San Mateo County property record for 400 Walsh Rd, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 4.5 ba · 4,250 sqft · built 1976 |
| Lot Size | 1.38 acres (60,252 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $32,427 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 073-263-300 |
| Primary APN | 073-263-300 |
|---|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 4.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Building Area | 4,250 sqft Living Area |
| Gross Area | 4,900 sqft |
| 1st Floor Area | 2,300 sqft |
| 2nd Floor Area | 1,040 sqft |
| Basement Area | 650 sqft |
| Family Room | Family Room |
| Year Built | Built 1976 |
|---|---|
| Effective Year Built | Effective 1976 |
| Lot Area | 60,252 sqft |
| Lot Dimensions | 6,784 ft deep x 6,784 ft wide |
| Garage Type | Basement |
| Garage Area | 650 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 400 WALSH RD |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-6439 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10000 |
| Legal Description | PARCEL 1 1.383 AC MOL PARCEL MAP VOL 30/4 |
| Legal Subdivision | MEZES RANCH |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3010 |
| Census Tract | 611400 |
400 Walsh Rd is owner-occupied and held in a trust since March 1999.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 400 WALSH RD, ATHERTON, CA 94027-6439 |
| Occupancy | Owner Occupied |
| 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 Transfer Date | Mar 31, 1999 |
| Transfer Doc | 0000065123 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 400 Walsh Rd was $32,427.
Source: San Mateo County assessment roll, as of July 15, 2026
| Type | Name |
|---|---|
| State | California |
| Municipality | Atherton Town |
| County | San Mateo County |
| Elementary School District | Las Lomitas Elementary School District (KG - 08) |
| Secondary School District | Sequoia Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $2,865,246 (+2%) Land $1,171,445 Building $1,693,801 | ||
| 2025 | $32,427.00 Homeowner's exemption | $2,809,066 Land $1,148,476 Building $1,660,590 | |
| 2023 | $31,466.00 (+2.79%) Homeowner's exemption | $2,699,988 Land $1,103,880 Building $1,596,108 | $4,466,070 |
| 2022 | $30,613.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 400 Walsh Rd in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2022.
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 |
| Flood Insurance Cost | Premium on File median of 10 policies |
| Nearby Flood Policies | 10 in force |
| Nearby Flood Claims | 1 (2022) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides |
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.
Wildfire risk around 400 Walsh Rd is low, with a 0.02% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 94% of the US · lower than 96% of California |
|---|---|
| Wildfire Likelihood | 0.02% annual chance |
| Exposure | None beyond 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 - BEAR GULCH private · serves 60,382 people · EPA ID CA4110006 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Feb 2025 |
| Lead | 4 ppb (2022–2024) 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 168 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Cruzio Fixed Wireless | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
May also be available: Etheric Networks, Race Communications.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures