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CondominiumResidential
$539,459$345 / 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 Aug 30, 2026
Last sold for $355,000 on Oct 2, 2018

21 ROSE LN

MOUNT SINAI, NY 11766
2
Beds
2
Baths
1,563 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.
1,742 ft²
Lot SizeThe size of the land the home sits on, from county records.
2006
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$539K
$514K low$565K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$355,000 · Oct 2, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,800 (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.$1,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$301,887

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.14 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.04
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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.Waterfront

Transaction History(4)

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
Mount Sinai Elementary SchoolB
Elementary · Grades KG–4 · 1.8 mi
M
Mount Sinai Middle SchoolA-
Middle · Grades 5–8 · 2.0 mi
H
Mount Sinai High SchoolA+
High · Grades 9–12 · 2.2 mi

District: Mount Sinai Union Free School District

Neighborhood · ZIP 11766These 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.47
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.106
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.65

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.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.7%
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.12,676
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,703 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$143,038
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,700
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.47 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 Rose Ln 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 88% of homes in Mount Sinai 11766
  • Costs less per square foot than 74% of homes in Suffolk County
  • Smaller than 76% of homes in Mount Sinai 11766
  • Among the smallest lots in Mount Sinai 11766
  • Newer than 94% of homes in Mount Sinai 11766

What homes are worth in Mount Sinai 11766

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

This home
$425K$1.3M

This home is worth more than 12% of homes in Mount Sinai 11766.

How it measures up in Mount Sinai 11766

The dot is this home. The mark in the middle is the typical home in Mount Sinai 11766.

Estimated value$539,459
CheaperTypical $743,823Pricier

Pricier than 12% of homes nearby

Price per ft²$345
CheaperTypical $352Pricier

Pricier than 46% of homes nearby

Living area1,563 ft²
SmallerTypical 2,138 ft²Bigger

Bigger than 24% of homes nearby

Lot size1,742 ft²
SmallerTypical 0.43 acBigger

Smaller than almost all homes nearby

Year built2006
OlderTypical 1985Newer

Newer than 94% of homes nearby

How 21 Rose Ln ranks against every home in each area.
MeasureThis homeMount Sinai 11766Suffolk County
Estimated valuepricier than$539,45912% of homes16% of homes
Price per ft²pricier than$34546% of homes26% of homes
Living areabigger than1,563 ft²24% of homes44% of homes
Lot sizebigger than1,742 ft²almost no homes3% of homes
Year builtnewer than200694% of homes94% of homes

About 21 Rose Ln

How much is 21 Rose Ln, Mount Sinai, NY worth?

The TopHap Estimate for 21 Rose Ln, Mount Sinai, NY is $539,459 as of Aug 30, 2026. The likely range is $513,913 to $565,005. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Rose Ln, Mount Sinai, NY last sell?

21 Rose Ln, Mount Sinai, NY last sold on Oct 2, 2018 for $355,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 Rose Ln, Mount Sinai, NY?

21 Rose Ln, Mount Sinai, NY has 2 bedrooms, 2 bathrooms, 1,563 square feet of living space and a 0.04-acre lot.

When was 21 Rose Ln, Mount Sinai, NY built?

21 Rose Ln, Mount Sinai, NY was built in 2006, making it 20 years old. It is a condo/apartment home. The building has 1 story.

What schools serve 21 Rose Ln, Mount Sinai, NY?

21 Rose Ln, Mount Sinai, NY is assigned to Mount Sinai Elementary School (elementary), rated B; Mount Sinai Middle School (middle), rated A-; Mount Sinai High School (high), rated A+. All sit in Mount Sinai Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Rose Ln, Mount Sinai, NY compare to other homes in Mount Sinai 11766?

Among the 4,442 homes in Mount Sinai 11766, it is worth more than 12% of them ($539,459 against a typical $743,823), its price per square foot is higher than 46% of them ($345 against a typical $352), it is bigger than 24% of them (1,563 ft² against a typical 2,138 ft²), its lot is bigger than almost none of them (1,742 ft² against a typical 0.43 ac) and it is newer than 94% of them (2006 against a typical 1985). Measured against all of Suffolk County, it is worth more than 16% 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 Rose Ln, Mount Sinai, NY?

The 2024 property tax bill for 21 Rose Ln, Mount Sinai, NY was $6,800. The county assessed it at $1,600.

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