San Mateo County property record for 1 Walnut Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,699 sqft · built 1953 |
| Lot Size | 0.239 acres (10,428 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $1,050,000 (Nov 2012) |
| Tax Bill | $7,260 (2025) |
| Deeds & Mortgages | Dec 2023 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 060-331-130 |
| Primary APN | 060-331-130 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,699 sqft Living Area |
| 1st Floor Area | 1,290 sqft |
| Family Room | Family Room |
| Year Built | Built 1953 |
|---|---|
| Effective Year Built | Effective 1953 |
| Lot Area | 10,428 sqft (0.239 acres) |
| Lot Dimensions | 124 ft deep x 84 ft wide |
| View / Lot | Corner |
| Garage Type | Attached |
| Garage Area | 420 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 1 WALNUT AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-3820 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | 84.10 FT X 124 FT COR EL CAMINO RL & WALNUT AVE PTN OF LOTS 33 34 35 BLK A MENLO PARK VILLA LOTS |
| Legal Subdivision | MENLO PARK VILLA |
| Legal Block | A |
| Legal Lot Number | 33 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2023 |
| Census Tract | 611500 |
Source: San Mateo County records · APN 060-331-130
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 | 1 WALNUT AVE, ATHERTON, CA 94027-3820 |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Nov 06, 2012 · Amount on Record |
| Deed Sale | Nov 06, 2012 · Amount on Record |
| Prior Sale | May 02, 2006 · Amount on Record |
| Deed Document Number | 2012163870 |
| Last Transfer Date | Nov 21, 2014 |
| Transfer Doc | 0000022781 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Recording Date | Dec 27, 2023 |
| Property Address | 1 WALNUT AVE, ATHERTON, CA 94027-3820 |
| Document Number | 0000068123 |
| Map Reference | MB 6 PG 295 |
| Instrument Date | Jun 23, 2023 |
| Instrument | 2023-068123 |
| Transaction Type | Transfer |
| Record Updated | Jan 26, 2024 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Revocable Trust |
| Address | 1 WALNUT AVE, ATHERTON, CA 94027-3820 |
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 | Menlo Park City Elementary School District (KG - 08) |
| Secondary School District | Sequoia Union High School District (09 - 12) |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $540,682 (+2%) Land $108,158 Building $432,524 | ||
| 2025 | $7,260.00 (+6.94%) | $530,082 (+4.04%) Land $106,038 Building $424,044 | |
| 2023 | $6,789.00 (+2.34%) Homeowner's exemption | $509,500 Land $101,921 Building $407,579 | $1,240,200 |
| 2022 | $6,634.00 |
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 |
| Nearby Flood Policies | 4 in force |
| Wildfire Risk | Low lower than 99.1% of the US · lower than 99.2% of California |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
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 |
| Xfinity Cable | 2,000 / 250 |
| AT&T Fixed Wireless · DSL · Fiber in parts of the area | 100 / 20 |
May also be available: California Internet, Etheric Communications, LLC., T-Mobile USA.
Based on FCC filings for 283 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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