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Single Family ResidenceResidential
$814,742$476 / 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 94How 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

21 SACHEM ST

EAST ROCKAWAY, NY 11518
1.5
Baths
1,710 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.
1926
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$815K
$765K low$864K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,216 (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.$510 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$213
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$297
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$532
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$510,000

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.12 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.26%
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.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Colonial
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)
RoofThe main material covering the roof, such as asphalt shingle or tile.Wood Shingle
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, 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.Porch · 199 ft²

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

E
Marion Street SchoolA
Elementary · Grades 1–5 · 0.1 mi
M
Lynbrook South Middle SchoolA
Middle · Grades 6–8 · 0.6 mi
H
Lynbrook Senior High SchoolA-
High · Grades 9–12 · 0.6 mi

District: Lynbrook Union Free School District

Neighborhood · ZIP 11518These 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.119
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.113
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.95

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.26%
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.10,947
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,163 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$108,669
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,163
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 Sachem 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 more than 68% of homes in East Rockaway 11518
  • Costs more per square foot than 69% of homes in East Rockaway 11518
  • Older than 89% of homes in Nassau County

What homes are worth in East Rockaway 11518

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

This home
$371K$1.3M

This home is worth more than 68% of homes in East Rockaway 11518.

How it measures up in East Rockaway 11518

The dot is this home. The mark in the middle is the typical home in East Rockaway 11518.

Estimated value$814,742
CheaperTypical $730,954Pricier

Pricier than 68% of homes nearby

Price per ft²$476
CheaperTypical $440Pricier

Pricier than 69% of homes nearby

Living area1,710 ft²
SmallerTypical 1,719 ft²Bigger

Bigger than 50% of homes nearby

Lot size0.14 ac
SmallerTypical 0.13 acBigger

Bigger than 59% of homes nearby

Year built1926
OlderTypical 1942Newer

Newer than 31% of homes nearby

How 21 Sachem St ranks against every home in each area.
MeasureThis homeEast Rockaway 11518Nassau County
Estimated valuepricier than$814,74268% of homes48% of homes
Price per ft²pricier than$47669% of homes35% of homes
Living areabigger than1,710 ft²50% of homes49% of homes
Lot sizebigger than0.14 ac59% of homes47% of homes
Year builtnewer than192631% of homes11% of homes

About 21 Sachem St

How much is 21 Sachem St, East Rockaway, NY worth?

The TopHap Estimate for 21 Sachem St, East Rockaway, NY is $814,742 as of Sep 24, 2026. The likely range is $765,357 to $864,127. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Sachem St, East Rockaway, NY last sell?

21 Sachem St, East Rockaway, NY last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Sachem St, East Rockaway, NY?

21 Sachem St, East Rockaway, NY has 1.5 bathrooms, 1,710 square feet of living space and a 0.14-acre lot.

When was 21 Sachem St, East Rockaway, NY built?

21 Sachem St, East Rockaway, NY was built in 1926, making it 100 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Sachem St, East Rockaway, NY?

21 Sachem St, East Rockaway, NY is assigned to Marion Street School (elementary), rated A; Lynbrook South Middle School (middle), rated A; Lynbrook Senior High School (high), rated A-. All sit in Lynbrook Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Sachem St, East Rockaway, NY compare to other homes in East Rockaway 11518?

Among the 3,435 homes in East Rockaway 11518, it is worth more than 68% of them ($814,742 against a typical $730,954), its price per square foot is higher than 69% of them ($476 against a typical $440), it is bigger than 50% of them (1,710 ft² against a typical 1,719 ft²), its lot is bigger than 59% of them (0.14 ac against a typical 0.13 ac) and it is newer than 31% of them (1926 against a typical 1942). Measured against all of Nassau County, it is worth more than 48% 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 Sachem St, East Rockaway, NY?

The 2025 property tax bill for 21 Sachem St, East Rockaway, NY was $12,216. The county assessed it at $510.

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