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Triplex (3 Units, Any Combination)Residential
Last sold for $1,650,000 on Mar 28, 2019

100 OLNEY ST

DORCHESTER, MA 02121
6
Beds
3
Baths
3,120 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.
2,119 ft²
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.
3
StoriesHow many floors the home has above ground.
12
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
3
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.$1,650,000 · Mar 28, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,917 (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.$770,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$227,200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$542,800

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Triplex (3 Units, Any Combination)
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.1989
Lot (acres)The size of the land the home sits on, from county records.0.05
HeatingThe type of heating system in the home.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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
Up Academy HollandC
Elementary · Grades PK–5 · 0.1 mi
M
Lilla G. Frederick Middle SchoolD+
Middle · Grades 6–8 · 0.3 mi
H
Up Academy DorchesterC+
High · Grades PK–12 · 0.4 mi

District: Boston School District

Neighborhood · ZIP 02121These 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.142
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.100
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.13%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.23%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.28,076
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.22,114 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$45,811
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$77,928
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

100 Olney 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 86% of homes in Suffolk County
  • Has a smaller lot than 87% of homes in Dorchester 02121
  • Newer than 76% of homes in Dorchester 02121

How it measures up in Dorchester 02121

The dot is this home. The mark in the middle is the typical home in Dorchester 02121.

Living area3,120 ft²
SmallerTypical 3,264 ft²Bigger

Bigger than 46% of homes nearby

Lot size2,119 ft²
SmallerTypical 4,269 ft²Bigger

Bigger than 13% of homes nearby

Year built1920
OlderTypical 1905Newer

Newer than 76% of homes nearby

How 100 Olney St ranks against every home in each area.
MeasureThis homeDorchesterDorchester 02121Suffolk County
Living areabigger than3,120 ft²67% of homes46% of homes86% of homes
Lot sizebigger than2,119 ft²24% of homes13% of homes46% of homes
Year builtnewer than192069% of homes76% of homes55% of homes

About 100 Olney St

When did 100 Olney St, Dorchester, MA last sell?

100 Olney St, Dorchester, MA last sold on Mar 28, 2019 for $1,650,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 100 Olney St, Dorchester, MA?

100 Olney St, Dorchester, MA has 6 bedrooms, 3 bathrooms, 3,120 square feet of living space and a 0.05-acre lot.

When was 100 Olney St, Dorchester, MA built?

100 Olney St, Dorchester, MA was built in 1920, making it 106 years old. The building has 3 stories.

What schools serve 100 Olney St, Dorchester, MA?

100 Olney St, Dorchester, MA is assigned to Up Academy Holland (elementary), rated C; Lilla G. Frederick Middle School (middle), rated D+; Up Academy Dorchester (high), rated C+. All sit in Boston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 100 Olney St, Dorchester, MA compare to other homes in Dorchester 02121?

Among the 2,911 homes in Dorchester 02121, it is bigger than 46% of them (3,120 ft² against a typical 3,264 ft²), its lot is bigger than 13% of them (2,119 ft² against a typical 4,269 ft²) and it is newer than 76% of them (1920 against a typical 1905). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 100 Olney St, Dorchester, MA?

The 2025 property tax bill for 100 Olney St, Dorchester, MA was $8,917. The county assessed it at $770,000.

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Assigned schools

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