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CondominiumResidential
$3,461,468$1,643 / 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 Aug 30, 2026
Last sold for $1,875,000 on Oct 28, 2011

343 COMMERCIAL ST

BOSTON, MA 02109
Building report
2
Beds
2
Baths
2,107 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.
2,107 ft²
Lot SizeThe size of the land the home sits on, from county records.
1855
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
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

$3.5M
$3.2M low$3.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,875,000 · Oct 28, 2011

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$33,980 (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.$2,934,400 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$2,934,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,458,380

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.80%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent flood zone

Scores 0–100; higher = greater projected risk.

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.1978
Lot (acres)The size of the land the home sits on, from county records.0.05
HeatingThe type of heating system in the home.Heat Pump
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(12)

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
Eliot K-8 SchoolA-
Elementary · Grades PK–8 · 0.2 mi
H
Charlestown High SchoolD+
High · Grades 9–12 · 1.2 mi

District: Boston School District

Neighborhood · ZIP 02109These 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.151
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 100.77

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.87%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.42%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.11%
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.4,605
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.16,022 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$144,286
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$157,889
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.46 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

343 Commercial 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 more than 98% of homes in North End
  • Costs more per square foot than 97% of homes in Suffolk County
  • Bigger than 89% of homes in Boston 02109
  • Has a bigger lot than 96% of homes in North End
  • Among the oldest homes in Suffolk County

What homes are worth in Boston 02109

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

This home
$506K$4M

This home is worth more than 95% of homes in Boston 02109.

How it measures up in Boston 02109

The dot is this home. The mark in the middle is the typical home in Boston 02109.

Estimated value$3,461,468
CheaperTypical $1,020,269Pricier

Pricier than 95% of homes nearby

Price per ft²$1643
CheaperTypical $1114Pricier

Pricier than 92% of homes nearby

Living area2,107 ft²
SmallerTypical 1,030 ft²Bigger

Bigger than 89% of homes nearby

Lot size2,107 ft²
SmallerTypical 1,002 ft²Bigger

Bigger than 94% of homes nearby

Year built1855
OlderTypical 1900Newer

Newer than 8% of homes nearby

How 343 Commercial St ranks against every home in each area.
MeasureThis homeNorth EndBoston 02109Suffolk County
Estimated valuepricier than$3,461,46898% of homes95% of homes98% of homes
Price per ft²pricier than$164396% of homes92% of homes97% of homes
Living areabigger than2,107 ft²84% of homes89% of homes69% of homes
Lot sizebigger than2,107 ft²96% of homes94% of homes46% of homes
Year builtnewer than18558% of homes8% of homesalmost no homes

About 343 Commercial St

How much is 343 Commercial St, Boston, MA worth?

The TopHap Estimate for 343 Commercial St, Boston, MA is $3,461,468 as of Aug 30, 2026. The likely range is $3,188,739 to $3,734,197. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 343 Commercial St, Boston, MA last sell?

343 Commercial St, Boston, MA last sold on Oct 28, 2011 for $1,875,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 343 Commercial St, Boston, MA?

343 Commercial St, Boston, MA has 2 bedrooms, 2 bathrooms, 2,107 square feet of living space and a 0.05-acre lot.

When was 343 Commercial St, Boston, MA built?

343 Commercial St, Boston, MA was built in 1855, making it 171 years old. The building has 2 stories.

What schools serve 343 Commercial St, Boston, MA?

343 Commercial St, Boston, MA is assigned to Eliot K-8 School (elementary), rated A-; Charlestown High School (high), rated D+. All sit in Boston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 343 Commercial St, Boston, MA compare to other homes in Boston 02109?

Among the 1,333 homes in Boston 02109, it is worth more than 95% of them ($3,461,468 against a typical $1,020,269), its price per square foot is higher than 92% of them ($1643 against a typical $1114), it is bigger than 89% of them (2,107 ft² against a typical 1,030 ft²), its lot is bigger than 94% of them (2,107 ft² against a typical 1,002 ft²) and it is newer than 8% of them (1855 against a typical 1900). Measured against all of Suffolk County, it is worth more than 98% 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 343 Commercial St, Boston, MA?

The 2025 property tax bill for 343 Commercial St, Boston, MA was $33,980. The county assessed it at $2,934,400.

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