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Single Family ResidenceResidential
$875,249$518 / 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 97How 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 $450,000 on Jul 8, 2008

423 CORNWELL AVE

MALVERNE, NY 11565
2 / 2
Baths
1,691 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.
1956
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
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

$875K
$847K low$903K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$450,000 · Jul 8, 2008
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$483,399
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$386,719
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.46%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$391,850
QUICKEN LOANS INC · R · recorded Mar 7, 2013

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,407 (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.$471 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$208
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$263
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$518
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$471,000

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.Split Level
CountyNASSAU
Lot (acres)The size of the land the home sits on, from county records.0.20
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, Attached
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 · 350 ft²Patio · 171 ft²Porch · 63 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
Valley Stream Memorial Junior High SchoolC+
Middle · Grades 7–9 · 1.1 mi
H
Valley Stream Central High SchoolA-
High · Grades 10–12 · 1.1 mi

District: Valley Stream Central High School District

Neighborhood · ZIP 11565These 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.53
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.111
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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.7%
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.8,481
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,778 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$164,360
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$184,712
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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

423 Cornwell 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.

  • Worth more than 77% of homes in Malverne 11565
  • Costs more per square foot than 71% of homes in Malverne 11565
  • Has a bigger lot than 92% of homes in Malverne 11565
  • Newer than 88% of homes in Malverne 11565

What homes are worth in Malverne 11565

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

This home
$613K$1.1M

This home is worth more than 77% of homes in Malverne 11565.

How it measures up in Malverne 11565

The dot is this home. The mark in the middle is the typical home in Malverne 11565.

Estimated value$875,249
CheaperTypical $795,504Pricier

Pricier than 77% of homes nearby

Price per ft²$518
CheaperTypical $484Pricier

Pricier than 71% of homes nearby

Living area1,691 ft²
SmallerTypical 1,624 ft²Bigger

Bigger than 56% of homes nearby

Lot size0.2 ac
SmallerTypical 0.13 acBigger

Bigger than 92% of homes nearby

Year built1956
OlderTypical 1941Newer

Newer than 88% of homes nearby

How 423 Cornwell Ave ranks against every home in each area.
MeasureThis homeMalverne 11565Nassau County
Estimated valuepricier than$875,24977% of homes56% of homes
Price per ft²pricier than$51871% of homes49% of homes
Living areabigger than1,691 ft²56% of homes48% of homes
Lot sizebigger than0.2 ac92% of homes76% of homes
Year builtnewer than195688% of homes68% of homes

About 423 Cornwell Ave

How much is 423 Cornwell Ave, Malverne, NY worth?

The TopHap Estimate for 423 Cornwell Ave, Malverne, NY is $875,249 as of Jul 14, 2026. The likely range is $847,295 to $903,203. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 423 Cornwell Ave, Malverne, NY last sell?

423 Cornwell Ave, Malverne, NY last sold on Jul 8, 2008 for $450,000, according to the county's recorded deed.

How big is 423 Cornwell Ave, Malverne, NY?

423 Cornwell Ave, Malverne, NY has 2 bathrooms, 1,691 square feet of living space and a 0.20-acre lot.

When was 423 Cornwell Ave, Malverne, NY built?

423 Cornwell Ave, Malverne, NY was built in 1956, making it 70 years old. It is a split level home. The building has 1 story.

What schools serve 423 Cornwell Ave, Malverne, NY?

423 Cornwell Ave, Malverne, NY is assigned to Valley Stream Memorial Junior High School (middle), rated C+; Valley Stream Central High School (high), rated A-. All sit in Valley Stream Central High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 423 Cornwell Ave, Malverne, NY compare to other homes in Malverne 11565?

Among the 3,128 homes in Malverne 11565, it is worth more than 77% of them ($875,249 against a typical $795,504), its price per square foot is higher than 71% of them ($518 against a typical $484), it is bigger than 56% of them (1,691 ft² against a typical 1,624 ft²), its lot is bigger than 92% of them (0.2 ac against a typical 0.13 ac) and it is newer than 88% of them (1956 against a typical 1941). Measured against all of Nassau County, it is worth more than 56% 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 423 Cornwell Ave, Malverne, NY?

The 2025 property tax bill for 423 Cornwell Ave, Malverne, NY was $8,407. The county assessed it at $471.

More homes on Cornwell Ave

Closest homes

More homes in Malverne 11565

Assigned schools

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