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Single Family ResidenceResidential
$742,833$737 / 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 90How 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 $700,000 on Jul 15, 2025

21 CALAM AVE

OSSINING, NY 10562
3
Beds
1
Baths
1,008 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.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1930
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
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

$743K
$666K low$820K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$700,000 · Jul 15, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,723 (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.$553,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$267,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$285,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$555,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$553,100

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.37
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
5
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
68
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
96
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
16
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.Traditional/Old
CountyWESTCHESTER
Lot (acres)The size of the land the home sits on, from county records.0.16
HeatingThe type of heating system in the home.Hot Water
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 224 ft²Porch · 290 ft²

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.

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

M
Anne M. Dorner Middle SchoolC
Middle · Grades 6–8 · 0.8 mi
E
Brookside School
Elementary · Grades 1–2 · 0.8 mi
H
Ossining High SchoolC-
High · Grades 9–12 · 0.9 mi

District: Ossining Union Free School District

Neighborhood · ZIP 10562These 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.72
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.107
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.109

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.1%
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.31,317
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,164 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,343
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$154,080
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.50 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 Calam 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.

  • Worth more than 67% of homes in Ossining 10562
  • Among the highest price per square foot in Ossining 10562
  • Smaller than 95% of homes in Westchester County
  • Older than 71% of homes in Westchester County

What homes are worth in Ossining 10562

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

This home
$377K$1.5M

This home is worth more than 67% of homes in Ossining 10562.

How it measures up in Ossining 10562

The dot is this home. The mark in the middle is the typical home in Ossining 10562.

Estimated value$742,833
CheaperTypical $648,542Pricier

Pricier than 67% of homes nearby

Price per ft²$737
CheaperTypical $409Pricier

Pricier than almost all homes nearby

Living area1,008 ft²
SmallerTypical 1,660 ft²Bigger

Bigger than 6% of homes nearby

Lot size0.16 ac
SmallerTypical 0.17 acBigger

Bigger than 50% of homes nearby

Year built1930
OlderTypical 1955Newer

Newer than 34% of homes nearby

How 21 Calam Ave ranks against every home in each area.
MeasureThis homeOssining 10562Westchester County
Estimated valuepricier than$742,83367% of homes36% of homes
Price per ft²pricier than$737almost all homes86% of homes
Living areabigger than1,008 ft²6% of homes5% of homes
Lot sizebigger than0.16 ac50% of homes40% of homes
Year builtnewer than193034% of homes29% of homes

About 21 Calam Ave

How much is 21 Calam Ave, Ossining, NY worth?

The TopHap Estimate for 21 Calam Ave, Ossining, NY is $742,833 as of Sep 24, 2026. The likely range is $666,118 to $819,548. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Calam Ave, Ossining, NY last sell?

21 Calam Ave, Ossining, NY last sold on Jul 15, 2025 for $700,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Calam Ave, Ossining, NY?

21 Calam Ave, Ossining, NY has 3 bedrooms, 1 bathrooms, 1,008 square feet of living space and a 0.16-acre lot.

When was 21 Calam Ave, Ossining, NY built?

21 Calam Ave, Ossining, NY was built in 1930, making it 96 years old. It is a traditional/old home. The building has 1 story.

What schools serve 21 Calam Ave, Ossining, NY?

21 Calam Ave, Ossining, NY is assigned to Anne M. Dorner Middle School (middle), rated C; Brookside School (elementary); Ossining High School (high), rated C-. All sit in Ossining Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Calam Ave, Ossining, NY compare to other homes in Ossining 10562?

Among the 7,619 homes in Ossining 10562, it is worth more than 67% of them ($742,833 against a typical $648,542), its price per square foot is higher than almost all of them ($737 against a typical $409), it is bigger than 6% of them (1,008 ft² against a typical 1,660 ft²), its lot is bigger than 50% of them (0.16 ac against a typical 0.17 ac) and it is newer than 34% of them (1930 against a typical 1955). Measured against all of Westchester County, it is worth more than 36% 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 Calam Ave, Ossining, NY?

The 2025 property tax bill for 21 Calam Ave, Ossining, NY was $11,723. The county assessed it at $553,100.

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