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Single Family ResidenceResidential
$1,333,058$352 / 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 Sep 24, 2026

399 PARK SLOPE

MOUNTAINSIDE, NJ 07092
0
Baths
3,792 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.
0.5 ac
Lot SizeThe size of the land the home sits on, from county records.
1965
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.3M
$1.2M low$1.5M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,855 (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.$755,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$344,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$410,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$755,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$755,000

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.0.50
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

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.

E
Beechwood School
Elementary · Grades PK–2 · 0.6 mi
M
Deerfield Elementary SchoolA+
Middle · Grades 3–8 · 0.9 mi
H
Governor Livingston High SchoolB+
High · Grades 9–12 · 1.1 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

399 Park Slope 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 93% of homes in Union County
  • Costs less per square foot than 95% of homes in Mountainside 07092
  • Bigger than 95% of homes in Union County
  • Has a bigger lot than 93% of homes in Union County
  • Newer than 80% of homes in Union County

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
$649K$1.8M

This home is worth more than 85% 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$1,333,058
CheaperTypical $1,014,405Pricier

Pricier than 85% of homes nearby

Price per ft²$352
CheaperTypical $438Pricier

Pricier than 5% of homes nearby

Living area3,792 ft²
SmallerTypical 2,340 ft²Bigger

Bigger than 93% of homes nearby

Lot size0.5 ac
SmallerTypical 0.36 acBigger

Bigger than 83% of homes nearby

Year built1965
OlderTypical 1956Newer

Newer than 79% of homes nearby

How 399 Park Slope ranks against every home in each area.
MeasureThis homeMountainside 07092Union County
Estimated valuepricier than$1,333,05885% of homes93% of homes
Price per ft²pricier than$3525% of homes32% of homes
Living areabigger than3,792 ft²93% of homes95% of homes
Lot sizebigger than0.5 ac83% of homes93% of homes
Year builtnewer than196579% of homes80% of homes

About 399 Park Slope

How much is 399 Park Slope, Mountainside, NJ worth?

The TopHap Estimate for 399 Park Slope, Mountainside, NJ is $1,333,058 as of Sep 24, 2026. The likely range is $1,197,475 to $1,468,641. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 399 Park Slope, Mountainside, NJ last sell?

399 Park Slope, Mountainside, NJ last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 399 Park Slope, Mountainside, NJ?

399 Park Slope, Mountainside, NJ has 3,792 square feet of living space and a 0.50-acre lot.

When was 399 Park Slope, Mountainside, NJ built?

399 Park Slope, Mountainside, NJ was built in 1965, making it 61 years old. The building has 1 story.

What schools serve 399 Park Slope, Mountainside, NJ?

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

How does 399 Park Slope, Mountainside, NJ compare to other homes in Mountainside 07092?

Among the 2,581 homes in Mountainside 07092, it is worth more than 85% of them ($1,333,058 against a typical $1,014,405), its price per square foot is higher than 5% of them ($352 against a typical $438), it is bigger than 93% of them (3,792 ft² against a typical 2,340 ft²), its lot is bigger than 83% of them (0.5 ac against a typical 0.36 ac) and it is newer than 79% of them (1965 against a typical 1956). Measured against all of Union County, it is worth more than 93% 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 399 Park Slope, Mountainside, NJ?

The 2025 property tax bill for 399 Park Slope, Mountainside, NJ was $15,855. The county assessed it at $755,000.

More homes on Park Slope

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More homes in Mountainside 07092

Assigned schools

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