San Mateo County property record for 107 43rd Ave, San Mateo, CA 94403
| Property Type | Duplex |
|---|---|
| Details | 4 bd · 2 ba · 3,235 sqft · built 1948 |
| Lot Size | 0.117 acres (5,091 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $1,698,000 (Aug 2025) |
| Tax Bill | $5,137 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 042-262-260 |
| Primary APN | 042-262-260 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 8 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 3,235 sqft Living Area |
| Year Built | Built 1948 |
|---|---|
| Effective Year Built | Effective 1948 |
| Architectural Style | Duplex Single |
| Lot Area | 5,091 sqft (0.117 acres) |
| Lot Dimensions | 78 ft deep x 65 ft wide |
| Terrain | Above Road/Slope |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 107 43RD AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-5113 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | R20000 |
| Legal Description | LOT 40 BLOCK 23 SAN MATEO KNOLLS MAP NO 2 RSM 24/61 62 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO KNOLLS MAP NO 2 |
| Legal Block | 23 |
| Legal Lot Number | 40 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2027 |
| Census Tract | 607200 |
107 43rd Ave, a duplex, is held in a trust since August 2025.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 102 N HUMMINGBIRD LN, SAN MATEO, CA 94402-1992 |
| Owner Type | Company |
| Vesting | Trust, Revocable Trust |
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 | 2 Names on Deed |
|---|---|
| Last Sale | Aug 8, 2025 · Amount on File |
| Deed Sale | Aug 8, 2025 · Amount on File |
| Deed Document Number | 202540619 |
| Prior Transfer Date | May 28, 2025 |
| Prior Transfer Doc | 0000028153 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 107 43rd Ave was $5,137.
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 | $1,698,000 (+1,313.96%) Land $1,488,000 Building $210,000 | |
| 2025 | $5,137.00 | $120,088 Land $35,554 Building $84,534 |
| 2023 | $5,085.00 (+7.53%) | $115,426 Land $34,174 Building $81,252 |
| 2022 | $4,729.00 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
FEMA maps place 107 43rd Ave in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 1986.
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 Claims | 1 (1986) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Feb 1986 · Severe Storms & Flooding |
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 107 43rd 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 734 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 |
| Verizon Fixed Wireless | 300 / 20 |
| Starlink Satellite | 280 / 30 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: GeoLinks, Sonic Telecom.
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