San Mateo County property record for 27 Walnut Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,290 sqft · built 1953 |
| Lot Size | 0.241 acres (10,512 sqft) |
| Owner | Company Name on Record |
| Tax Bill | $4,407 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 060-331-120 |
| Primary APN | 060-331-120 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Building Area | 1,290 sqft Living Area |
| 1st Floor Area | 1,290 sqft |
| Family Room | Family Room |
| Year Built | Built 1953 |
|---|---|
| Effective Year Built | Effective 1953 |
| Lot Area | 10,512 sqft (0.241 acres) |
| Lot Dimensions | 84 ft deep x 125 ft wide |
| Garage Area | 420 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 27 WALNUT AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-3820 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | 125 FT X 84.10 FT ON WALNUT AVE COM 124 FT FRM EL CAMINO RL PTN OF LOTS 31 32 & 33 BLOCK A MENLO PARK VILLA LOTS |
| Legal Subdivision | MENLO PARK VILLA |
| Legal Block | A |
| Legal Lot Number | 31 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 2 |
| Census Block | 2023 |
| Census Tract | 611500 |
Source: San Mateo County records, as of July 15, 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 Record |
|---|---|
| Mailing Address | 27 WALNUT AVE, ATHERTON, CA 94027-3820 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Transfer Date | Jun 24, 1994 |
| Transfer Doc | 0000123309 |
| Record Updated | Sep 20, 2026 |
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 | Assessed Market Value |
|---|---|---|---|
| 2026 | $135,963 (+2%) Land $41,256 Building $94,707 | ||
| 2025 | $4,407.00 (+6.68%) Homeowner's exemption | $133,298 (+4.04%) Land $40,448 Building $92,850 | |
| 2023 | $4,131.00 (+2.94%) Homeowner's exemption | $128,124 Land $38,878 Building $89,246 | $3,110,670 |
| 2022 | $4,013.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 | 4 in force |
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: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| 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 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 283 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Race Communications 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: Etheric Networks, GeoLinks, T-Mobile.
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