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CondominiumResidential
$579,564$534 / 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 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jun 23, 2026
Last sold for $455,000 on Jan 24, 2020

42 ROSEMONT ST

DORCHESTER, MA 02122
Building report
2
Beds
1
Baths
1,085 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.
1,085 ft²
Lot SizeThe size of the land the home sits on, from county records.
1905
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$580K
$533K low$626K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$455,000 · Jan 24, 2020
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$168,564
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$134,851
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.71%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$411,000
HARBORONE MORTGAGE · R · recorded Oct 14, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,788 (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.$499,800 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$499,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$568,575

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
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.2009
Lot (acres)The size of the land the home sits on, from county records.0.03
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(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
Richard J. Murphy K-8 SchoolB-
Elementary · Grades PK–8 · 0.3 mi
H
Community Academy Of Science And HealthD-
High · Grades 9–12 · 0.6 mi

District: Boston School District

Neighborhood · ZIP 02122These 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.90
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 100.76

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.22%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.16%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.23,849
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.11,977 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$84,827
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$116,947
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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

42 Rosemont 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.

  • Worth less than 71% of homes in Suffolk County
  • Costs more per square foot than 67% of homes in Dorchester
  • Smaller than 84% of homes in Dorchester
  • Has a smaller lot than 89% of homes in Dorchester

What homes are worth in Dorchester 02122

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

This home
$321K$1.2M

This home is worth more than 38% of homes in Dorchester 02122.

How it measures up in Dorchester 02122

The dot is this home. The mark in the middle is the typical home in Dorchester 02122.

Estimated value$579,564
CheaperTypical $636,948Pricier

Pricier than 38% of homes nearby

Price per ft²$534
CheaperTypical $506Pricier

Pricier than 64% of homes nearby

Living area1,085 ft²
SmallerTypical 1,907 ft²Bigger

Bigger than 20% of homes nearby

Lot size1,085 ft²
SmallerTypical 3,398 ft²Bigger

Bigger than 16% of homes nearby

Year built1905
OlderTypical 1910Newer

Newer than 46% of homes nearby

How 42 Rosemont St ranks against every home in each area.
MeasureThis homeDorchesterDorchester 02122Suffolk County
Estimated valuepricier than$579,56437% of homes38% of homes29% of homes
Price per ft²pricier than$53467% of homes64% of homes36% of homes
Living areabigger than1,085 ft²16% of homes20% of homes32% of homes
Lot sizebigger than1,085 ft²11% of homes16% of homes27% of homes
Year builtnewer than190549% of homes46% of homes37% of homes

About 42 Rosemont St

How much is 42 Rosemont St, Dorchester, MA worth?

The TopHap Estimate for 42 Rosemont St, Dorchester, MA is $579,564 as of Jun 23, 2026. The likely range is $533,198 to $625,929. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 42 Rosemont St, Dorchester, MA last sell?

42 Rosemont St, Dorchester, MA last sold on Jan 24, 2020 for $455,000, according to the county's recorded deed.

How big is 42 Rosemont St, Dorchester, MA?

42 Rosemont St, Dorchester, MA has 2 bedrooms, 1 bathrooms, 1,085 square feet of living space and a 0.03-acre lot.

When was 42 Rosemont St, Dorchester, MA built?

42 Rosemont St, Dorchester, MA was built in 1905, making it 121 years old. The building has 1 story.

What schools serve 42 Rosemont St, Dorchester, MA?

42 Rosemont St, Dorchester, MA is assigned to Richard J. Murphy K-8 School (elementary), rated B-; Community Academy Of Science And Health (high), rated D-. All sit in Boston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 42 Rosemont St, Dorchester, MA compare to other homes in Dorchester 02122?

Among the 4,918 homes in Dorchester 02122, it is worth more than 38% of them ($579,564 against a typical $636,948), its price per square foot is higher than 64% of them ($534 against a typical $506), it is bigger than 20% of them (1,085 ft² against a typical 1,907 ft²), its lot is bigger than 16% of them (1,085 ft² against a typical 3,398 ft²) and it is newer than 46% of them (1905 against a typical 1910). Measured against all of Suffolk County, it is worth more than 29% 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 42 Rosemont St, Dorchester, MA?

The 2025 property tax bill for 42 Rosemont St, Dorchester, MA was $5,788. The county assessed it at $499,800.

More homes on Rosemont St

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More homes in Dorchester 02122

Assigned schools

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