San Mateo County property record for 221 Atherton Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 5.5 ba · 7,790 sqft · built 1963 |
| Lot Size | 0.999 acres (43,559 sqft) |
| Owner | Company Name on Record |
| Last Sale | $9,000,000 (Jun 2013) |
| Tax Bill | $123,975 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-380-060 |
| Primary APN | 070-380-060 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 5.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 18 Rooms |
| Stories | 2 Stories |
| Building Area | 7,790 sqft Living Area |
| 1st Floor Area | 3,230 sqft |
| 2nd Floor Area | 2,780 sqft |
| Basement Area | 1,780 sqft |
| Finished Basement | 1,780 sqft |
| Family Room | Family Room |
| Study | Study |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1963 |
|---|---|
| Effective Year Built | Effective 1963 |
| Architectural Style | Ranch |
| Exterior Material | Stucco |
| Construction Type | Frame |
| Roof Material | Wood Shingle |
| Lot Area | 43,559 sqft |
| Lot Dimensions | 175 ft deep x 249 ft wide |
| View / Lot | Corner |
| Garage Area | 950 sqft |
| Parking Spaces | 4 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 221 ATHERTON AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-5434 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | LOT 7 HELLER ESTATES RSM 53/50 TOWN OF ATHERTON |
| Legal Subdivision | HELLER ESTATES |
| Legal Lot Number | 7 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2001 |
| Census Tract | 611400 |
Source: San Mateo County records, as of July 15, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 2200 GENG RD, 100, PALO ALTO, CA 94303-3358 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Jun 7, 2013 · Amount on Record |
| Deed Sale | Jun 7, 2013 · Amount on Record |
| Prior Sale | Jul 23, 1996 · Amount on Record |
| Deed Document Number | 201386071 |
| Prior Transfer Date | Sep 23, 1998 |
| Prior Transfer Doc | 0000168915 |
| Record Updated | Oct 29, 2026 |
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 | $11,304,505 (+2%) Land $6,845,506 Building $4,458,999 | |
| 2025 | $123,975.00 (+4.79%) | $11,082,849 (+4.04%) Land $6,711,281 Building $4,371,568 |
| 2023 | $118,312.00 (+2.41%) | $10,652,490 Land $6,450,675 Building $4,201,815 |
| 2022 | $115,523.00 |
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 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.
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 | Under 0.01% 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 160 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: Etheric Networks, Verizon.
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