San Mateo County property record for 258 Prior Ln, Atherton, CA 94027
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 4.5 ba · 3,983 sqft · built 1929 |
| Lot Size | 1.02 acres (44,476 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $3,125,000 (Oct 2011) |
| Tax Bill | $51,542 (2025) |
| Deeds & Mortgages | Feb 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 061-330-150 |
| Primary APN | 061-330-150 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 4.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 10 Rooms |
| Stories | 2 Stories |
| Building Area | 3,983 sqft Living Area |
| Gross Area | 4,414 sqft |
| 1st Floor Area | 2,177 sqft |
| 2nd Floor Area | 1,549 sqft |
| Basement Area | 431 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 1929 |
|---|---|
| Effective Year Built | Effective 1929 |
| Lot Area | 44,476 sqft |
| Garage Area | 1,108 sqft |
| Parking Spaces | 4 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 258 PRIOR LN |
|---|---|
| City | ATHERTON |
| State | CA |
| Zip | 94027-3015 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1001A |
| Legal Description | LOT 2 LELAND PRIOR ESTATES RSM 47/31 TOWN OF ATHERTON |
| Legal Subdivision | LELAND PRIOR ESTATES |
| Legal Lot Number | 2 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1007 |
| Census Tract | 611500 |
258 Prior Ln is held in a trust since January 2012.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 258 PRIOR LN, ATHERTON, CA 94027-3015 |
| 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 | Oct 24, 2011 · Amount on File |
| Deed Sale | Oct 24, 2011 · Amount on File |
| Deed Document Number | 2011125644 |
| Last Transfer Date | Jan 19, 2012 |
| Transfer Doc | 0000008914 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN MATEO CA |
| Property Address | 258 PRIOR LN, ATHERTON, CA 94027-3015 |
| Transaction Type | Mortgage |
| Record Updated | Oct 18, 2022 |
| Name | Verified Name |
|---|---|
| Address | 258 PRIOR LN, ATHERTON, CA 94027-3015 |
| Document Number | 0000028448 |
|---|---|
| Date | Feb 19, 2021 |
| Instrument | 2021-028448 |
| Name | WST PARTNERS LLC |
|---|---|
| Type | Non-Lending Institution |
| Address | NEWPORT BEACH, CA 92660 |
| Type | Commercial Mortgage |
|---|---|
| Amount | Amount on Record |
The 2025 property tax bill for 258 Prior Ln was $51,542.
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 | $4,534,368 (+2%) Land $3,843,530 Building $690,838 | ||
| 2025 | $51,542.00 | $4,445,461 Land $3,768,167 Building $677,294 | |
| 2023 | $49,144.00 (+2.67%) | $4,272,844 Land $3,621,846 Building $650,998 | $3,418,650 |
| 2022 | $47,866.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 258 Prior Ln 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 | 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.
Wildfire risk around 258 Prior Ln 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 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 296 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, DSL 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, GeoLinks, Sonic Telecom, T-Mobile.
5G (outdoors only) and 4G LTE
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