San Mateo County property record for 217 Polhemus Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 6.5 ba · 6,700 sqft · built 1991 |
| Lot Size | 1.02 acres (44,523 sqft) |
| Owner | 2 Company Names on Record |
| Last Sale | $8,800,000 (Jul 2013) |
| Tax Bill | $119,616 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-040-190 |
| Primary APN | 070-040-190 |
|---|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 6.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 6,700 sqft Living Area |
| 1st Floor Area | 3,550 sqft |
| 2nd Floor Area | 3,150 sqft |
| Family Room | Family Room |
| Study | Study |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1991 |
|---|---|
| Effective Year Built | Effective 1991 |
| Roof Material | Other |
| Lot Area | 44,523 sqft |
| Lot Dimensions | 218 ft deep x 210 ft wide |
| Garage Area | 820 sqft |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 217 POLHEMUS AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-5408 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | 210 FT X 218 FT PTN OF LOT 3 STERN OAKS RSM 36/19 TOWN OF ATHERTON |
| Legal Subdivision | STERN OAKS |
| Legal Lot Number | 3 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3003 |
| 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 Company Names on Record |
|---|---|
| Mailing Address | 217 POLHEMUS AVE, ATHERTON, CA 94027-5408 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jul 5, 2013 · Amount on Record |
| Deed Sale | Jul 5, 2013 · Amount on Record |
| Deed Document Number | 201399731 |
| Prior Transfer Date | Dec 12, 2001 |
| Prior Transfer Doc | 0000207963 |
| 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 | $11,026,547 (+2%) Land $6,877,086 Building $4,149,461 | ||
| 2025 | $119,616.00 (+2.8%) Homeowner's exemption | $10,810,342 (+4.04%) Land $6,742,242 Building $4,068,100 | |
| 2023 | $116,357.00 (+2.85%) Homeowner's exemption | $10,390,566 Land $6,480,434 Building $3,910,132 | $8,403,840 |
| 2022 | $113,135.00 |
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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