San Mateo County property record for 20 James Ave, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 6 ba · 8,916 sqft · built 2007 |
| Lot Size | 0.922 acres (40,175 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $8,400,000 (Dec 2007) |
| Tax Bill | $125,617 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 061-154-090 |
| Primary APN | 061-154-090 |
|---|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 6 Baths |
| Total Rooms | 15 Rooms |
| Stories | 2 Stories |
| Building Area | 8,916 sqft Living Area |
| 1st Floor Area | 3,271 sqft |
| 2nd Floor Area | 2,981 sqft |
| Basement Area | 2,664 sqft |
| Finished Basement | 2,664 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 2007 |
|---|---|
| Effective Year Built | Effective 2007 |
| Lot Area | 40,175 sqft (0.922 acres) |
| Lot Dimensions | 182 ft deep x 220 ft wide |
| View / Lot | Corner |
| Garage Area | 864 sqft |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 20 JAMES AVE |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-2010 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | LOT 12 BLOCK 8 LINDENWOOD MAP NO 3 RSM 24/72 |
| Legal Subdivision | LINDENWOOD MAP NO 3 |
| Legal Block | 8 |
| Legal Lot Number | 12 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 3 |
| Census Block | 3009 |
| Census Tract | 611500 |
20 James Ave is owner-occupied and held in a trust since December 2007.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 20 JAMES AVE, ATHERTON, CA 94027-2010 |
| 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.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 20, 2007 · Amount on File |
| Deed Sale | Dec 20, 2007 · Amount on File |
| Prior Sale | Jan 17, 2003 · Amount on File |
| Deed Document Number | 2007178286 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 20 James Ave was $125,617 with a homeowner's exemption.
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 | $11,465,098 (+2%) Land $5,627,119 Building $5,837,979 | |
| 2025 | $125,617.00 Homeowner's exemption | $11,240,295 Land $5,516,784 Building $5,723,511 |
| 2023 | $119,490.00 (+3.95%) Homeowner's exemption | $10,768,122 Land $5,302,561 Building $5,465,561 |
| 2022 | $114,946.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 20 James Ave in Zone X, an area of minimal flood risk.
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 |
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 20 James Ave is low, with less than 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 97% of the US · lower than 97.8% 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 299 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 · DSL · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Etheric Networks, Sonic Telecom.
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