 10, 1995 |
| Prior Transfer Doc | 0000021482 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 337 31ST AVE, SAN MATEO, CA 94403-3310 |
| Transaction Type | Mortgage |
| Record Updated | Oct 18, 2022 |
| Title Company | FIRST AMERICAN TITLE |
| Name | Verified Name |
|---|
| Document Number | 0000087385 |
|---|---|
| Date | Oct 21, 2019 |
| Instrument | 2019-087385 |
| Name | WELLS FARGO BANK NA |
|---|---|
| Type | Bank |
| Address | SIOUX FALLS, SD 57104 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Nov 1, 2049 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | May 28, 2021 |
| Property Address | 337 31ST AVE, SAN MATEO, CA 94403-3310 |
| Document Number | 0000083724 |
| Map Reference | MB 22 PG 68 |
| Instrument Date | May 21, 2021 |
| Instrument | 2021-083724 |
| Transaction Type | Transfer |
| Record Updated | Oct 18, 2022 |
| Title Company | OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Tax | $11,590.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 337 31ST AVE, SAN MATEO, CA 94403-3310 |
| Document Type | Loan Modification |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 337 31ST AVE, SAN MATEO, CA 94403-3310 |
| Document Number | 0000087387 |
| Instrument Date | Oct 3, 2019 |
| Transaction Type | Mortgage |
| Record Updated | Nov 7, 2019 |
| Title Company | FIRST AMERICAN TITLE |
| Name | Verified Name |
|---|---|
| Relationship | Community Property |
| Address | 337 31ST AVE SAN MATEO CA 944033310, SAN MATEO, CA 94403-3310 |
| Document Number | 0000087387 |
|---|---|
| Date | Oct 21, 2019 |
| Instrument | 87387 |
| Name | WELLS FARGO BK |
|---|---|
| Type | Bank |
| Address | PORTLAND, OR 97208-4149 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Rate Type | Adjustable Rate |
|---|
The 2025 property tax bill for 337 31st Ave was $23,364 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 | $2,060,000 (+6.19%) Land $1,258,500 Building $801,500 | ||
| 2025 | $23,364.00 Homeowner's exemption | $1,940,000 Land $1,185,000 Building $755,000 | |
| 2023 | $23,964.00 (+2.9%) Homeowner's exemption | $1,976,760 Land $1,248,480 Building $728,280 | $1,603,980 |
| 2022 | $23,289.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 337 31st Ave in Zone X, an area of minimal flood risk, though there have been 4 flood claims nearby since 1998.
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 | 4 (1998–2022) |
| Claims Outside the SFHA | 4 of 4 |
| Most Recent Claim | Dec 2022 · rainfall accumulation |
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 337 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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