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Single Family ResidenceResidential
$629,000$524 / 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 95How 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 $562,000 on Mar 21, 2024

21 ROBERT AVE

MASSAPEQUA, NY 11758
1.5
Baths
1,201 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.
0.15 ac
Lot SizeThe size of the land the home sits on, from county records.
1954
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
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

$629K
$600K low$658K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$562,000 · Mar 21, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,808 (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.$356 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$144
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$212
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$345
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$356,000

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.Cape Cod
CountyNASSAU
Lot (acres)The size of the land the home sits on, from county records.0.15
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 36 ft²

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.

Foreclosure Filings(1)

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

E
Northwest Elementary School
Elementary · Grades KG–2 · 0.5 mi
M
Edmund W. Miles Middle SchoolC-
Middle · Grades 6–8 · 0.9 mi
H
Amityville Memorial High SchoolD+
High · Grades 9–12 · 2.2 mi

District: Amityville Union Free School District

Neighborhood · ZIP 11758These 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.73
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.112
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.87

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.6%
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.52,377
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,214 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$147,367
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$180,932
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.56%

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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 Robert 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 less than 89% of homes in Massapequa 11758
  • Costs more per square foot than 79% of homes in East Massapequa
  • Smaller than 88% of homes in East Massapequa
  • Has a smaller lot than 71% of homes in East Massapequa

What homes are worth in Massapequa 11758

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

This home
$546K$1.5M

This home is worth more than 11% of homes in Massapequa 11758.

How it measures up in Massapequa 11758

The dot is this home. The mark in the middle is the typical home in Massapequa 11758.

Estimated value$629,000
CheaperTypical $786,627Pricier

Pricier than 11% of homes nearby

Price per ft²$524
CheaperTypical $474Pricier

Pricier than 73% of homes nearby

Living area1,201 ft²
SmallerTypical 1,720 ft²Bigger

Bigger than 13% of homes nearby

Lot size0.15 ac
SmallerTypical 0.16 acBigger

Bigger than 33% of homes nearby

Year built1954
OlderTypical 1956Newer

Newer than 47% of homes nearby

How 21 Robert Ave ranks against every home in each area.
MeasureThis homeEast MassapequaMassapequa 11758Nassau County
Estimated valuepricier than$629,00018% of homes11% of homes11% of homes
Price per ft²pricier than$52479% of homes73% of homes52% of homes
Living areabigger than1,201 ft²12% of homes13% of homes13% of homes
Lot sizebigger than0.15 ac29% of homes33% of homes51% of homes
Year builtnewer than195442% of homes47% of homes61% of homes

About 21 Robert Ave

How much is 21 Robert Ave, Massapequa, NY worth?

The TopHap Estimate for 21 Robert Ave, Massapequa, NY is $629,000 as of Sep 24, 2026. The likely range is $599,508 to $658,492. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Robert Ave, Massapequa, NY last sell?

21 Robert Ave, Massapequa, NY last sold on Mar 21, 2024 for $562,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Robert Ave, Massapequa, NY?

21 Robert Ave, Massapequa, NY has 1.5 bathrooms, 1,201 square feet of living space and a 0.15-acre lot.

When was 21 Robert Ave, Massapequa, NY built?

21 Robert Ave, Massapequa, NY was built in 1954, making it 72 years old. It is a cape cod home. The building has 1 story.

What schools serve 21 Robert Ave, Massapequa, NY?

21 Robert Ave, Massapequa, NY is assigned to Northwest Elementary School (elementary); Edmund W. Miles Middle School (middle), rated C-; Amityville Memorial High School (high), rated D+. All sit in Amityville Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Robert Ave, Massapequa, NY compare to other homes in Massapequa 11758?

Among the 17,560 homes in Massapequa 11758, it is worth more than 11% of them ($629,000 against a typical $786,627), its price per square foot is higher than 73% of them ($524 against a typical $474), it is bigger than 13% of them (1,201 ft² against a typical 1,720 ft²), its lot is bigger than 33% of them (0.15 ac against a typical 0.16 ac) and it is newer than 47% of them (1954 against a typical 1956). Measured against all of Nassau County, it is worth more than 11% 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 Robert Ave, Massapequa, NY?

The 2025 property tax bill for 21 Robert Ave, Massapequa, NY was $10,808. The county assessed it at $356.

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