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Single Family ResidenceResidential
$1,292,579$431 / 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 88How 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 $38,500 on Aug 22, 1974

1099 PROSPECT AVE

MOUNTAINSIDE, NJ 07092
0
Baths
2,996 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.
0.61 ac
Lot SizeThe size of the land the home sits on, from county records.
1976
Year BuiltThe year the home was originally built, according to county records.

Valuation

$1.3M
$1.1M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$38,500 · Aug 22, 1974

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$17,882 (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.$851,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$344,200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$507,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$851,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$851,500

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyUNION
Lot (acres)The size of the land the home sits on, from county records.0.61
PoolWhether the property has a pool, and what kind, such as in-ground.No

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

M
Deerfield Elementary SchoolA
Middle · Grades 3–8 · 0.7 mi
E
Beechwood School
Elementary · Grades PK–2 · 1.5 mi
H
Governor Livingston High SchoolA-
High · Grades 9–12 · 1.7 mi

District: Berkeley Heights Township School District

Neighborhood · ZIP 07092These 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.63
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.113

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.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.7,481
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,781 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$152,285
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$207,319
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.50 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

1099 Prospect 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 92% of homes in Union County
  • Bigger than 88% of homes in Union County
  • Has a bigger lot than 95% of homes in Union County
  • Newer than 85% of homes in Mountainside 07092

What homes are worth in Mountainside 07092

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

This home
$613K$1.8M

This home is worth more than 84% of homes in Mountainside 07092.

How it measures up in Mountainside 07092

The dot is this home. The mark in the middle is the typical home in Mountainside 07092.

Estimated value$1,292,579
CheaperTypical $982,464Pricier

Pricier than 84% of homes nearby

Price per ft²$431
CheaperTypical $425Pricier

Pricier than 55% of homes nearby

Living area2,996 ft²
SmallerTypical 2,346 ft²Bigger

Bigger than 78% of homes nearby

Lot size0.61 ac
SmallerTypical 0.36 acBigger

Bigger than 90% of homes nearby

Year built1976
OlderTypical 1956Newer

Newer than 85% of homes nearby

How 1099 Prospect Ave ranks against every home in each area.
MeasureThis homeMountainside 07092Union County
Estimated valuepricier than$1,292,57984% of homes92% of homes
Price per ft²pricier than$43155% of homes60% of homes
Living areabigger than2,996 ft²78% of homes88% of homes
Lot sizebigger than0.61 ac90% of homes95% of homes
Year builtnewer than197685% of homes85% of homes

About 1099 Prospect Ave

How much is 1099 Prospect Ave, Mountainside, NJ worth?

The TopHap Estimate for 1099 Prospect Ave, Mountainside, NJ is $1,292,579 as of Aug 30, 2026. The likely range is $1,135,439 to $1,449,719. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1099 Prospect Ave, Mountainside, NJ last sell?

1099 Prospect Ave, Mountainside, NJ last sold on Aug 22, 1974 for $38,500, according to the county's recorded deed.

How big is 1099 Prospect Ave, Mountainside, NJ?

1099 Prospect Ave, Mountainside, NJ has 2,996 square feet of living space and a 0.61-acre lot.

When was 1099 Prospect Ave, Mountainside, NJ built?

1099 Prospect Ave, Mountainside, NJ was built in 1976, making it 50 years old.

What schools serve 1099 Prospect Ave, Mountainside, NJ?

1099 Prospect Ave, Mountainside, NJ is assigned to Deerfield Elementary School (middle), rated A; Beechwood School (elementary); Governor Livingston High School (high), rated A-. All sit in Berkeley Heights Township School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1099 Prospect Ave, Mountainside, NJ compare to other homes in Mountainside 07092?

Among the 2,581 homes in Mountainside 07092, it is worth more than 84% of them ($1,292,579 against a typical $982,464), its price per square foot is higher than 55% of them ($431 against a typical $425), it is bigger than 78% of them (2,996 ft² against a typical 2,346 ft²), its lot is bigger than 90% of them (0.61 ac against a typical 0.36 ac) and it is newer than 85% of them (1976 against a typical 1956). Measured against all of Union County, it is worth more than 92% 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 1099 Prospect Ave, Mountainside, NJ?

The 2025 property tax bill for 1099 Prospect Ave, Mountainside, NJ was $17,882. The county assessed it at $851,500.

More homes on Prospect Ave

Closest homes

More homes in Mountainside 07092

Assigned schools

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