San Mateo County property record for 248 Polhemus Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 7.5 ba · 9,938 sqft · built 2014 |
| Lot Size | 1 acres (43,581 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $4,700,000 (Jul 2014) |
| Tax Bill | $124,182 (2025) |
| Deeds & Mortgages | Jun 2022 Transfer Jun 2020 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-022-530 |
| Primary APN | 070-022-530 |
|---|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 7.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 16 Rooms |
| Stories | 2 Stories |
| Building Area | 9,938 sqft Living Area |
| 1st Floor Area | 3,665 sqft |
| 2nd Floor Area | 2,660 sqft |
| Basement Area | 3,613 sqft |
| Finished Basement | 3,613 sqft |
| Family Room | Family Room |
| Year Built | Built 2014 |
|---|---|
| Effective Year Built | Effective 2014 |
| Lot Area | 43,581 sqft |
| Lot Dimensions | 215 ft deep x 197 ft wide |
| View / Lot | Corner |
| Garage Area | 802 sqft |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 248 POLHEMUS AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-5439 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | LOT 7 POLHEMUS ACRES RSM 17/4 TOWN OF ATHERTON |
| Legal Subdivision | POLHEMUS ACRES |
| Legal Lot Number | 7 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3000 |
| Census Tract | 611400 |
Source: San Mateo County records · APN 070-022-530
Assessment roll updated July 15, 2026 · Last verified July 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 File |
|---|---|
| Mailing Address | 248 POLHEMUS AVE, ATHERTON, CA 94027-5439 |
| Owner Type | Company |
| Vesting | Trust |
| Date | Document |
|---|---|
| Jun 06, 2022 | Intrafamily Transfer, Transfer |
| Jun 30, 2020 | Deed of Trust, Mortgage · Conventional Mortgage WELLS FARGO BANK NA |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Jul 22, 2014 · Amount on Record |
| Deed Sale | Jul 22, 2014 · Amount on Record |
| Prior Sale | Sep 04, 2009 · Amount on Record |
| Deed Document Number | 201465189 |
| Last Transfer Date | Sep 22, 2014 |
| Transfer Doc | 0000092198 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jun 06, 2022 |
| Property Address | 248 POLHEMUS AVE, ATHERTON, CA 94027-5439 |
| Document Number | 0000045841 |
| Map Reference | MB 17 PG 4 |
| Instrument Date | Apr 29, 2022 |
| Instrument | 2022-045841 |
| Transaction Type | Transfer |
| Record Updated | Jun 07, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 248 POLHEMUS AVE, ATHERTON, CA 94027-5439 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 248 POLHEMUS AVE, ATHERTON, CA 94027-5439 |
| Transaction Type | Mortgage |
| Record Updated | Feb 05, 2021 |
| Name | Verified Name |
|---|
| Document Number | 0000061716 |
|---|---|
| Date | Jun 30, 2020 |
| Instrument | 2020-061716 |
| Name | WELLS FARGO BANK NA |
|---|---|
| Type | Bank |
| Address | SIOUX FALLS, SD 57104 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Jul 01, 2050 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 2.5% |
| Type Change Date | Jul 01, 2027 |
| Change Frequency | Annually |
| Min Rate At Change | 2.25% |
| Max Rate At Change | 4.5% |
| Index | 1-Year LIBOR |
| Max Rate | 7.5% |
Source: San Mateo County records · Assessment roll updated July 15, 2026 · Last verified July 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) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $11,339,449 (+2%) Land $5,761,666 Building $5,577,783 | |
| 2025 | $124,182.00 (+2.84%) | $11,117,108 (+4.04%) Land $5,648,693 Building $5,468,415 |
| 2023 | $120,754.00 (+2.92%) | $10,685,420 Land $5,429,349 Building $5,256,071 |
| 2022 | $117,324.00 |
Source: FEMA National Flood Hazard Layer as of September 10, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 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 |
| Wildfire Risk | Low lower than 95% of the US · lower than 97% of California |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | Direct burnable vegetation at the parcel |
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: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Race Telecommunications 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 Communications, LLC..
Based on FCC filings for 136 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | CALIFORNIA WATER SERVICE - BEAR GULCH private · serves 60,382 people |
|---|---|
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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