San Mateo County property record for 217 Atherton Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 6.5 ba · 8,180 sqft · built 2006 |
| Lot Size | 1 acre (43,572 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $21,055,000 (Mar 2024) |
| Tax Bill | $237,397 (2025) |
| Deeds & Mortgages | Mar 2024 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-380-040 |
| Primary APN | 070-380-040 |
|---|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 6.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 16 Rooms |
| Stories | 2 Stories |
| Building Area | 8,180 sqft Living Area |
| Gross Area | 8,544 sqft |
| 1st Floor Area | 3,310 sqft |
| 2nd Floor Area | 3,070 sqft |
| Basement Area | 2,164 sqft |
| Finished Basement | 1,800 sqft |
| Unfinished Basement | 364 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 2006 |
|---|---|
| Effective Year Built | Effective 2006 |
| Lot Area | 43,572 sqft |
| Garage Area | 830 sqft |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 217 ATHERTON AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-5443 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | LOT 9 HELLER ESTATES RSM 53/50 TOWN OF ATHERTON |
| Legal Subdivision | HELLER ESTATES |
| Legal Lot Number | 9 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2001 |
| Census Tract | 611400 |
217 Atherton Ave is held in a trust since March 2024.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 217 ATHERTON AVE, ATHERTON, CA 94027-5443 |
| 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 | Mar 27, 2024 · Amount on File |
| Deed Sale | Mar 27, 2024 · Amount on File |
| Prior Sale | Nov 30, 2006 · Amount on File |
| Deed Document Number | 202415979 |
| Prior Transfer Date | Nov 22, 2006 |
| Prior Transfer Doc | 0000180887 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Mar 27, 2024 |
| Property Address | 217 ATHERTON AVE, ATHERTON, CA 94027-5443 |
| Document Number | 0000015979 |
| Map Reference | MB 53 PG 50 |
| Instrument Date | Mar 18, 2024 |
| Instrument | 2024-015979 |
| Transaction Type | Transfer |
| Record Updated | Apr 17, 2024 |
| Title Company | CHICAGO TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Tax | $23,160.50 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 217 ATHERTON AVE, ATHERTON, CA 94027-5443 |
The 2025 property tax bill for 217 Atherton Ave was $237,397.
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 | Menlo Park City Elementary School District (KG - 08) |
| Secondary School District | Sequoia Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $21,905,622 (+2%) Land $10,341,576 Building $11,564,046 | |
| 2025 | $237,397.00 | $21,476,100 Land $10,138,800 Building $11,337,300 |
| 2023 | $169,517.00 (+2.41%) | $15,375,313 Land $7,340,263 Building $8,035,050 |
| 2022 | $165,530.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 217 Atherton Ave in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 1995.
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 13 policies |
| Nearby Flood Policies | 13 in force |
| Nearby Flood Claims | 2 (1995–1998) |
| Claims Outside the SFHA | 1 of 2 |
| Most Recent Claim | Feb 1998 · Severe Winter Storms And Flooding |
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 217 Atherton Ave is low, with a 0.01% 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 | 0.01% 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 126 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, T-Mobile.
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