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Single Family ResidenceResidential
$6,703,300$2,135 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 77How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026

256 PRIOR LN

ATHERTON, CA 94027
4
Beds
2.5
Baths
3,140 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
1.31 ac
Lot SizeThe size of the land the home sits on, from county records.
1960
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
4
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$6.7M
$5.2M low$8.2M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,174 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$301,151 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$121,520
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$179,631
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$295,247
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$4,742,910

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountySAN MATEO
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

Transaction History(4)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Encinal Elementary SchoolA
Elementary · Grades KG–5 · 0.1 mi
H
Menlo-Atherton High SchoolA-
High · Grades 9–12 · 0.8 mi
M
Hillview Middle SchoolA
Middle · Grades 6–8 · 1.9 mi

District: Menlo Park City Elementary School District

Neighborhood · ZIP 94027These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.98
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.93
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.511

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.87%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.7,126
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,411 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$294,375
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$482,221
Average tempThe average temperature here across a full year.59°F
Annual precipHow much rain and melted snow falls here in a typical year.20 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.66%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

256 Prior Ln measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 97% of homes in San Mateo County
  • Costs more per square foot than 98% of homes in San Mateo County
  • Bigger than 91% of homes in San Mateo County
  • Has a bigger lot than 90% of homes in San Mateo County

What homes are worth in Atherton 94027

Each bar is how many homes fall in that price range. The marker is this home.

This home
$2.4M$10M

This home is worth more than 28% of homes in Atherton 94027.

How it measures up in Atherton 94027

The dot is this home. The mark in the middle is the typical home in Atherton 94027.

Estimated value$6,703,300
CheaperTypical $9,130,950Pricier

Pricier than 28% of homes nearby

Price per ft²$2135
CheaperTypical $1990Pricier

Pricier than 60% of homes nearby

Living area3,140 ft²
SmallerTypical 3,910 ft²Bigger

Bigger than 33% of homes nearby

Lot size1.31 ac
SmallerTypical 1 acBigger

Bigger than 88% of homes nearby

Year built1960
OlderTypical 1958Newer

Newer than 54% of homes nearby

How 256 Prior Ln ranks against every home in each area.
MeasureThis homeAtherton 94027San Mateo County
Estimated valuepricier than$6,703,30028% of homes97% of homes
Price per ft²pricier than$213560% of homes98% of homes
Living areabigger than3,140 ft²33% of homes91% of homes
Lot sizebigger than1.31 ac88% of homes90% of homes
Year builtnewer than196054% of homes53% of homes

About 256 Prior Ln

How much is 256 Prior Ln, Atherton, CA worth?

The TopHap Estimate for 256 Prior Ln, Atherton, CA is $6,703,300 as of Aug 30, 2026. The likely range is $5,160,164 to $8,246,435. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 256 Prior Ln, Atherton, CA last sell?

256 Prior Ln, Atherton, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 256 Prior Ln, Atherton, CA?

256 Prior Ln, Atherton, CA has 4 bedrooms, 2.5 bathrooms and 3,140 square feet of living space.

When was 256 Prior Ln, Atherton, CA built?

256 Prior Ln, Atherton, CA was built in 1960, making it 66 years old. The building has 1 story.

What schools serve 256 Prior Ln, Atherton, CA?

256 Prior Ln, Atherton, CA is assigned to Encinal Elementary School (elementary), rated A; Menlo-Atherton High School (high), rated A-; Hillview Middle School (middle), rated A. All sit in Menlo Park City Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 256 Prior Ln, Atherton, CA compare to other homes in Atherton 94027?

Among the 2,582 homes in Atherton 94027, it is worth more than 28% of them ($6,703,300 against a typical $9,130,950), its price per square foot is higher than 60% of them ($2135 against a typical $1990), it is bigger than 33% of them (3,140 ft² against a typical 3,910 ft²), its lot is bigger than 88% of them (1.31 ac against a typical 1 ac) and it is newer than 54% of them (1960 against a typical 1958). Measured against all of San Mateo County, it is worth more than 97% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 256 Prior Ln, Atherton, CA?

The 2025 property tax bill for 256 Prior Ln, Atherton, CA was $6,174. The county assessed it at $301,151.

More homes on Prior Ln

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