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Triplex (3 Units, Any Combination)Residential

23 FOSTER ST

BOSTON, MA 02109
4
Beds
4 / 1
Baths
2,379 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.
483 ft²
Lot SizeThe size of the land the home sits on, from county records.
1899
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.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$17,218 (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.$1,486,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$419,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,067,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,365,600

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.49%
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.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.1997
Lot (acres)The size of the land the home sits on, from county records.0.01
ConstructionThe main material the home's frame and walls are built from.Masonry/Concrete Masonry Units (Cmus)
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(5)

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 · 0.1 mi
H
Charlestown High SchoolF
High · Grades 9–12 · 0.9 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

23 Foster 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 93% of homes in Boston 02109
  • Has a smaller lot than 97% of homes in Suffolk County
  • Older than 81% of homes in Suffolk County

How it measures up in Boston 02109

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

Living area2,379 ft²
SmallerTypical 1,030 ft²Bigger

Bigger than 93% of homes nearby

Lot size483 ft²
SmallerTypical 1,002 ft²Bigger

Bigger than 5% of homes nearby

Year built1899
OlderTypical 1900Newer

Newer than 36% of homes nearby

How 23 Foster St ranks against every home in each area.
MeasureThis homeNorth EndBoston 02109Suffolk County
Living areabigger than2,379 ft²87% of homes93% of homes75% of homes
Lot sizebigger than483 ft²11% of homes5% of homes3% of homes
Year builtnewer than189938% of homes36% of homes19% of homes

About 23 Foster St

When did 23 Foster St, Boston, MA last sell?

23 Foster St, Boston, MA last sold on Feb 1, 2005, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 23 Foster St, Boston, MA?

23 Foster St, Boston, MA has 4 bedrooms, 4 bathrooms, 2,379 square feet of living space and a 0.01-acre lot.

When was 23 Foster St, Boston, MA built?

23 Foster St, Boston, MA was built in 1899, making it 127 years old. The building has 4 stories.

What schools serve 23 Foster St, Boston, MA?

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

How does 23 Foster St, Boston, MA compare to other homes in Boston 02109?

Among the 1,333 homes in Boston 02109, it is bigger than 93% of them (2,379 ft² against a typical 1,030 ft²), its lot is bigger than 5% of them (483 ft² against a typical 1,002 ft²) and it is newer than 36% of them (1899 against a typical 1900). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 23 Foster St, Boston, MA?

The 2025 property tax bill for 23 Foster St, Boston, MA was $17,218. The county assessed it at $1,486,900.

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