San Mateo County property record for 819 S B St, San Mateo, CA 94401
| Property Type | Commercial Office |
|---|---|
| Lot Size | 0.117 acres (5,097 sqft) |
| Owner | Individual Name on File |
| Last Sale | $575,000 (May 2002) |
| Tax Bill | $12,190 (2025) |
| Deeds & Mortgages | Apr 2023 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 034-197-100 |
| Primary APN | 034-197-100 |
|---|
| Lot Area | 5,097 sqft (0.117 acres) |
|---|
| Street Address | 819 S B ST |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94401-4205 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Commercial Office |
| Local Zoning Code | CL00C2 |
| Legal Description | ON NLY COR OF NINTH AVE & SOUTH B ST PTN LOT 5 BLK 5 HAYWARD ADDITION TO CITY OF SAN MATEO RSM D/61 |
| Legal Subdivision | HAYWARD ADDITION TO CITY OF SAN MATEO |
| Legal Block | 5 |
| Legal Lot Number | 5 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2021 |
| Census Tract | 606300 |
819 S B St, a commercial property, is owned by an individual who acquired it in April 2023.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 819 S B ST, SAN MATEO, CA 94401-4205 |
| Owner Type | Individual |
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 | Name on Deed |
|---|---|
| Last Sale | May 31, 2002 · Amount on File |
| Deed Sale | May 31, 2002 · Amount on File |
| Deed Document Number | 2002106238 |
| Last Transfer Date | Apr 13, 2023 |
| Transfer Doc | 0000018023 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Apr 21, 2023 |
| Property Address | 819 S B ST, SAN MATEO, CA 94401-4205 |
| Document Number | 0000018023 |
| Map Reference | MB D PG 61 |
| Instrument Date | Apr 13, 2023 |
| Instrument | 2023-018023 |
| Transaction Type | Transfer |
| Record Updated | May 17, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 819 S B ST, SAN MATEO, CA 94401-4205 |
The 2025 property tax bill for 819 S B St was $12,190.
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 | $900,803 (+1.83%) Land $715,745 Building $185,058 | |
| 2025 | $12,190.00 | $884,620 Land $701,711 Building $182,909 |
| 2023 | $11,980.00 (+1.3%) | $852,705 Land $674,463 Building $178,242 |
| 2022 | $11,826.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 819 S B St 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.
The area around 819 S B St 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 915 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| 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 |
| Sonic Telecom Fiber | 1,000 / 1,000 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: GeoLinks.
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