San Mateo County property record for 104 23rd Ave, San Mateo, CA 94403
| Property Type | Duplex |
|---|---|
| Details | 3 bd · 2 ba · 2,740 sqft · built 1939 |
| Lot Size | 0.127 acres (5,525 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $1,500,000 (Aug 2022) |
| Tax Bill | $21,218 (2025) |
| Deeds & Mortgages | Aug 2022 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-151-100 |
| Primary APN | 039-151-100 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Units | 4 Units |
| Stories | 1 Story |
| Building Area | 2,740 sqft Living Area |
| 1st Floor Area | 2,740 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1939 |
|---|---|
| Effective Year Built | Effective 1939 |
| Architectural Style | Duplex Single |
| Lot Area | 5,525 sqft (0.127 acres) |
| View / Lot | Corner |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 104 23RD AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-2204 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | RM0000 |
| Legal Description | 79.01 FT X 100 FT COR 23RD AVE & FLORES ST PTN LOT 5 & 6 BLOCK 3 SAN MATEO VILLA PARK RSM 12/50 51 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO VILLA PARK |
| Legal Block | 3 |
| Legal Lot Number | 5,6 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1010 |
| Census Tract | 607400 |
104 23rd Ave, a duplex, is held in a trust since August 2022.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 412 27TH AVE, SAN MATEO, CA 94403-2402 |
| Owner Type | Company |
| Vesting | 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 29, 2022 · Amount on File |
| Deed Sale | Aug 29, 2022 · Amount on File |
| Deed Document Number | 202263673 |
| Prior Transfer Date | Apr 27, 2015 |
| Prior Transfer Doc | 0000051004 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Aug 29, 2022 |
| Property Address | 104 23RD AVE, SAN MATEO, CA 94403-2204 |
| Document Number | 0000063673 |
| Map Reference | MB 12 PG 50&51 |
| Instrument Date | Aug 16, 2022 |
| Instrument | 2022-063673 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Title Company | FIRST AMERICAN TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $9,150.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 412 27TH AVE, SAN MATEO, CA 94403-2402 |
| Document Number | 0000063674 |
|---|---|
| Date | Aug 29, 2022 |
| Instrument | 2022-063674 |
| Name | STIFEL BANK & TRUST |
|---|---|
| Type | Bank |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Sep 1, 2052 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 4.12% |
| Type Change Date | Sep 1, 2032 |
| Change Frequency | 6 Months |
| Min Rate At Change | 3% |
| Max Rate At Change | 9.12% |
| Index | Other |
| Margin | 3 |
| Max Rate | 9.12% |
The 2025 property tax bill for 104 23rd Ave was $21,218.
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 | $1,591,811 (+2%) Land $1,167,328 Building $424,483 | |
| 2025 | $21,218.00 | $1,560,600 Land $1,144,440 Building $416,160 |
| 2023 | $20,387.00 (+221.41%) | $1,500,000 Land $1,100,000 Building $400,000 |
| 2022 | $6,343.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 104 23rd Ave in Zone X, an area of minimal flood risk.
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 | 1 in force |
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 104 23rd 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 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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