San Mateo County property record for 421 23rd Ave, San Mateo, CA 94403
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 1,667 sqft · built 1950 |
| Lot Size | 0.142 acres (6,168 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $781,000 (Mar 2013) |
| Tax Bill | $14,879 (2025) |
| Deeds & Mortgages | Jul 2017 Line of Credit Apr 2021 Transfer + 2 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 039-132-180 |
| Primary APN | 039-132-180 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 8 Rooms |
| Stories | 1 Story |
| Building Area | 1,667 sqft Living Area |
| 1st Floor Area | 850 sqft |
| Family Room | Family Room |
| Year Built | Built 1950 |
|---|---|
| Effective Year Built | Effective 1950 |
| Lot Area | 6,168 sqft (0.142 acres) |
| Lot Dimensions | 125 ft deep x 50 ft wide |
| Garage Area | 300 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 421 23RD AVE |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94403-2241 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R106 |
| Legal Description | 50.24 FT X 122 FT MOL ON SLY LN OF 23RD AVE COM SWLY 150 FT FRM ISABELLE AVE PTN OF LOT 14 BLK 7 SAN MATEO VILLA PARK RSM 12/50 51 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO VILLA PARK |
| Legal Block | 7 |
| Legal Lot Number | 14 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2000 |
| Census Tract | 606700 |
Source: San Mateo County assessment roll, 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 File |
|---|---|
| Mailing Address | 421 23RD AVE, SAN MATEO, CA 94403-2241 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Date | Document |
|---|---|
| Jul 5, 2017 | Deed of Trust, Mortgage · Line of Credit PENTAGON FCU |
| Apr 1, 2021 | Intrafamily Transfer, Transfer CHICAGO TITLE COMPANY |
| Apr 1, 2021 | Intrafamily Transfer, Transfer · Conventional Mortgage QUICKEN LOANS LLC |
| Jun 19, 2019 | Quit Claim Deed, Transfer ATTORNEY ONLY |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Mar 27, 2013 · Amount on Record |
| Deed Sale | Mar 27, 2013 · Amount on Record |
| Deed Document Number | 201346776 |
| Last Transfer Date | Mar 24, 2021 |
| Transfer Doc | 0000052462 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 421 23RD AVE, SAN MATEO, CA 94403-2241 |
| Transaction Type | Mortgage |
| Record Updated | Aug 5, 2022 |
| Title Company | AMERICAN TITLE INC |
| Name | Verified Name |
|---|
| Document Number | 0000056700 |
|---|---|
| Date | Jul 5, 2017 |
| Instrument | 2017-056700 |
| Name | PENTAGON FCU |
|---|---|
| Type | Credit Union |
| Address | ALEXANDRIA, VA 22314 |
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Term | 179 Months |
| Due | Jun 21, 2032 |
| Rate Type | Adjustable Rate |
|---|---|
| Change Frequency | Monthly |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Apr 1, 2021 |
| Property Address | 421 23RD AVE, SAN MATEO, CA 94403-2241 |
| Document Number | 0000052462 |
| Map Reference | MB 12 PG 41&50 |
| Instrument Date | Mar 24, 2021 |
| Instrument | 2021-052462 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Title Company | CHICAGO TITLE COMPANY |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 421 23RD AVE, SAN MATEO, CA 94403-2241 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Apr 1, 2021 |
| Property Address | 421 23RD AVE, SAN MATEO, CA 94403-2241 |
| Document Number | 0000052460 |
| Map Reference | MB 12 PG 41&50 |
| Instrument Date | Mar 24, 2021 |
| Instrument | 2021-052460 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Title Company | CHICAGO TITLE COMPANY |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 421 23RD AVE, SAN MATEO, CA 94403-2241 |
| Document Number | 0000052461 |
|---|---|
| Date | Apr 1, 2021 |
| Instrument | 2021-052461 |
| Name | QUICKEN LOANS LLC |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Apr 1, 2051 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jun 19, 2019 |
| Property Address | 421 23RD AVE, SAN MATEO, CA 94403-2241 |
| Document Number | 0000047373 |
| Instrument Date | May 24, 2019 |
| Instrument | 47373 |
| Transaction Type | Transfer |
| Record Updated | Jul 15, 2019 |
| Title Company | ATTORNEY ONLY |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Revocable Trust |
| Address | 421 23RD AVE SAN MATEO CA 944032241, SAN MATEO, CA 94403-2241 |
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 | Assessed Market Value |
|---|---|---|---|
| 2026 | $1,127,254 (+2%) Land $490,482 Building $636,772 | ||
| 2025 | $14,879.00 (+6.58%) Homeowner's exemption | $1,105,152 (+4.04%) Land $480,865 Building $624,287 | |
| 2023 | $13,961.00 (+0.94%) Homeowner's exemption | $1,062,241 Land $462,194 Building $600,047 | $2,011,950 |
| 2022 | $13,831.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 |
| Nearby Flood Claims | 1 (1979) |
| Most Recent Claim | Apr 1979 · rainfall accumulation |
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 |
|---|
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 799 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 |
| Radiate Holdings Cable | 1,500 / 50 |
May also be available: California Internet, Etheric Communications, LLC., T-Mobile USA, Verizon.
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