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Single Family ResidenceResidential
$2,989,309$1,288 / 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 84How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $2,900,000 on May 19, 2020

280 S BALSAMINA WAY

PORTOLA VALLEY, CA 94028
4
Beds
3
Baths
2,320 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.
0.21 ac
Lot SizeThe size of the land the home sits on, from county records.
1956
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$3M
$2.5M low$3.5M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$2,900,000 · May 19, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$36,388 (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.$3,234,999 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$2,116,136
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,118,863
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$3,171,569
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,020,040

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Contemporary
CountySAN MATEO
Lot (acres)The size of the land the home sits on, from county records.0.21
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Wood Shingle
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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(7)

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.

M
La Entrada SchoolA+
Middle · Grades 4–8 · 2.1 mi
E
Las Lomitas Elementary SchoolA+
Elementary · Grades KG–3 · 3.0 mi
H
Menlo-Atherton High SchoolA
High · Grades 9–12 · 4.5 mi

District: Las Lomitas Elementary School District

Neighborhood · ZIP 94028These 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.75
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.83
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.708

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.6,086
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.365 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$234,946
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$375,942
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.33 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.67%

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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

280 S Balsamina Way 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 86% of homes in San Mateo County
  • Costs more per square foot than 77% of homes in San Mateo County
  • Bigger than 78% of homes in San Mateo County
  • Has a smaller lot than 92% of homes in Portola Valley 94028
  • Older than 70% of homes in Portola Valley 94028

What homes are worth in Portola Valley 94028

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

This home
$1.7M$10M

This home is worth more than 24% of homes in Portola Valley 94028.

How it measures up in Portola Valley 94028

The dot is this home. The mark in the middle is the typical home in Portola Valley 94028.

Estimated value$2,989,309
CheaperTypical $3,811,547Pricier

Pricier than 24% of homes nearby

Price per ft²$1288
CheaperTypical $1434Pricier

Pricier than 29% of homes nearby

Living area2,320 ft²
SmallerTypical 2,720 ft²Bigger

Bigger than 32% of homes nearby

Lot size0.21 ac
SmallerTypical 0.82 acBigger

Bigger than 8% of homes nearby

Year built1956
OlderTypical 1963Newer

Newer than 30% of homes nearby

How 280 S Balsamina Way ranks against every home in each area.
MeasureThis homeLaderaPortola Valley 94028San Mateo County
Estimated valuepricier than$2,989,30932% of homes24% of homes86% of homes
Price per ft²pricier than$128830% of homes29% of homes77% of homes
Living areabigger than2,320 ft²44% of homes32% of homes78% of homes
Lot sizebigger than0.21 ac15% of homes8% of homes71% of homes
Year builtnewer than195650% of homes30% of homes46% of homes

About 280 S Balsamina Way

How much is 280 S Balsamina Way, Portola Valley, CA worth?

The TopHap Estimate for 280 S Balsamina Way, Portola Valley, CA is $2,989,309 as of Sep 24, 2026. The likely range is $2,517,936 to $3,460,683. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 280 S Balsamina Way, Portola Valley, CA last sell?

280 S Balsamina Way, Portola Valley, CA last sold on May 19, 2020 for $2,900,000, according to the county's recorded deed.

How big is 280 S Balsamina Way, Portola Valley, CA?

280 S Balsamina Way, Portola Valley, CA has 4 bedrooms, 3 bathrooms, 2,320 square feet of living space and a 0.21-acre lot.

When was 280 S Balsamina Way, Portola Valley, CA built?

280 S Balsamina Way, Portola Valley, CA was built in 1956, making it 70 years old. It is a contemporary home. The building has 1 story.

What schools serve 280 S Balsamina Way, Portola Valley, CA?

280 S Balsamina Way, Portola Valley, CA is assigned to La Entrada School (middle), rated A+; Las Lomitas Elementary School (elementary), rated A+; Menlo-Atherton High School (high), rated A. All sit in Las Lomitas Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 280 S Balsamina Way, Portola Valley, CA compare to other homes in Portola Valley 94028?

Among the 2,380 homes in Portola Valley 94028, it is worth more than 24% of them ($2,989,309 against a typical $3,811,547), its price per square foot is higher than 29% of them ($1288 against a typical $1434), it is bigger than 32% of them (2,320 ft² against a typical 2,720 ft²), its lot is bigger than 8% of them (0.21 ac against a typical 0.82 ac) and it is newer than 30% of them (1956 against a typical 1963). Measured against all of San Mateo County, it is worth more than 86% 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 280 S Balsamina Way, Portola Valley, CA?

The 2025 property tax bill for 280 S Balsamina Way, Portola Valley, CA was $36,388. The county assessed it at $3,234,999.

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