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Single Family ResidenceResidential
$9,999,999$1,618 / 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 79How 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 $5,640,000 on Feb 27, 2004

230 VALPARAISO AVE

ATHERTON, CA 94027
5
Beds
5.5
Baths
6,181 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.
1.02 ac
Lot SizeThe size of the land the home sits on, from county records.
2003
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
13
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$10M
$10M low$10M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$5,640,000 · Feb 27, 2004

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$93,357 (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.$8,449,775 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$4,089,653
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$4,360,122
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$8,284,094
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$6,556,590

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.8 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

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
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

Transaction History(3)

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
Hillview Middle SchoolA+
Middle · Grades 6–8 · 0.4 mi
E
Oak Knoll Elementary SchoolA+
Elementary · Grades KG–5 · 1.0 mi
H
Menlo-Atherton High SchoolA
High · Grades 9–12 · 1.7 mi

District: Sequoia Union High 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

230 Valparaiso Ave 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.

  • Among the most valuable homes in West Atherton
  • Costs more per square foot than 91% of homes in San Mateo County
  • Bigger than 98% of homes in San Mateo County
  • Has a bigger lot than 88% of homes in San Mateo County
  • Newer than 95% 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
$2.7M$10M

This home is worth more than almost all 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$9,999,999
CheaperTypical $9,001,786Pricier

Pricier than almost all homes nearby

Price per ft²$1618
CheaperTypical $1980Pricier

Pricier than 27% of homes nearby

Living area6,181 ft²
SmallerTypical 3,930 ft²Bigger

Bigger than 77% of homes nearby

Lot size1.02 ac
SmallerTypical 1 acBigger

Bigger than 63% of homes nearby

Year built2003
OlderTypical 1958Newer

Newer than 81% of homes nearby

How 230 Valparaiso Ave ranks against every home in each area.
MeasureThis homeWest AthertonAtherton 94027San Mateo County
Estimated valuepricier than$9,999,999almost all homesalmost all homesalmost all homes
Price per ft²pricier than$161829% of homes27% of homes91% of homes
Living areabigger than6,181 ft²66% of homes77% of homes98% of homes
Lot sizebigger than1.02 ac56% of homes63% of homes88% of homes
Year builtnewer than200376% of homes81% of homes95% of homes

About 230 Valparaiso Ave

How much is 230 Valparaiso Ave, Atherton, CA worth?

The TopHap Estimate for 230 Valparaiso Ave, Atherton, CA is $9,999,999 as of Sep 24, 2026. The likely range is $9,999,999 to $9,999,999. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 230 Valparaiso Ave, Atherton, CA last sell?

230 Valparaiso Ave, Atherton, CA last sold on Feb 27, 2004 for $5,640,000, according to the county's recorded deed.

How big is 230 Valparaiso Ave, Atherton, CA?

230 Valparaiso Ave, Atherton, CA has 5 bedrooms, 5.5 bathrooms and 6,181 square feet of living space.

When was 230 Valparaiso Ave, Atherton, CA built?

230 Valparaiso Ave, Atherton, CA was built in 2003, making it 23 years old. The building has 2 stories.

What schools serve 230 Valparaiso Ave, Atherton, CA?

230 Valparaiso Ave, Atherton, CA is assigned to Hillview Middle School (middle), rated A+; Oak Knoll Elementary School (elementary), rated A+; Menlo-Atherton High School (high), rated A. All sit in Sequoia Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 230 Valparaiso Ave, Atherton, CA compare to other homes in Atherton 94027?

Among the 2,583 homes in Atherton 94027, it is worth more than almost all of them ($9,999,999 against a typical $9,001,786), its price per square foot is higher than 27% of them ($1618 against a typical $1980), it is bigger than 77% of them (6,181 ft² against a typical 3,930 ft²), its lot is bigger than 63% of them (1.02 ac against a typical 1 ac) and it is newer than 81% of them (2003 against a typical 1958). Measured against all of San Mateo County, it is worth more than almost all 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 230 Valparaiso Ave, Atherton, CA?

The 2025 property tax bill for 230 Valparaiso Ave, Atherton, CA was $93,357. The county assessed it at $8,449,775.

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