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Single Family ResidenceResidential
$9,999,999$807 / 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 $7,150,000 on Oct 15, 2012

21 ELM ROCK RD

BRONXVILLE, NY 10708
8
Beds
11.5
Baths
12,396 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.
1.68 ac
Lot SizeThe size of the land the home sits on, from county records.
1927
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
14
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$10M
$9.7M 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.$7,150,000 · Oct 15, 2012

Tax & Assessment

Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$11,014,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$2,430,260
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$8,584,640
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$10,665,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$11,014,900

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.41
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
8
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
67
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
83
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
49
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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
StyleThe architectural style of the home, such as ranch or colonial.Mansion
CountyWESTCHESTER
Lot (acres)The size of the land the home sits on, from county records.1.68
HeatingThe type of heating system in the home.Hot Water
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, Attached
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.

H
Bronxville High SchoolA+
High · Grades 9–12 · 0.4 mi
E
Bronxville Elementary SchoolA+
Elementary · Grades KG–7 · 0.4 mi
M
Bronxville Middle SchoolA+
Middle · Grades 6–8 · 0.4 mi

District: Bronxville Union Free School District

Neighborhood · ZIP 10708These 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.84
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.117
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.115

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.2%
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.21,885
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,241 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$148,722
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$204,972
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.55%

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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

21 Elm Rock Rd 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 Bronxville 10708
  • Costs more per square foot than 91% of homes in Westchester County
  • Among the largest homes in Westchester County
  • Has a bigger lot than 98% of homes in Bronxville 10708
  • Older than 77% of homes in Westchester County

What homes are worth in Bronxville 10708

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

This home
$374K$5.7M

This home is worth more than almost all homes in Bronxville 10708.

How it measures up in Bronxville 10708

The dot is this home. The mark in the middle is the typical home in Bronxville 10708.

Estimated value$9,999,999
CheaperTypical $1,265,380Pricier

Pricier than almost all homes nearby

Price per ft²$807
CheaperTypical $671Pricier

Pricier than 62% of homes nearby

Living area12,396 ft²
SmallerTypical 2,556 ft²Bigger

Bigger than 95% of homes nearby

Lot size1.68 ac
SmallerTypical 0.18 acBigger

Bigger than 98% of homes nearby

Year built1927
OlderTypical 1929Newer

Newer than 44% of homes nearby

How 21 Elm Rock Rd ranks against every home in each area.
MeasureThis homeBronxville 10708Westchester County
Estimated valuepricier than$9,999,999almost all homesalmost all homes
Price per ft²pricier than$80762% of homes91% of homes
Living areabigger than12,396 ft²95% of homesalmost all homes
Lot sizebigger than1.68 ac98% of homes93% of homes
Year builtnewer than192744% of homes23% of homes

About 21 Elm Rock Rd

How much is 21 Elm Rock Rd, Bronxville, NY worth?

The TopHap Estimate for 21 Elm Rock Rd, Bronxville, NY is $9,999,999 as of Sep 24, 2026. The likely range is $9,736,845 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 21 Elm Rock Rd, Bronxville, NY last sell?

21 Elm Rock Rd, Bronxville, NY last sold on Oct 15, 2012 for $7,150,000, according to the county's recorded deed.

How big is 21 Elm Rock Rd, Bronxville, NY?

21 Elm Rock Rd, Bronxville, NY has 8 bedrooms, 11.5 bathrooms, 12,396 square feet of living space and a 1.68-acre lot.

When was 21 Elm Rock Rd, Bronxville, NY built?

21 Elm Rock Rd, Bronxville, NY was built in 1927, making it 99 years old. It is a mansion home. The building has 2 stories.

What schools serve 21 Elm Rock Rd, Bronxville, NY?

21 Elm Rock Rd, Bronxville, NY is assigned to Bronxville High School (high), rated A+; Bronxville Elementary School (elementary), rated A+; Bronxville Middle School (middle), rated A+. All sit in Bronxville Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Elm Rock Rd, Bronxville, NY compare to other homes in Bronxville 10708?

Among the 4,458 homes in Bronxville 10708, it is worth more than almost all of them ($9,999,999 against a typical $1,265,380), its price per square foot is higher than 62% of them ($807 against a typical $671), it is bigger than 95% of them (12,396 ft² against a typical 2,556 ft²), its lot is bigger than 98% of them (1.68 ac against a typical 0.18 ac) and it is newer than 44% of them (1927 against a typical 1929). Measured against all of Westchester 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.

More homes on Elm Rock Rd

Closest homes

More homes in Bronxville 10708

Assigned schools

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