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CondominiumResidential
$646,387$876 / 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 98How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $533,000 on Oct 2, 2017

21 GATES ST

SOUTH BOSTON, MA 02127
Building report
2
Beds
1
Baths
738 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.
738 ft²
Lot SizeThe size of the land the home sits on, from county records.
1900
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$646K
$631K low$662K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$533,000 · Oct 2, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,124 (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.$528,800 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$528,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$723,900

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.1999
Lot (acres)The size of the land the home sits on, from county records.0.02
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(7)

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
Michael J. Perkins Elementary SchoolD-
Elementary · Grades KG–5 · 0.2 mi
H
Excel High SchoolD-
High · Grades 9–12 · 0.2 mi
M
James Condon K-8 SchoolF
Middle · Grades PK–8 · 0.4 mi

District: Boston School District

Neighborhood · ZIP 02127These 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.110
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.79

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.44%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.10%
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.37,644
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.15,131 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$146,200
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$170,961
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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 Gates 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 77% of homes in South Boston 02127
  • Costs more per square foot than 71% of homes in South Boston 02127
  • Smaller than 86% of homes in Suffolk County
  • Has a smaller lot than 88% of homes in Suffolk County
  • Older than 69% of homes in Suffolk County

What homes are worth in South Boston 02127

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

This home
$440K$1.9M

This home is worth more than 23% of homes in South Boston 02127.

How it measures up in South Boston 02127

The dot is this home. The mark in the middle is the typical home in South Boston 02127.

Estimated value$646,387
CheaperTypical $844,141Pricier

Pricier than 23% of homes nearby

Price per ft²$876
CheaperTypical $807Pricier

Pricier than 71% of homes nearby

Living area738 ft²
SmallerTypical 1,201 ft²Bigger

Bigger than 15% of homes nearby

Lot size738 ft²
SmallerTypical 1,220 ft²Bigger

Bigger than 13% of homes nearby

Year built1900
OlderTypical 1905Newer

Newer than 44% of homes nearby

How 21 Gates St ranks against every home in each area.
MeasureThis homeSouth Boston 02127Suffolk County
Estimated valuepricier than$646,38723% of homes40% of homes
Price per ft²pricier than$87671% of homes71% of homes
Living areabigger than738 ft²15% of homes14% of homes
Lot sizebigger than738 ft²13% of homes12% of homes
Year builtnewer than190044% of homes31% of homes

About 21 Gates St

How much is 21 Gates St, South Boston, MA worth?

The TopHap Estimate for 21 Gates St, South Boston, MA is $646,387 as of Sep 24, 2026. The likely range is $630,800 to $661,974. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Gates St, South Boston, MA last sell?

21 Gates St, South Boston, MA last sold on Oct 2, 2017 for $533,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 21 Gates St, South Boston, MA?

21 Gates St, South Boston, MA has 2 bedrooms, 1 bathrooms, 738 square feet of living space and a 0.02-acre lot.

When was 21 Gates St, South Boston, MA built?

21 Gates St, South Boston, MA was built in 1900, making it 126 years old. The building has 1 story.

What schools serve 21 Gates St, South Boston, MA?

21 Gates St, South Boston, MA is assigned to Michael J. Perkins Elementary School (elementary), rated D-; Excel High School (high), rated D-; James Condon K-8 School (middle), rated F. All sit in Boston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Gates St, South Boston, MA compare to other homes in South Boston 02127?

Among the 11,103 homes in South Boston 02127, it is worth more than 23% of them ($646,387 against a typical $844,141), its price per square foot is higher than 71% of them ($876 against a typical $807), it is bigger than 15% of them (738 ft² against a typical 1,201 ft²), its lot is bigger than 13% of them (738 ft² against a typical 1,220 ft²) and it is newer than 44% of them (1900 against a typical 1905). Measured against all of Suffolk County, it is worth more than 40% 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 21 Gates St, South Boston, MA?

The 2025 property tax bill for 21 Gates St, South Boston, MA was $6,124. The county assessed it at $528,800.

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