San Mateo County property record for 99 Walnut Ave, Atherton, CA 94027 · Last verified July 2026
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 4.5 ba · 2,850 sqft · built 1998 |
| Lot Size | 0.245 acres (10,687 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $1,525,000 (May 2009) |
| Tax Bill | $24,383 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 060-331-010 |
| Primary APN | 060-331-010 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 4.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,850 sqft Living Area |
| 1st Floor Area | 1,460 sqft |
| 2nd Floor Area | 1,390 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 1998 |
|---|---|
| Effective Year Built | Effective 1998 |
| Lot Area | 10,687 sqft (0.245 acres) |
| Lot Dimensions | 131 ft deep x 82 ft wide |
| View / Lot | Corner |
| Garage Area | 410 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 99 WALNUT AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-3820 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 19 BLOCK A MENLO PARK VILLA LOTS RSM 1/93 TOWN OF ATHERTON |
| Legal Subdivision | MENLO PARK VILLA |
| Legal Block | A |
| Legal Lot Number | 19 |
| 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 060-331-010
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 | 99 WALNUT AVE, ATHERTON, CA 94027-3820 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | May 28, 2009 · Amount on Record |
| Deed Sale | May 28, 2009 · Amount on Record |
| Prior Sale | Aug 03, 2006 · Amount on Record |
| Deed Document Number | 200967550 |
| Last Transfer Date | Sep 02, 2011 |
| Transfer Doc | 0000107531 |
| Record Updated | Sep 20, 2026 |
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 and are not market price estimates.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $2,003,103 (+2%) Land $1,313,513 Building $689,590 | ||
| 2025 | $24,383.00 (+5.07%) Homeowner's exemption | $1,963,827 (+4.04%) Land $1,287,758 Building $676,069 | |
| 2023 | $23,207.00 (+2.49%) Homeowner's exemption | $1,887,570 Land $1,237,753 Building $649,817 | $1,842,300 |
| 2022 | $22,643.00 |
Source: FEMA National Flood Hazard Layer, San Mateo County (06081C), updated September 10, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060816115002, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Special Flood Hazard Area | No |
| Flood Hazard | Minimal |
| 500-Year Floodplain | No |
| Nearby Flood Policies | 4 in force |
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| 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, availability as of December 31, 2025 · Published October 2026 · based on 283 locations within about half a mile of this property
| Provider | Technology | Download / Upload (Mbps) |
|---|---|---|
| Race Telecommunications | Fiber | 10,000 / 10,000 |
| Xfinity | Cable | 2,000 / 250 |
| AT&T | Fixed Wireless | 100 / 20 |
| AT&T | DSL | 100 / 20 |
May also be available at this address: AT&T, T-Mobile USA, Etheric Communications, LLC., California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.
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