San Mateo County property record for 222 Polhemus Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 6.5 ba · 5,870 sqft · built 1983 |
| Lot Size | 1.16 acres (50,663 sqft) |
| Owner | Company Name on Record |
| Last Sale | $7,380,000 (Apr 2008) |
| Tax Bill | $107,482 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-022-800 |
| Primary APN | 070-022-800 |
|---|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 6.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 5,870 sqft Living Area |
| Gross Area | 6,760 sqft |
| 1st Floor Area | 3,320 sqft |
| 2nd Floor Area | 2,300 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 1983 |
|---|---|
| Effective Year Built | Effective 1983 |
| Lot Area | 50,663 sqft |
| View / Lot | Corner |
| Garage Type | Attached |
| Garage Area | 890 sqft |
| Parking Spaces | 4 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 222 POLHEMUS AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-5440 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10000 |
| Legal Description | PARCEL B 1.163 AC MOL PARCEL MAP VOL 52/56 |
| Legal Subdivision | POLHEMUS MEADOW |
| Legal Lot Number | 3 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3000 |
| 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 | Company Name on Record |
|---|---|
| Mailing Address | 222 POLHEMUS AVE, ATHERTON, CA 94027-5440 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Apr 18, 2008 · Amount on Record |
| Deed Sale | Apr 18, 2008 · Amount on Record |
| Deed Document Number | 200843618 |
| Prior Transfer Date | Mar 17, 1999 |
| Prior Transfer Doc | 0000053177 |
| Record Updated | Sep 20, 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 | 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 | $9,887,651 (+2%) Land $9,820,669 Building $66,982 | ||
| 2025 | $107,482.00 (+2.8%) | $9,693,776 (+4.04%) Land $9,628,107 Building $65,669 | |
| 2023 | $104,553.00 (+2.85%) | $9,317,357 Land $9,254,237 Building $63,120 | $7,636,590 |
| 2022 | $101,659.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 | 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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