San Mateo County property record for 92 E 21st Ave, San Mateo, CA 94403
| Property Type | Other |
|---|---|
| Details | 4,975 sqft · built 1960 |
| Lot Size | 0.115 acres (5,000 sqft) |
| Owner | 2 Company Names on Record |
| Last Sale | $650,000 (Dec 2011) |
| Tax Bill | $14,180 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 039-073-390 |
| Primary APN | 039-073-390 |
|---|
| Units | 3 Units |
|---|---|
| Stories | 2 Stories |
| Building Area | 4,975 sqft Gross Area |
| Year Built | Built 1960 |
|---|---|
| Effective Year Built | Effective 1960 |
| Fire Resistance | Masonry Walls, Wood Interior |
| Lot Area | 5,000 sqft (0.115 acres) |
| Lot Dimensions | 100 ft deep x 50 ft wide |
| Heating System | Central |
|---|
| Street Address | 92 E 21ST AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-1843 |
| Property Category | Other |
| Property Type | Other > Miscellaneous |
| Local Zoning Code | C40001 |
| Legal Description | 5000 SQ FT MOL ON SELY LN OF TWENTY FIRST AVE, ACREAGE IN CITY OF SAN MATEO |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2028 |
| Census Tract | 607500 |
Source: San Mateo County records, as of July 15, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Company Names on Record |
|---|---|
| Mailing Address | 30 STERLING CT, VALLEY SPRINGS, CA 95252-8924 |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 28, 2011 · Amount on Record |
| Deed Sale | Dec 28, 2011 · Amount on Record |
| Prior Sale | Jun 14, 2011 · Amount on Record |
| Deed Document Number | 2011161332 |
| Last Transfer Date | May 7, 2015 |
| Transfer Doc | 0000063635 |
| Record Updated | Oct 29, 2026 |
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 |
|---|---|---|
| 2026 | $832,752 (+2%) Land $768,701 Building $64,051 | |
| 2025 | $14,180.00 (+21.63%) | $816,425 (+4.04%) Land $753,629 Building $62,796 |
| 2023 | $11,658.00 (-1.71%) | $784,723 Land $724,365 Building $60,358 |
| 2022 | $11,861.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
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 moderate risk |
|---|---|
| 500-Year Floodplain | Yes 0.2% annual chance |
| Nearest Special Flood Hazard Area | Zone AH, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on Record median of 15 policies |
| Nearby Flood Policies | 15 in force |
| Nearby Flood Claims | 1 (2022) |
| Most Recent Claim | Dec 2022 · Severe Winter Storms, Flooding, Landslides, 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.
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 423 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 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: GeoLinks, Verizon.
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