San Mateo County property record for 297 Polhemus Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 4.5 ba · 10,230 sqft · built 2011 |
| Lot Size | 1.12 acres (49,138 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $2,650,000 (Mar 2007) |
| Tax Bill | $102,221 (2025) |
| Deeds & Mortgages | Jul 2019 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-032-010 |
| Primary APN | 070-032-010 |
|---|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 4.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 1 Story |
| Building Area | 10,230 sqft Living Area |
| Gross Area | 10,960 sqft |
| 1st Floor Area | 7,000 sqft |
| Basement Area | 3,960 sqft |
| Finished Basement | 3,230 sqft |
| Unfinished Basement | 730 sqft |
| Family Room | Family Room |
| Year Built | Built 2011 |
|---|---|
| Effective Year Built | Effective 2011 |
| Lot Area | 49,138 sqft |
| Lot Dimensions | 245 ft deep x 199 ft wide |
| View / Lot | Corner |
| Garage Area | 900 sqft |
| Parking Spaces | 4 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 297 POLHEMUS AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-5456 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | LOT 1 LESS SWLY 6 IN VARNEY SUBDIVISION RSM 44/20 TOWN OF ATHERTON |
| Legal Subdivision | VARNEY SUBDIVISION |
| Legal Lot Number | 1 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3003 |
| Census Tract | 611400 |
297 Polhemus Ave is held in a trust since March 2007.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | PO BOX 7332, MENLO PARK, CA 94026-7332 |
| 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, 2007 · Amount on File |
| Deed Sale | Mar 27, 2007 · Amount on File |
| Deed Document Number | 200746417 |
| Prior Transfer Date | Feb 1, 1997 |
| Prior Transfer Doc | 0000020783 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 297 POLHEMUS AVE, ATHERTON, CA 94027-5456 |
| Document Number | 0000060621 |
| Instrument Date | Jul 26, 2019 |
| Transaction Type | Mortgage |
| Record Updated | Aug 20, 2019 |
| Title Company | FIRST AMERICAN TITLE |
| Name | Verified Name |
|---|---|
| Relationship | Revocable Trust |
| Address | 297 POLHEMUS AVE ATHERTON CA 940275456, ATHERTON, CA 94027-5456 |
| Document Number | 0000060621 |
|---|---|
| Date | Aug 1, 2019 |
| Instrument | 60621 |
| Name | OCMBC INC |
|---|---|
| Address | 19000 MACARTHUR BLVD # 200, IRVINE, CA 92612-1420 |
| Amount | Amount on Record |
|---|---|
| Term | 480 Months |
| Due | Jul 31, 2059 |
The 2025 property tax bill for 297 Polhemus Ave was $102,221.
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 | $9,397,423 (+2%) Land $3,587,283 Building $5,810,140 | |
| 2025 | $102,221.00 | $9,213,161 Land $3,516,945 Building $5,696,216 |
| 2023 | $99,690.00 (+2.83%) | $8,855,405 Land $3,380,379 Building $5,475,026 |
| 2022 | $96,951.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 297 Polhemus Ave in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2022.
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 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.
Wildfire risk around 297 Polhemus Ave is low, with less than 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 97% of the US · lower than 97.8% 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 136 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, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: Etheric Networks.
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