San Mateo County property record for 247 Polhemus Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 5.5 ba · 11,860 sqft · built 2019 |
| Lot Size | 1.17 acres (51,356 sqft) |
| Owner | Company Name on File |
| Last Sale | $31,150,000 (Sep 2021) |
| Tax Bill | $362,955 (2025) |
| Deeds & Mortgages | Sep 2021 Sale Oct 2019 Mortgage + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-040-050 |
| Primary APN | 070-040-050 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 5.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 14 Rooms |
| Stories | 2 Stories |
| Building Area | 11,860 sqft Living Area |
| 1st Floor Area | 4,083 sqft |
| 2nd Floor Area | 3,452 sqft |
| Basement Area | 4,325 sqft |
| Finished Basement | 4,325 sqft |
| Family Room | Family Room |
| Study | Study |
| Fireplaces | 3 Fireplaces |
| Fireplace | Fireplace |
| Year Built | Built 2019 |
|---|---|
| Effective Year Built | Effective 2019 |
| Exterior Material | Wood Shingle |
| Roof Material | Wood Shingle |
| Lot Area | 51,356 sqft |
| Lot Dimensions | 311 ft deep x 165 ft wide |
| Garage Area | 841 sqft |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 247 POLHEMUS AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-5442 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | LOT 3 POLHEMUS PARK NO 2 RSM 47/26 TOWN OF ATHERTON |
| Legal Subdivision | POLHEMUS PARK NO 2 |
| 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 · APN 070-040-050
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 | Company Name on File |
|---|---|
| Mailing Address | 247 POLHEMUS AVE, ATHERTON, CA 94027-5442 |
| Owner Type | Company |
| Vesting | Limited Liability Company |
| Date | Document |
|---|---|
| Sep 29, 2021 | Grant Deed, Transfer LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY |
| Oct 08, 2019 | Deed of Trust, Mortgage · Conventional Mortgage JPMORGAN CHASE BANK NA |
| Jun 28, 2019 | Grant Deed, Transfer FIRST AMERICAN TITLE |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Sep 29, 2021 · Amount on Record |
| Deed Sale | Sep 29, 2021 · Amount on Record |
| Prior Sale | Jun 28, 2019 · Amount on Record |
| Deed Document Number | 2021138735 |
| Prior Transfer Date | Aug 19, 2013 |
| Prior Transfer Doc | 0000134155 |
| Record Updated | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Sep 29, 2021 |
| Property Address | 247 POLHEMUS AVE, ATHERTON, CA 94027-5442 |
| Document Number | 0000138735 |
| Map Reference | MB 47 PG 26 |
| Instrument Date | Sep 24, 2021 |
| Instrument | 2021-138735 |
| Transaction Type | Transfer |
| Record Updated | Oct 26, 2021 |
| Title Company | LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY |
| Amount | Amount Recorded |
|---|---|
| Tax | $34,265.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 1101 SEYMOUR LANE, MENLO PARK, CA 94025 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 247 POLHEMUS AVE, ATHERTON, CA 94027-5442 |
| Transaction Type | Mortgage |
| Record Updated | Feb 05, 2021 |
| Title Company | FIRST AMERICAN TITLE |
| Name | Verified Name |
|---|
| Document Number | 0000083277 |
|---|---|
| Date | Oct 08, 2019 |
| Instrument | 2019-083277 |
| Name | JPMORGAN CHASE BANK NA |
|---|---|
| Type | Bank |
| Address | WESTMONT, IL 60559 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Nov 01, 2049 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 2.37% |
| Type Change Date | Nov 01, 2024 |
| Change Frequency | Annually |
| Min Rate At Change | 2.25% |
| Max Rate At Change | 4.37% |
| Index | 1-Year LIBOR |
| Max Rate | 7.37% |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jun 28, 2019 |
| Property Address | 247 POLHEMUS AVE, ATHERTON, CA 94027-5442 |
| Document Number | 0000050253 |
| Instrument Date | Jun 25, 2019 |
| Instrument | 50253 |
| Transaction Type | Transfer |
| Record Updated | Jul 31, 2019 |
| Title Company | FIRST AMERICAN TITLE |
| Amount | Amount Recorded |
|---|---|
| Tax | $34,100.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 7950 JONES BRANCH DR #700N MC LEAN VA 221070002, 700N, MC LEAN, VA 22107-0002 |
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 | $33,717,761 (+2%) Land $12,069,118 Building $21,648,643 | |
| 2025 | $362,955.00 (+1.19%) | $33,056,629 (+4.04%) Land $11,832,469 Building $21,224,160 |
| 2024 | $358,679.00 (+1.56%) | |
| 2023 | $353,160.00 (+2.85%) | $31,773,000 Land $11,373,000 Building $20,400,000 |
| 2022 | $343,388.00 |
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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