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Triplex (3 Units, Any Combination)Residential

21 ALTON CT

BROOKLINE, MA 02446
9
Beds
6
Baths
5,997 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
1910
Year BuiltThe year the home was originally built, according to county records.
3
StoriesHow many floors the home has above ground.
20
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$29,387 (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.$2,977,400 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,320,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,656,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$3,010,100

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Triplex (3 Units, Any Combination)
CountyNorfolk
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1983
Lot (acres)The size of the land the home sits on, from county records.0.18
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.Roll Tar & Gravel
HeatingThe type of heating system in the home.Steam
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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
Pierce SchoolA
Elementary · Grades KG–8 · 0.2 mi
H
Brookline High SchoolA-
High · Grades 9–12 · 0.6 mi

District: Brookline School District

Neighborhood · ZIP 02446These 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.144
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.76

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.14%
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.31,401
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.23,893 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$115,895
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$169,699
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.52%

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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 Alton 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.

  • Among the largest homes in Norfolk County
  • Has a smaller lot than 78% of homes in Norfolk County
  • Older than 87% of homes in Norfolk County

How it measures up in Brookline 02446

The dot is this home. The mark in the middle is the typical home in Brookline 02446.

Living area5,997 ft²
SmallerTypical 1,246 ft²Bigger

Bigger than 97% of homes nearby

Lot size0.18 ac
SmallerTypical 0.29 acBigger

Bigger than 37% of homes nearby

Year built1910
OlderTypical 1925Newer

Newer than 29% of homes nearby

How 21 Alton Ct ranks against every home in each area.
MeasureThis homeCoolidge CornerBrookline 02446Norfolk County
Living areabigger than5,997 ft²97% of homes97% of homesalmost all homes
Lot sizebigger than0.18 ac37% of homes37% of homes22% of homes
Year builtnewer than191028% of homes29% of homes13% of homes

About 21 Alton Ct

When did 21 Alton Ct, Brookline, MA last sell?

21 Alton Ct, Brookline, MA last sold on Mar 26, 1999, according to the county's recorded deed.

How big is 21 Alton Ct, Brookline, MA?

21 Alton Ct, Brookline, MA has 9 bedrooms, 6 bathrooms, 5,997 square feet of living space and a 0.18-acre lot.

When was 21 Alton Ct, Brookline, MA built?

21 Alton Ct, Brookline, MA was built in 1910, making it 116 years old. The building has 3 stories.

What schools serve 21 Alton Ct, Brookline, MA?

21 Alton Ct, Brookline, MA is assigned to Pierce School (elementary), rated A; Brookline High School (high), rated A-. All sit in Brookline School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Alton Ct, Brookline, MA compare to other homes in Brookline 02446?

Among the 7,868 homes in Brookline 02446, it is bigger than 97% of them (5,997 ft² against a typical 1,246 ft²), its lot is bigger than 37% of them (0.18 ac against a typical 0.29 ac) and it is newer than 29% of them (1910 against a typical 1925). 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 Alton Ct, Brookline, MA?

The 2025 property tax bill for 21 Alton Ct, Brookline, MA was $29,387. The county assessed it at $2,977,400.

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