San Mateo County property record for 81 Atherton Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 6.5 ba · 9,398 sqft · built 2017 |
| Lot Size | 1.08 acres (47,151 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $20,000,000 (Apr 2023) |
| Tax Bill | $230,106 (2025) |
| Deeds & Mortgages | Jan 2026 Transfer Jan 2026 Transfer + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 070-240-110 |
| Primary APN | 070-240-110 |
|---|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 6.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 13 Rooms |
| Stories | 2 Stories |
| Building Area | 9,398 sqft Living Area |
| 1st Floor Area | 3,299 sqft |
| 2nd Floor Area | 3,086 sqft |
| Basement Area | 3,013 sqft |
| Finished Basement | 3,013 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 2017 |
|---|---|
| Effective Year Built | Effective 2017 |
| Lot Area | 47,151 sqft |
| Lot Dimensions | 219 ft deep x 214 ft wide |
| View / Lot | Corner |
| Garage Area | 860 sqft |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 81 ATHERTON AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-4049 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | NWLY 219.54 FT OF LOT 1 ATHERTON TERRACE RSM 30/40 TOWN OF ATHERTON |
| Legal Subdivision | ATHERTON TERRACE |
| Legal Lot Number | 1 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 611400 |
81 Atherton Ave is owner-occupied and held in a trust since April 2023.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 81 ATHERTON AVE, ATHERTON, CA 94027-4049 |
| Occupancy | Owner Occupied |
| 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.
| Date | Document |
|---|---|
| Jan 21, 2026 | Intrafamily Transfer, Transfer |
| Jan 21, 2026 | Intrafamily Transfer, Transfer |
| Apr 13, 2023 | Grant Deed, Transfer OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Apr 13, 2023 · Amount on File |
| Deed Sale | Apr 13, 2023 · Amount on File |
| Prior Sale | Aug 30, 2013 · Amount on File |
| Deed Document Number | 202316481 |
| Prior Transfer Date | Mar 28, 1994 |
| Prior Transfer Doc | 0000065824 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jan 21, 2026 |
| Property Address | 81 ATHERTON AVE, ATHERTON, CA 94027-4049 |
| Document Number | 0000003077 |
| Map Reference | MB 30 PG 40 |
| Instrument Date | Jan 8, 2026 |
| Instrument | 2026-003077 |
| Transaction Type | Transfer |
| Record Updated | Feb 13, 2026 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 81 ATHERTON AVE, ATHERTON, CA 94027-4049 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Jan 21, 2026 |
| Property Address | 81 ATHERTON AVE, ATHERTON, CA 94027-4049 |
| Document Number | 0000003076 |
| Map Reference | MB 30 PG 40 |
| Instrument Date | Jan 8, 2026 |
| Instrument | 2026-003076 |
| Transaction Type | Transfer |
| Record Updated | Feb 13, 2026 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 81 ATHERTON AVE, ATHERTON, CA 94027-4049 |
| Name | Verified Name |
|---|
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Apr 13, 2023 |
| Property Address | 81 ATHERTON AVE, ATHERTON, CA 94027-4049 |
| Document Number | 0000016481 |
| Map Reference | MB 30 PG 40 |
| Instrument Date | Apr 7, 2023 |
| Instrument | 2023-016481 |
| Transaction Type | Transfer |
| Record Updated | May 5, 2023 |
| Title Company | OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Tax | $22,000.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 81 ATHERTON AVE, ATHERTON, CA 94027-4049 |
The 2025 property tax bill for 81 Atherton Ave was $230,106.
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 | Menlo Park City Elementary School District (KG - 08) |
| Secondary School District | Sequoia Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $21,224,160 (+2%) Land $13,265,100 Building $7,959,060 | |
| 2025 | $230,106.00 | $20,808,000 Land $13,005,000 Building $7,803,000 |
| 2023 | $136,813.00 (+2.41%) | $12,358,920 Land $5,797,044 Building $6,561,876 |
| 2022 | $133,591.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 81 Atherton Ave in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 1998.
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 |
| Nearby Flood Policies | 2 in force |
| Nearby Flood Claims | 2 (1998) |
| Claims Outside the SFHA | 2 of 2 |
| Most Recent Claim | Feb 1998 · Severe Winter Storms And Flooding |
| Claims by Event |
|
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 81 Atherton Ave is low, with 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 96% of the US · lower than 97.4% 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 117 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 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: Etheric Networks, T-Mobile.
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