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Duplex (2 Units, Any Combination)Residential
Last sold for $557,000 on Dec 26, 2008

21 CEDAR AVE

ROCKVILLE CENTRE, NY 11570
2
Baths
1,692 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.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
1905
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
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

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$557,000 · Dec 26, 2008

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,946 (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.$612 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$276
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$336
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$612
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$612,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
CountyNASSAU
Lot (acres)The size of the land the home sits on, from county records.0.14
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, 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.Deck · 132 ft²Patio · 132 ft²Porch · 162 ft²

Transaction History(1)

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
Southside Middle SchoolB+
Middle · Grades 6–8 · 0.3 mi
E
Floyd B. Watson Elementary SchoolA-
Elementary · Grades KG–5 · 0.4 mi
H
Southside High SchoolA
High · Grades 9–12 · 1.1 mi

District: Rockville Centre Union Free School District

Neighborhood · ZIP 11570These 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.82
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 100.91

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.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.6%
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.28,370
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,589 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$144,451
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$184,571
Average tempThe average temperature here across a full year.54°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 Cedar 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.

  • Smaller than 73% of homes in Rockville Centre 11570
  • Among the oldest homes in Nassau County

How it measures up in Rockville Centre 11570

The dot is this home. The mark in the middle is the typical home in Rockville Centre 11570.

Living area1,692 ft²
SmallerTypical 2,064 ft²Bigger

Bigger than 27% of homes nearby

Lot size0.14 ac
SmallerTypical 0.16 acBigger

Bigger than 38% of homes nearby

Year built1905
OlderTypical 1935Newer

Newer than 2% of homes nearby

How 21 Cedar Ave ranks against every home in each area.
MeasureThis homeRockville Centre 11570Nassau County
Living areabigger than1,692 ft²27% of homes48% of homes
Lot sizebigger than0.14 ac38% of homes46% of homes
Year builtnewer than19052% of homesalmost no homes

About 21 Cedar Ave

When did 21 Cedar Ave, Rockville Centre, NY last sell?

21 Cedar Ave, Rockville Centre, NY last sold on Dec 26, 2008 for $557,000, according to the county's recorded deed.

How big is 21 Cedar Ave, Rockville Centre, NY?

21 Cedar Ave, Rockville Centre, NY has 2 bathrooms, 1,692 square feet of living space and a 0.14-acre lot.

When was 21 Cedar Ave, Rockville Centre, NY built?

21 Cedar Ave, Rockville Centre, NY was built in 1905, making it 121 years old. The building has 2 stories.

What schools serve 21 Cedar Ave, Rockville Centre, NY?

21 Cedar Ave, Rockville Centre, NY is assigned to Southside Middle School (middle), rated B+; Floyd B. Watson Elementary School (elementary), rated A-; Southside High School (high), rated A. All sit in Rockville Centre Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Cedar Ave, Rockville Centre, NY compare to other homes in Rockville Centre 11570?

Among the 6,982 homes in Rockville Centre 11570, it is bigger than 27% of them (1,692 ft² against a typical 2,064 ft²), its lot is bigger than 38% of them (0.14 ac against a typical 0.16 ac) and it is newer than 2% of them (1905 against a typical 1935). 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 Cedar Ave, Rockville Centre, NY?

The 2025 property tax bill for 21 Cedar Ave, Rockville Centre, NY was $14,946. The county assessed it at $612.

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