San Mateo County property record for 336 Walsh Rd, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 6.5 ba · 17,611 sqft · built 2020 |
| Lot Size | 1.45 acres (63,378 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $28,000,000 (Dec 2020) |
| Tax Bill | $333,205 (2025) |
| Deeds & Mortgages | Dec 2020 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 073-220-400 |
| Primary APN | 073-220-400 |
|---|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 6.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 18 Rooms |
| Stories | 2 Stories |
| Building Area | 17,611 sqft Living Area |
| 1st Floor Area | 6,683 sqft |
| 2nd Floor Area | 4,329 sqft |
| Basement Area | 6,599 sqft |
| Finished Basement | 6,599 sqft |
| Year Built | Built 2020 |
|---|---|
| Effective Year Built | Effective 2020 |
| Lot Area | 63,378 sqft |
| Garage Area | 1,114 sqft |
| Parking Spaces | 4 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 336 WALSH RD, 336A |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-6460 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT B 1.455 AC MOL PM 83/73-74 |
| Legal Subdivision | BROAD ACRES ATHERTON |
| Legal Lot Number | B |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3007 |
| Census Tract | 611400 |
Source: San Mateo County records, 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 Individual Names on Record |
|---|---|
| Mailing Address | PO BOX 620048, REDWOOD CITY, CA 94062-0048 |
| Owner Type | Individual |
| Vesting | Community Property |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 15, 2020 · Amount on Record |
| Deed Sale | Dec 15, 2020 · Amount on Record |
| Prior Sale | Dec 15, 2016 · Amount on Record |
| Deed Document Number | 2020145419 |
| Prior Transfer Date | Jul 25, 2006 |
| Prior Transfer Doc | 0000148284 |
| Record Updated | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Dec 15, 2020 |
| Property Address | 336 WALSH RD, ATHERTON, CA 94027-6460 |
| Document Number | 0000145419 |
| Instrument Date | Dec 10, 2020 |
| Instrument | 145419 |
| Transaction Type | Transfer |
| Record Updated | Jan 26, 2021 |
| Title Company | LAWYERS TITLE |
| Amount | Amount Recorded |
|---|---|
| Tax | $30,800.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property |
| Address | PO BOX 1126 BURLINGAME CA 940111126, BURLINGAME, CA 94011-1126 |
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 |
|---|---|---|
| 2026 | $30,914,262 (+2%) Land $15,457,131 Building $15,457,131 | |
| 2025 | $333,205.00 (+2.79%) | $30,308,100 (+4.04%) Land $15,154,050 Building $15,154,050 |
| 2023 | $324,163.00 (+2.84%) | $29,131,200 Land $14,565,600 Building $14,565,600 |
| 2022 | $315,214.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
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 Record 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 95% of the US · lower than 97% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | Direct burnable vegetation |
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 110 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Race Communications Fiber | 10,000 / 10,000 |
| AT&T Fiber · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
May also be available: Cruzio, Etheric Networks, GeoLinks, T-Mobile, Verizon.
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