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Single Family ResidenceResidential
$7,800,000$1,752 / 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 93How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026

340 MARLBOROUGH ST

BOSTON, MA 02115
6
Beds
4.5
Baths
4,452 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.
2,464 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.
4
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$7.8M
$7.2M low$8.4M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$72,520 (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.$6,262,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$2,190,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$4,071,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$6,493,155

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.36 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.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
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.2011
Lot (acres)The size of the land the home sits on, from county records.0.06
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(6)

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.

H
Snowden International School At CopleyD-
High · Grades 9–12 · 0.4 mi
M
Carter Developmental Center
Middle · Grades 6–12 · 0.7 mi
E
William Mckinley SchoolF
Elementary · Grades KG–12 · 0.8 mi

District: Boston School District

Neighborhood · ZIP 02115These 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.103
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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
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.0.8%
PopulationHow many people live in this area.32,960
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.43,192 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$59,808
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$97,096
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%

Owner Tools

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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

340 Marlborough 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.

  • Among the most valuable homes in Suffolk County
  • Costs more per square foot than 97% of homes in Suffolk County
  • Bigger than 97% of homes in Suffolk County
  • Has a bigger lot than 87% of homes in Back Bay
  • Older than 69% of homes in Suffolk County

What homes are worth in Boston 02115

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

This home
$344K$8.7M

This home is worth more than 97% of homes in Boston 02115.

How it measures up in Boston 02115

The dot is this home. The mark in the middle is the typical home in Boston 02115.

Estimated value$7,800,000
CheaperTypical $839,081Pricier

Pricier than 97% of homes nearby

Price per ft²$1752
CheaperTypical $1145Pricier

Pricier than 89% of homes nearby

Living area4,452 ft²
SmallerTypical 862 ft²Bigger

Bigger than 95% of homes nearby

Lot size2,464 ft²
SmallerTypical 871 ft²Bigger

Bigger than 87% of homes nearby

Year built1900
OlderTypical 1900Newer

Newer than 57% of homes nearby

How 340 Marlborough St ranks against every home in each area.
MeasureThis homeBack BayBoston 02115Suffolk County
Estimated valuepricier than$7,800,00096% of homes97% of homesalmost all homes
Price per ft²pricier than$175283% of homes89% of homes97% of homes
Living areabigger than4,452 ft²94% of homes95% of homes97% of homes
Lot sizebigger than2,464 ft²87% of homes87% of homes49% of homes
Year builtnewer than190064% of homes57% of homes31% of homes

About 340 Marlborough St

How much is 340 Marlborough St, Boston, MA worth?

The TopHap Estimate for 340 Marlborough St, Boston, MA is $7,800,000 as of Oct 21, 2026. The likely range is $7,225,132 to $8,374,868. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 340 Marlborough St, Boston, MA last sell?

340 Marlborough St, Boston, MA last sold on Mar 10, 2017, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 340 Marlborough St, Boston, MA?

340 Marlborough St, Boston, MA has 6 bedrooms, 4.5 bathrooms, 4,452 square feet of living space and a 0.06-acre lot.

When was 340 Marlborough St, Boston, MA built?

340 Marlborough St, Boston, MA was built in 1900, making it 126 years old. The building has 4 stories.

What schools serve 340 Marlborough St, Boston, MA?

340 Marlborough St, Boston, MA is assigned to Snowden International School At Copley (high), rated D-; Carter Developmental Center (middle); William Mckinley School (elementary), rated F. All sit in Boston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 340 Marlborough St, Boston, MA compare to other homes in Boston 02115?

Among the 3,497 homes in Boston 02115, it is worth more than 97% of them ($7,800,000 against a typical $839,081), its price per square foot is higher than 89% of them ($1752 against a typical $1145), it is bigger than 95% of them (4,452 ft² against a typical 862 ft²), its lot is bigger than 87% of them (2,464 ft² against a typical 871 ft²) and it is newer than 57% of them (1900 against a typical 1900). Measured against all of Suffolk County, it is worth more than almost all 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 340 Marlborough St, Boston, MA?

The 2025 property tax bill for 340 Marlborough St, Boston, MA was $72,520. The county assessed it at $6,262,500.

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