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CondominiumResidential
$2,086,531$932 / 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 90How 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 $1,900,000 on Aug 7, 2024

9A MONUMENT SQ

CHARLESTOWN, MA 02129
Building report
3
Beds
3.5
Baths
2,238 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.
2,238 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.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$2.1M
$1.9M low$2.3M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,900,000 · Aug 7, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$20,279 (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.$1,751,200 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,751,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,315,815

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.2013
Lot (acres)The size of the land the home sits on, from county records.0.05
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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
Harvard / Kent Elementary SchoolC+
Elementary · Grades PK–5 · 0.1 mi
M
Warren / Prescott K-8 SchoolA-
Middle · Grades PK–8 · 0.3 mi
H
Charlestown High SchoolF
High · Grades 9–12 · 0.3 mi

District: Boston School District

Neighborhood · ZIP 02129These 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.89
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.73

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.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.18,397
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.10,594 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$152,177
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$178,903
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

9a Monument Sq 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 94% of homes in Suffolk County
  • Costs more per square foot than 74% of homes in Suffolk County
  • Bigger than 86% of homes in Charlestown 02129
  • Has a bigger lot than 91% of homes in Charlestown 02129
  • Older than 69% of homes in Suffolk County

What homes are worth in Charlestown 02129

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

This home
$464K$2.9M

This home is worth more than 91% of homes in Charlestown 02129.

How it measures up in Charlestown 02129

The dot is this home. The mark in the middle is the typical home in Charlestown 02129.

Estimated value$2,086,531
CheaperTypical $1,035,442Pricier

Pricier than 91% of homes nearby

Price per ft²$932
CheaperTypical $942Pricier

Pricier than 48% of homes nearby

Living area2,238 ft²
SmallerTypical 1,200 ft²Bigger

Bigger than 86% of homes nearby

Lot size2,238 ft²
SmallerTypical 1,133 ft²Bigger

Bigger than 91% of homes nearby

Year built1900
OlderTypical 1899Newer

Newer than 65% of homes nearby

How 9a Monument Sq ranks against every home in each area.
MeasureThis homeCharlestown 02129Suffolk County
Estimated valuepricier than$2,086,53191% of homes94% of homes
Price per ft²pricier than$93248% of homes74% of homes
Living areabigger than2,238 ft²86% of homes72% of homes
Lot sizebigger than2,238 ft²91% of homes47% of homes
Year builtnewer than190065% of homes31% of homes

About 9a Monument Sq

How much is 9a Monument Sq, Charlestown, MA worth?

The TopHap Estimate for 9a Monument Sq, Charlestown, MA is $2,086,531 as of Sep 24, 2026. The likely range is $1,883,411 to $2,289,651. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9a Monument Sq, Charlestown, MA last sell?

9a Monument Sq, Charlestown, MA last sold on Aug 7, 2024 for $1,900,000, according to the county's recorded deed.

How big is 9a Monument Sq, Charlestown, MA?

9a Monument Sq, Charlestown, MA has 3 bedrooms, 3.5 bathrooms, 2,238 square feet of living space and a 0.05-acre lot.

When was 9a Monument Sq, Charlestown, MA built?

9a Monument Sq, Charlestown, MA was built in 1900, making it 126 years old. The building has 2 stories.

What schools serve 9a Monument Sq, Charlestown, MA?

9a Monument Sq, Charlestown, MA is assigned to Harvard / Kent Elementary School (elementary), rated C+; Warren / Prescott K-8 School (middle), 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 9a Monument Sq, Charlestown, MA compare to other homes in Charlestown 02129?

Among the 5,261 homes in Charlestown 02129, it is worth more than 91% of them ($2,086,531 against a typical $1,035,442), its price per square foot is higher than 48% of them ($932 against a typical $942), it is bigger than 86% of them (2,238 ft² against a typical 1,200 ft²), its lot is bigger than 91% of them (2,238 ft² against a typical 1,133 ft²) and it is newer than 65% of them (1900 against a typical 1899). Measured against all of Suffolk County, it is worth more than 94% 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 9a Monument Sq, Charlestown, MA?

The 2025 property tax bill for 9a Monument Sq, Charlestown, MA was $20,279. The county assessed it at $1,751,200.

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