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Single Family ResidenceResidential
$616,195$615 / 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 Jul 14, 2026
Last sold for $257,500 on Aug 25, 2015

21 ROSLYN ST

ISLIP TERRACE, NY 11752
0
Baths
1,002 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.
0.2 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.

Valuation

$616K
$576K low$657K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$257,500 · Aug 25, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,899 (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.$29,250 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$6,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$22,350
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$411,972

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.20
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

Foreclosure Filings(1)

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

H
East Islip High SchoolA
High · Grades 9–12 · 0.6 mi
M
East Islip Middle SchoolC+
Middle · Grades 6–8 · 0.6 mi
E
Connetquot Elementary School
Elementary · Grades KG–2 · 1.2 mi

District: East Islip Union Free School District

Neighborhood · ZIP 11752These 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.43
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 100.68

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.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.2%
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.9,076
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,454 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$142,239
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$153,915
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%

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 Roslyn St 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 69% of homes in Suffolk County
  • Costs more per square foot than 89% of homes in Islip Terrace 11752
  • Smaller than 94% of homes in Islip Terrace 11752
  • Has a smaller lot than 79% of homes in Islip Terrace 11752
  • Older than 96% of homes in Suffolk County

What homes are worth in Islip Terrace 11752

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

This home
$508K$909K

This home is worth more than 32% of homes in Islip Terrace 11752.

How it measures up in Islip Terrace 11752

The dot is this home. The mark in the middle is the typical home in Islip Terrace 11752.

Estimated value$616,195
CheaperTypical $655,274Pricier

Pricier than 32% of homes nearby

Price per ft²$615
CheaperTypical $447Pricier

Pricier than 89% of homes nearby

Living area1,002 ft²
SmallerTypical 1,598 ft²Bigger

Bigger than 6% of homes nearby

Lot size0.2 ac
SmallerTypical 0.27 acBigger

Bigger than 21% of homes nearby

Year built1927
OlderTypical 1963Newer

Newer than 12% of homes nearby

How 21 Roslyn St ranks against every home in each area.
MeasureThis homeIslip TerraceIslip Terrace 11752Suffolk County
Estimated valuepricier than$616,19536% of homes32% of homes31% of homes
Price per ft²pricier than$61588% of homes89% of homes85% of homes
Living areabigger than1,002 ft²7% of homes6% of homes11% of homes
Lot sizebigger than0.2 ac29% of homes21% of homes29% of homes
Year builtnewer than192720% of homes12% of homes4% of homes

About 21 Roslyn St

How much is 21 Roslyn St, Islip Terrace, NY worth?

The TopHap Estimate for 21 Roslyn St, Islip Terrace, NY is $616,195 as of Jul 14, 2026. The likely range is $575,711 to $656,679. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Roslyn St, Islip Terrace, NY last sell?

21 Roslyn St, Islip Terrace, NY last sold on Aug 25, 2015 for $257,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Roslyn St, Islip Terrace, NY?

21 Roslyn St, Islip Terrace, NY has 1,002 square feet of living space and a 0.20-acre lot.

When was 21 Roslyn St, Islip Terrace, NY built?

21 Roslyn St, Islip Terrace, NY was built in 1927, making it 99 years old.

What schools serve 21 Roslyn St, Islip Terrace, NY?

21 Roslyn St, Islip Terrace, NY is assigned to East Islip High School (high), rated A; East Islip Middle School (middle), rated C+; Connetquot Elementary School (elementary). All sit in East Islip Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Roslyn St, Islip Terrace, NY compare to other homes in Islip Terrace 11752?

Among the 2,901 homes in Islip Terrace 11752, it is worth more than 32% of them ($616,195 against a typical $655,274), its price per square foot is higher than 89% of them ($615 against a typical $447), it is bigger than 6% of them (1,002 ft² against a typical 1,598 ft²), its lot is bigger than 21% of them (0.2 ac against a typical 0.27 ac) and it is newer than 12% of them (1927 against a typical 1963). Measured against all of Suffolk County, it is worth more than 31% 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 Roslyn St, Islip Terrace, NY?

The 2024 property tax bill for 21 Roslyn St, Islip Terrace, NY was $8,899. The county assessed it at $29,250.

More homes on Roslyn St

Closest homes

More homes in Islip Terrace 11752

Assigned schools

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