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Single Family ResidenceResidential
$868,244$373 / 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 93How 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

21 CORNELL DR S

COMMACK, NY 11725
4
Beds
2.5
Baths
2,329 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.
0.28 ac
Lot SizeThe size of the land the home sits on, from county records.
1975
Year BuiltThe year the home was originally built, according to county records.
2
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$868K
$804K low$932K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,145 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$5,890 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$5,590
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$736,250

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.Colonial
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.28
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.No
ViewThe type of view from the property, or another feature of the site that affects value.Suburban

Transaction History(2)

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

Neighborhood · ZIP 11725These 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.42
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.75

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.98%
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.2.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.29,060
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,956 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$164,054
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$187,880
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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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 Cornell Dr S 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 72% of homes in Commack 11725
  • Costs less per square foot than 93% of homes in Commack 11725
  • Bigger than 79% of homes in Suffolk County
  • Newer than 81% of homes in Commack 11725

What homes are worth in Commack 11725

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

This home
$589K$1.3M

This home is worth more than 72% of homes in Commack 11725.

How it measures up in Commack 11725

The dot is this home. The mark in the middle is the typical home in Commack 11725.

Estimated value$868,244
CheaperTypical $780,259Pricier

Pricier than 72% of homes nearby

Price per ft²$373
CheaperTypical $475Pricier

Pricier than 7% of homes nearby

Living area2,329 ft²
SmallerTypical 1,815 ft²Bigger

Bigger than 77% of homes nearby

Lot size0.28 ac
SmallerTypical 0.26 acBigger

Bigger than 57% of homes nearby

Year built1975
OlderTypical 1963Newer

Newer than 81% of homes nearby

How 21 Cornell Dr S ranks against every home in each area.
MeasureThis homeCommack 11725Suffolk County
Estimated valuepricier than$868,24472% of homes72% of homes
Price per ft²pricier than$3737% of homes36% of homes
Living areabigger than2,329 ft²77% of homes79% of homes
Lot sizebigger than0.28 ac57% of homes51% of homes
Year builtnewer than197581% of homes61% of homes

About 21 Cornell Dr S

How much is 21 Cornell Dr S, Commack, NY worth?

The TopHap Estimate for 21 Cornell Dr S, Commack, NY is $868,244 as of Sep 24, 2026. The likely range is $804,208 to $932,280. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Cornell Dr S, Commack, NY last sell?

21 Cornell Dr S, Commack, NY last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Cornell Dr S, Commack, NY?

21 Cornell Dr S, Commack, NY has 4 bedrooms, 2.5 bathrooms, 2,329 square feet of living space and a 0.28-acre lot.

When was 21 Cornell Dr S, Commack, NY built?

21 Cornell Dr S, Commack, NY was built in 1975, making it 51 years old. It is a colonial home. The building has 2 stories.

How does 21 Cornell Dr S, Commack, NY compare to other homes in Commack 11725?

Among the 9,143 homes in Commack 11725, it is worth more than 72% of them ($868,244 against a typical $780,259), its price per square foot is higher than 7% of them ($373 against a typical $475), it is bigger than 77% of them (2,329 ft² against a typical 1,815 ft²), its lot is bigger than 57% of them (0.28 ac against a typical 0.26 ac) and it is newer than 81% of them (1975 against a typical 1963). Measured against all of Suffolk County, it is worth more than 72% 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 21 Cornell Dr S, Commack, NY?

The 2024 property tax bill for 21 Cornell Dr S, Commack, NY was $15,145. The county assessed it at $5,890.

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