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Duplex (2 Units, Any Combination)Residential
Last sold for $615,000 on Sep 27, 2012

21 RIDGEMONT ST

ALLSTON, MA 02134
5
Beds
4
Baths
3,036 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1920
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
11
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
8
ParkingThe number of parking spaces on the property, including the garage.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$615,000 · Sep 27, 2012

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,689 (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.$1,354,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$407,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$947,800

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Conventional
CountySUFFOLK
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.2012
Lot (acres)The size of the land the home sits on, from county records.0.17
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

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
Jackson Mann K-8 School
Elementary · Grades PK–8 · 0.2 mi
H
Boston Green AcademyD-
High · Grades 6–12 · 0.3 mi

District: Boston School District

Neighborhood · ZIP 02134These 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.115
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.73

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.43%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.21%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.23,966
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.17,004 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$75,041
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$90,297
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.58%

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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 Ridgemont St 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.

  • Bigger than 85% of homes in Suffolk County
  • Has a bigger lot than 95% of homes in Allston 02134

How it measures up in Allston 02134

The dot is this home. The mark in the middle is the typical home in Allston 02134.

Living area3,036 ft²
SmallerTypical 1,190 ft²Bigger

Bigger than 80% of homes nearby

Lot size0.17 ac
SmallerTypical 1,263 ft²Bigger

Bigger than 95% of homes nearby

Year built1920
OlderTypical 1920Newer

Newer than 62% of homes nearby

How 21 Ridgemont St ranks against every home in each area.
MeasureThis homeAllston 02134Suffolk County
Living areabigger than3,036 ft²80% of homes85% of homes
Lot sizebigger than0.17 ac95% of homes91% of homes
Year builtnewer than192062% of homes55% of homes

About 21 Ridgemont St

When did 21 Ridgemont St, Allston, MA last sell?

21 Ridgemont St, Allston, MA last sold on Sep 27, 2012 for $615,000, according to the county's recorded deed.

How big is 21 Ridgemont St, Allston, MA?

21 Ridgemont St, Allston, MA has 5 bedrooms, 4 bathrooms, 3,036 square feet of living space and a 0.17-acre lot.

When was 21 Ridgemont St, Allston, MA built?

21 Ridgemont St, Allston, MA was built in 1920, making it 106 years old. It is a conventional home. The building has 2 stories.

What schools serve 21 Ridgemont St, Allston, MA?

21 Ridgemont St, Allston, MA is assigned to Jackson Mann K-8 School (elementary); Boston Green Academy (high), rated D-. All sit in Boston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Ridgemont St, Allston, MA compare to other homes in Allston 02134?

Among the 3,516 homes in Allston 02134, it is bigger than 80% of them (3,036 ft² against a typical 1,190 ft²), its lot is bigger than 95% of them (0.17 ac against a typical 1,263 ft²) and it is newer than 62% of them (1920 against a typical 1920). 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 Ridgemont St, Allston, MA?

The 2025 property tax bill for 21 Ridgemont St, Allston, MA was $15,689. The county assessed it at $1,354,800.

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