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CondominiumResidential
$413,501$329 / 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 96How 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

121 COMMONWEALTH CT

PRINCETON, NJ 08540
Building report
0
Baths
1,258 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.
17 ft²
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$414K
$395K low$432K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,577 (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.$208,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$76,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$132,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$208,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$208,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyMERCER
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
Maurice Hawk Elementary SchoolA
Elementary · Grades KG–3 · 1.9 mi
H
West Windsor-Plainsboro High School SouthA
High · Grades 9–12 · 2.3 mi
M
Thomas R. Grover Middle SchoolA-
Middle · Grades 6–8 · 4.7 mi

District: West Windsor-Plainsboro Regional School District

Neighborhood · ZIP 08540These 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.65
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.94
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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.5%
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.53,074
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,031 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$158,898
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$213,931
Average tempThe average temperature here across a full year.52°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

121 Commonwealth Ct 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 less than 95% of homes in Princeton 08540
  • Costs less per square foot than 88% of homes in Princeton 08540
  • Smaller than 89% of homes in Princeton 08540
  • Among the smallest lots in Mercer County

What homes are worth in Princeton 08540

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

This home
$294K$3.3M

This home is worth more than 5% of homes in Princeton 08540.

How it measures up in Princeton 08540

The dot is this home. The mark in the middle is the typical home in Princeton 08540.

Estimated value$413,501
CheaperTypical $1,007,078Pricier

Pricier than 5% of homes nearby

Price per ft²$329
CheaperTypical $426Pricier

Pricier than 12% of homes nearby

Living area1,258 ft²
SmallerTypical 2,244 ft²Bigger

Bigger than 11% of homes nearby

Lot size17 ft²
SmallerTypical 0.28 acBigger

Bigger than 3% of homes nearby

How 121 Commonwealth Ct ranks against every home in each area.
MeasureThis homePrinceton 08540Mercer County
Estimated valuepricier than$413,5015% of homes47% of homes
Price per ft²pricier than$32912% of homes74% of homes
Living areabigger than1,258 ft²11% of homes26% of homes
Lot sizebigger than17 ft²3% of homesalmost no homes

About 121 Commonwealth Ct

How much is 121 Commonwealth Ct, Princeton, NJ worth?

The TopHap Estimate for 121 Commonwealth Ct, Princeton, NJ is $413,501 as of Aug 30, 2026. The likely range is $395,212 to $431,790. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 121 Commonwealth Ct, Princeton, NJ last sell?

121 Commonwealth Ct, Princeton, NJ last sold on Jan 1, 1900, according to the county's recorded deed.

What schools serve 121 Commonwealth Ct, Princeton, NJ?

121 Commonwealth Ct, Princeton, NJ is assigned to Maurice Hawk Elementary School (elementary), rated A; West Windsor-Plainsboro High School South (high), rated A; Thomas R. Grover Middle School (middle), rated A-. All sit in West Windsor-Plainsboro Regional School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 121 Commonwealth Ct, Princeton, NJ compare to other homes in Princeton 08540?

Among the 13,780 homes in Princeton 08540, it is worth more than 5% of them ($413,501 against a typical $1,007,078), its price per square foot is higher than 12% of them ($329 against a typical $426), it is bigger than 11% of them (1,258 ft² against a typical 2,244 ft²) and its lot is bigger than 3% of them (17 ft² against a typical 0.28 ac). Measured against all of Mercer County, it is worth more than 47% 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 121 Commonwealth Ct, Princeton, NJ?

The 2025 property tax bill for 121 Commonwealth Ct, Princeton, NJ was $6,577. The county assessed it at $208,000.

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Assigned schools

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