San Mateo County property record for 420 Warren Rd, San Mateo, CA 94402
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,610 sqft · built 1949 |
| Lot Size | 0.116 acres (5,037 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $2,500,000 (Mar 2018) |
| Tax Bill | $34,038 (2025) |
| Deeds & Mortgages | Mar 2018 Line of Credit Mar 2018 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 032-031-140 |
| Primary APN | 032-031-140 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,610 sqft Living Area |
| Gross Area | 1,970 sqft |
| 1st Floor Area | 1,410 sqft |
| Basement Area | 560 sqft |
| Finished Basement | 200 sqft |
| Unfinished Basement | 360 sqft |
| Family Room | Family Room |
| Year Built | Built 1949 |
|---|---|
| Effective Year Built | Effective 1949 |
| Lot Area | 5,037 sqft (0.116 acres) |
| Lot Dimensions | 89 ft deep x 63 ft wide |
| Garage Type | Basement |
| Garage Area | 360 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 420 WARREN RD |
|---|---|
| City | SAN MATEO |
| State | CA |
| Zip | 94402-1059 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10010 |
| Legal Description | 73.50 FT X 54.33 FT F & R MEAS ON WARREN RD ELY PTN OF LOT 218 SAN MATEO PARK SUB NO 2 RSM D/55 CITY OF SAN MATEO |
| Legal Subdivision | SAN MATEO PARK |
| Legal Lot Number | 218 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1007 |
| Census Tract | 605800 |
420 Warren Rd is held in a trust since March 2018.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 169 25TH AVE, SAN FRANCISCO, CA 94121-1106 |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Mar 7, 2018 | Deed of Trust, Mortgage · Line of Credit BOSTON PRIVATE BANK & TRUST COMPANY |
| Mar 30, 2018 | Grant Deed, Transfer LAWYERS TITLE |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Mar 30, 2018 · Amount on File |
| Deed Sale | Mar 30, 2018 · Amount on File |
| Prior Sale | Apr 5, 2012 · Amount on File |
| Deed Document Number | 201824242 |
| Prior Transfer Date | Mar 25, 2014 |
| Prior Transfer Doc | 0000025339 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 420 WARREN RD, SAN MATEO, CA 94402-1059 |
| Transaction Type | Mortgage |
| Record Updated | Oct 21, 2022 |
| Title Company | LAWYERS TITLE OF NORTHERN CA |
| Name | Verified Name |
|---|
| Document Number | 0000016567 |
|---|---|
| Date | Mar 7, 2018 |
| Instrument | 2018-016567 |
| Name | BOSTON PRIVATE BANK & TRUST COMPANY |
|---|---|
| Type | Bank |
| Address | BOSTON, MA 02109 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Rate Type | Adjustable Rate |
|---|---|
| Change Frequency | Monthly |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Mar 30, 2018 |
| Property Address | 420 WARREN RD, SAN MATEO, CA 94402-1059 |
| Document Number | 0000024242 |
| Instrument Date | Mar 23, 2018 |
| Instrument | 24242 |
| Transaction Type | Transfer |
| Record Updated | Apr 18, 2018 |
| Title Company | LAWYERS TITLE |
| Amount | Amount on Record |
|---|---|
| Tax | $2,750.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | PO BOX 117644 BURLINGAME CA 940117644, BURLINGAME, CA 94011-7644 |
The 2025 property tax bill for 420 Warren Rd was $34,038.
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 | $2,901,459 (+2%) Land $2,089,052 Building $812,407 | ||
| 2025 | $34,038.00 | $2,844,569 Land $2,048,091 Building $796,478 | |
| 2023 | $32,854.00 (+0.86%) | $2,734,112 Land $1,968,562 Building $765,550 | $2,320,650 |
| 2022 | $32,575.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 420 Warren Rd in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2012.
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 | 3 in force |
| Nearby Flood Claims | 1 (2012) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Mar 2012 · 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.
The area around 420 Warren Rd 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 561 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · 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 |
| Verizon Fixed Wireless | 1,000 / 75 |
May also be available: Etheric Networks, T-Mobile.
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