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Single Family ResidenceResidential
$5,280,000$669 / 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 Aug 30, 2026
Last sold for $5,180,000 on Jul 7, 2026

11 BLACK ROCK RD

MUTTONTOWN, NY 11791
7.5
Baths
7,890 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.
2 ac
Lot SizeThe size of the land the home sits on, from county records.
2005
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
11
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$5.3M
$4.8M low$5.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$5,180,000 · Jul 7, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$63,860 (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.$2,931 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$812
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$2,119
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$2,880
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,931,000

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.Colonial
CountyNASSAU
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
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.Yes
ViewThe type of view from the property, or another feature of the site that affects value.Private Road
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 1,500 ft²Porch · 36 ft²

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.

Neighborhood · ZIP 11791These 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.58
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.92

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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.25,701
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,064 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$180,785
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$232,702
Average tempThe average temperature here across a full year.52°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

11 Black Rock Rd 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.

  • Among the most valuable homes in Syosset 11791
  • Costs more per square foot than 87% of homes in Nassau County
  • Among the largest homes in Syosset 11791
  • Has a bigger lot than 98% of homes in Nassau County
  • Newer than 95% of homes in Nassau County

What homes are worth in Syosset 11791

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

This home
$807K$3.6M

This home is worth more than almost all homes in Syosset 11791.

How it measures up in Syosset 11791

The dot is this home. The mark in the middle is the typical home in Syosset 11791.

Estimated value$5,280,000
CheaperTypical $1,233,420Pricier

Pricier than almost all homes nearby

Price per ft²$669
CheaperTypical $615Pricier

Pricier than 73% of homes nearby

Living area7,890 ft²
SmallerTypical 2,047 ft²Bigger

Bigger than almost all homes nearby

Lot size2 ac
SmallerTypical 0.22 acBigger

Bigger than 89% of homes nearby

Year built2005
OlderTypical 1957Newer

Newer than 91% of homes nearby

How 11 Black Rock Rd ranks against every home in each area.
MeasureThis homeSyosset 11791Nassau County
Estimated valuepricier than$5,280,000almost all homesalmost all homes
Price per ft²pricier than$66973% of homes87% of homes
Living areabigger than7,890 ft²almost all homesalmost all homes
Lot sizebigger than2 ac89% of homes98% of homes
Year builtnewer than200591% of homes95% of homes

About 11 Black Rock Rd

How much is 11 Black Rock Rd, Muttontown, NY worth?

The TopHap Estimate for 11 Black Rock Rd, Muttontown, NY is $5,280,000 as of Aug 30, 2026. The likely range is $4,777,782 to $5,782,218. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 11 Black Rock Rd, Muttontown, NY last sell?

11 Black Rock Rd, Muttontown, NY last sold on Jul 7, 2026 for $5,180,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 11 Black Rock Rd, Muttontown, NY?

11 Black Rock Rd, Muttontown, NY has 7.5 bathrooms and 7,890 square feet of living space.

When was 11 Black Rock Rd, Muttontown, NY built?

11 Black Rock Rd, Muttontown, NY was built in 2005, making it 21 years old. It is a colonial home. The building has 2 stories.

How does 11 Black Rock Rd, Muttontown, NY compare to other homes in Syosset 11791?

Among the 8,086 homes in Syosset 11791, it is worth more than almost all of them ($5,280,000 against a typical $1,233,420), its price per square foot is higher than 73% of them ($669 against a typical $615), it is bigger than almost all of them (7,890 ft² against a typical 2,047 ft²), its lot is bigger than 89% of them (2 ac against a typical 0.22 ac) and it is newer than 91% of them (2005 against a typical 1957). Measured against all of Nassau County, it is worth more than almost all 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 11 Black Rock Rd, Muttontown, NY?

The 2025 property tax bill for 11 Black Rock Rd, Muttontown, NY was $63,860. The county assessed it at $2,931.

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