San Mateo County property record for 120 E 20th Ave, San Mateo, CA 94403
| Property Type | Other |
|---|---|
| Details | 1,550 sqft · built 1957 |
| Lot Size | 0.134 acres (5,829 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $618,000 (Sep 2014) |
| Tax Bill | $11,073 (2025) |
| Flood Zone | Zone AH (high risk) |
| APN | 035-234-010 |
| Primary APN | 035-234-010 |
|---|
| Stories | 1 Story |
|---|---|
| Building Area | 1,550 sqft Gross Area |
| 1st Floor Area | 1,550 sqft |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1957 |
| Lot Area | 5,829 sqft (0.134 acres) |
| Street Address | 120 E 20TH AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-1343 |
| Property Category | Other |
| Property Type | Other > Miscellaneous |
| Local Zoning Code | C40001 |
| Legal Description | 50 FT ON S SIDE OF 20TH AVE BEG 658 FT FROM STATE HIWAY PORT OF LOT 141 SAN MATEO CITY HMSTD ASSN RSM A/43 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO CITY HMSTD ASSN |
| Legal Lot Number | 141 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2024 |
| Census Tract | 607500 |
Source: San Mateo County records · APN 035-234-010
Assessment roll updated July 15, 2026 · Last verified July 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 File |
|---|---|
| Mailing Address | 120 E 20TH AVE, SAN MATEO, CA 94403-1343 |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Sep 23, 2014 · Amount on Record |
| Deed Sale | Sep 23, 2014 · Amount on Record |
| Prior Sale | Jun 08, 2000 · Amount on Record |
| Deed Document Number | 201485996 |
| Record Updated | Sep 20, 2026 |
Source: San Mateo County records · Assessment roll updated July 15, 2026 · Last verified July 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) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $757,587 (+2%) Land $691,395 Building $66,192 | |
| 2025 | $11,073.00 (+1.65%) | $742,734 (+4.04%) Land $677,839 Building $64,895 |
| 2023 | $10,893.00 (+9.55%) | $713,895 Land $651,519 Building $62,376 |
| 2022 | $9,943.00 |
Source: FEMA National Flood Hazard Layer, San Mateo County (06081C), updated September 10, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060816075002, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone AH high risk · shallow ponding 1–3 ft |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | 12.0 ft |
| Flood Insurance Requirement | Required federally backed loans |
| 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 |
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
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: FCC Broadband Data Collection, availability as of December 31, 2025 · sampled at 423 locations within half a mile · Last verified October 2026
| 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 |
| Radiate Holdings Cable · Fiber in parts of the area | 1,500 / 50 |
| Etheric Communications, LLC. Fixed Wireless | 250 / 100 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
May also be available: California Internet, Verizon.
Source: EPA Safe Drinking Water Information System via ECHO, 2026 Q3 · EPA community water system boundaries v3.0, March 2026 · Last verified October 2026
| Water System | CALIFORNIA WATER SERVICE - SAN MATEO private · serves 103,536 people |
|---|---|
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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