CondominiumResidential
30 Monument Sq
CHARLESTOWN, MA 02129
968 ft²
Lot SizeThe size of the land the home sits on, from county records.
1908
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.
Built 19054 floors44 units749–1,847 ft²
$46M
All units combinedThe sum of our current value estimates for every unit in the building — roughly what the whole building's homes are worth together.
$992K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$955
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.
-0.8%vs the Charlestown ZIP median sale $/ft² ($963)
Sales Performance
—
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
—
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
0
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
0.0%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+4.3%per yeartypical hold 5.6 yrsfrom 22 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
19992001200420062012201820232025
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
19992001200420062012201820232025
49 arms-length sales on record for this building.
Unit Mix & Floor PlansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.
Every unit: size vs estimated valueEvery unit in the building as one dot: across is its size, up is our current value estimate, and color is its bedroom count. Vertical columns of dots are recurring floor plans; the height spread within a column shows how much floor, view and condition move prices for the same layout.
1 bd2 bd3 bd
1 bed
21 units$882K · $907/ft²
2 bed
20 units$1.2M · $997/ft²
3 bed
3 units$1.6M · $1090/ft²
Recurring floor plansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.
1 bd · 1 ba · 884 ft²
2 units$796K · $901/ft²
1 bd · 1 ba · 896 ft²
2 units$806K · $900/ft²
1 bd · 1 ba · 968 ft²
2 units$922K · $953/ft²
1 bd · 1 ba · 1,053 ft²
2 units$982K · $933/ft²
1 bd · 1 ba · 1,063 ft²
2 units$895K · $842/ft²
2 bd · 1.5 ba · 1,085 ft²
2 units$1.2M · $1072/ft²
2 bd · 1.5 ba · 1,100 ft²
2 units$1.2M · $1078/ft²
2 bd · 1.5 ba · 1,254 ft²
2 units$1.2M · $955/ft²
2 bd · 1.5 ba · 1,286 ft²
2 units$1.2M · $943/ft²
One-off layouts
26 units
Value DistributionHow the building's units spread across value ranges by our current estimates. A wide spread usually means big differences in size, floor or view.
$791K–$915K
18 units
$929K–$992K
4 units
$1M–$1.2M
5 units
$1.2M–$1.3M
13 units
$1.6M–$1.6M
2 units
$1.8M–$1.8M
1 unit
Value by Floor & LineAverage estimated price per square foot by floor range, using unit numbers to infer floors. Higher floors usually price higher — the gap shows how much the view is worth here.
Floor 1
$968/ft²11 units · +1%
Floor 2
$960/ft²11 units · +1%
Floor 3
$959/ft²11 units · +0%
Floor 4
$975/ft²10 units · +2%
Unit lines by $/ft²Condo units stacked vertically share a unit line — the last digits of the unit number (like 05 in 1205, 1305, 1405). Lines share a layout and exposure, so comparing estimated $/ft² by line shows which position in the building commands a premium.
Line ·06
$1062/ft²4 units · +11%
Line ·05
$1062/ft²4 units · +11%
Line ·07
$1030/ft²4 units · +8%
Line ·04
$1024/ft²4 units · +7%
Line ·11
$969/ft²4 units · +1%
Line ·02
$966/ft²3 units · +1%
Line ·08
$941/ft²4 units · -1%
Line ·01
$917/ft²4 units · -4%
Line ·10
$906/ft²4 units · -5%
Line ·09
$885/ft²4 units · -7%
Line ·03
$856/ft²4 units · -10%
Ownership & Financing
Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.30%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.27%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.10.8 yrs
Cash purchases (5 yrs)The share of purchases in the last 5 years with no mortgage recorded. High cash share is common in second-home and investor buildings.73%
Avg. loan-to-valueAverage current loan balance against unit value across the building. Low numbers mean owners hold lots of equity — a sign of financial stability.29%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$1,157,741
Median tax billThe middle annual property tax bill among the building's units.$10,287
Pre-foreclosure noticesUnits with an active pre-foreclosure or foreclosure notice on file.0
Recent SalesThe latest recorded arms-length sales in the building, newest first.
Unit 303Jan 13, 2025$875,000$823/ft²Unit 202Nov 12, 2024$1,200,000$942/ft²Unit 402Jul 2, 2024$1,450,000$1156/ft²Unit 410Jun 27, 2024$790,000$894/ft²Unit 204May 3, 2024$1,225,000$1069/ft²Unit 209May 1, 2024$875,000$822/ft²Unit 111Mar 15, 2024$1,200,000$933/ft²Unit 107May 1, 2023$935,000$870/ft²Unit 404Oct 21, 2022$830,000$731/ft²Unit 407Aug 12, 2022$1,380,000$984/ft²
Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.
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.2021
Lot (acres)The size of the land the home sits on, from county records.0.02
HeatingThe type of heating system in the home.Heat Pump
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
Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.
EH
Warren / Prescott K-8 SchoolA-
Elementary · Grades PK–8 · 0.2 mi
Charlestown High SchoolF
High · Grades 9–12 · 0.2 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%
All UnitsEvery property record the county has at this street address, such as the units in a condo building. Prices shown are our estimates, not asking prices.
30 Monument Sq # 101
1 bd · 1 ba · 903 ft²
30 Monument Sq # 102
2 bd · 1.5 ba · 1,289 ft²
30 Monument Sq # 103
1 bd · 1 ba · 1,060 ft²
30 Monument Sq # 104
2 bd · 1.5 ba · 1,139 ft²
30 Monument Sq # 105
1 bd · 1 ba · 882 ft²
30 Monument Sq # 106
1 bd · 1 ba · 749 ft²
30 Monument Sq # 107
2 bd · 1.5 ba · 1,075 ft²
30 Monument Sq # 108
1 bd · 1 ba · 950 ft²
30 Monument Sq # 109
2 bd · 1 ba · 1,068 ft²
30 Monument Sq # 110
1 bd · 1 ba · 889 ft²
30 Monument Sq # 111
2 bd · 1.5 ba · 1,286 ft²
30 Monument Sq # 201
1 bd · 1 ba · 898 ft²
30 Monument Sq # 202
2 bd · 1 ba · 1,274 ft²
30 Monument Sq Apt 203
1 bd · 1 ba · 1,047 ft²
30 Monument Sq # 204
2 bd · 1.5 ba · 1,146 ft²
30 Monument Sq # 205
2 bd · 1.5 ba · 1,151 ft²
30 Monument Sq # 206
2 bd · 2.5 ba · 1,140 ft²
30 Monument Sq # 207
3 bd · 2 ba · 1,427 ft²
30 Monument Sq # 208
1 bd · 1 ba · 976 ft²
30 Monument Sq # 209
1 bd · 1 ba · 1,064 ft²
30 Monument Sq # 210
1 bd · 1 ba · 885 ft²
30 Monument Sq # 211
2 bd · 1.5 ba · 1,286 ft²
30 Monument Sq # 301
1 bd · 1 ba · 896 ft²
30 Monument Sq # 302
2 bd · 1.5 ba · 1,254 ft²
30 Monument Sq # 303
1 bd · 1 ba · 1,063 ft²
30 Monument Sq # 304
2 bd · 1.5 ba · 1,136 ft²
30 Monument Sq # 305
2 bd · 1.5 ba · 1,100 ft²
30 Monument Sq # 306
2 bd · 1.5 ba · 1,085 ft²
30 Monument Sq # 307
3 bd · 2 ba · 1,398 ft²
30 Monument Sq # 308
1 bd · 1 ba · 968 ft²
30 Monument Sq # 309
1 bd · 1 ba · 1,053 ft²
30 Monument Sq # 310
1 bd · 1 ba · 884 ft²
30 Monument Sq # 311
2 bd · 1.5 ba · 1,283 ft²
30 Monument Sq # 401
1 bd · 1 ba · 896 ft²
30 Monument Sq # 402
2 bd · 1.5 ba · 1,254 ft²
30 Monument Sq # 403
1 bd · 1 ba · 1,063 ft²
30 Monument Sq # 404
2 bd · 1.5 ba · 1,136 ft²
30 Monument Sq # 405
2 bd · 1.5 ba · 1,100 ft²
30 Monument Sq # 406
2 bd · 1.5 ba · 1,085 ft²
30 Monument Sq # 407
3 bd · 2 ba · 1,403 ft²
30 Monument Sq # 408
1 bd · 1 ba · 968 ft²
30 Monument Sq # 409
1 bd · 1 ba · 1,053 ft²
30 Monument Sq # 410
1 bd · 1 ba · 884 ft²
30 Monument Sq # 411
2 bd · 2 ba · 1,847 ft²
Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.
About 30 Monument Sq
How many units are in 30 Monument Sq, Charlestown, MA?
30 Monument Sq, Charlestown, MA has 44 residential units across 4 floors, built in 1905, according to county assessor records.
What is a unit at 30 Monument Sq, Charlestown, MA worth?
The median TopHap Estimate across the 44 units at 30 Monument Sq, Charlestown, MA is $992,446. That works out to $955 per square foot. Units run from 749 to 1,847 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.
Is 30 Monument Sq, Charlestown, MA expensive for Charlestown?
Units at 30 Monument Sq, Charlestown, MA carry a median of $955 per square foot, 1% below the Charlestown median of $963 per square foot.
How often do units sell at 30 Monument Sq, Charlestown, MA?
0 units at 30 Monument Sq, Charlestown, MA sold in the last 12 months, out of 49 recorded arms-length sales all time. That is a turnover rate of 0.0% of the building per year.
Have units at 30 Monument Sq, Charlestown, MA appreciated?
Across 22 repeat sales of the same unit, 30 Monument Sq, Charlestown, MA returned a median 4.3% per year. Because each pair is the same unit bought and sold, the figure is not distorted by which units traded. The median owner held for 5.6 years.
What floor plans does 30 Monument Sq, Charlestown, MA have?
The most common plan at 30 Monument Sq, Charlestown, MA is a 1-bedroom of 884 square feet, repeated 2 times, with a median estimate of $796,458. TopHap identifies 9 recurring plans in the building.
More homes on Monument Sq
- 30 Monument Sq # 210$825K1 bd · 1 ba · 885 ft² · Sold $825K · Sep 2026
- 22 Monument Sq # 1$949K1 bd · 1 ba · 920 ft² · Sold $949K · Aug 2026
- 1 Monument Sq # 4$2.8M3 bd · 2.5 ba · 2,123 ft² · Sold $2.8M · Jul 2026
- 17 Monument Sq # 2$1.9M3 bd · 1.5 ba · 1,917 ft² · Sold $1.9M · Jul 2026
- 30 Monument Sq # 104$1.3M2 bd · 1.5 ba · 1,139 ft² · Sold $1.3M · Jun 2026
- 27 Monument Sq # 4$1.8M3 bd · 2.5 ba · 1,785 ft² · Sold $2.1M · May 2026
- 23 Monument Sq # 3$1.2M2 bd · 2 ba · 1,200 ft² · Sold $1.2M · Feb 2026
- 25 Monument Sq # 1$654K1 bd · 1 ba · 666 ft² · Sold $652K · Sep 2025
- 13 Monument Sq # 2$1.1M2 bd · 2 ba · 873 ft² · Sold $1.1M · Jul 2025
- 50 Monument Sq # 5$1.1M2 bd · 1 ba · 1,088 ft² · Sold $1.1M · Jun 2025
- 9 Monument Sq4 ba · 6,520 ft² · Sold $2.5M · Jun 2025
- 31 Monument Sq$5.7M5 bd · 5.5 ba · 4,556 ft² · Sold $5.3M · May 2025
Closest homes
- 30 Monument Sq$1.2M0 ft · 2 bd · 1.5 ba · 1,286 ft² · Sold $490K · Mar 2002
- 30 Monument Sq$796K0 ft · 1 bd · 1 ba · 884 ft² · Sold Jan 2015
- 30 Monument Sq$797K0 ft · 1 bd · 1 ba · 884 ft² · Sold $790K · Jun 2024
- 30 Monument Sq$1.3M0 ft · 2 bd · 1.5 ba · 1,283 ft² · Sold $653K · Dec 2011
- 30 Monument Sq$906K0 ft · 1 bd · 1 ba · 1,060 ft² · Sold $726K · May 2019
- 30 Monument Sq$898K0 ft · 1 bd · 1 ba · 882 ft² · Sold $390K · Mar 2013
- 30 Monument Sq$1.8M0 ft · 2 bd · 2 ba · 1,847 ft² · Sold $1.7M · Jun 2022
- 30 Monument Sq$1.2M0 ft · 2 bd · 1 ba · 1,274 ft² · Sold $1.2M · Nov 2024
More homes in Charlestown 02129
- 64 Constitution Rd$2M3 bd · 2.5 ba · 1,804 ft² · Sold $1.8M · Oct 2026
- 19 Parker St$767K2 bd · 2 ba · 1,002 ft² · Sold $720K · Oct 2026
- 35 Mystic St$679K1 bd · 1.5 ba · 780 ft² · Sold $679K · Oct 2026
- 33 Winthrop St$1.1M2 bd · 2 ba · 970 ft² · Sold $1.1M · Oct 2026
- 20 Harvard St$1.2M2 bd · 2.5 ba · 1,370 ft² · Sold $875K · Oct 2026
- 12 Washington St$599K2 bd · 1 ba · 622 ft² · Sold $599K · Oct 2026
- 106 13th St$669K2 bd · 1.5 ba · 1,013 ft² · Sold $669K · Oct 2026
- 26 Mount Vernon St$1.9M2 bd · 1.5 ba · 1,735 ft² · Sold $1.6M · Sep 2026
- 106 13th St$470K1 bd · 1 ba · 701 ft² · Sold $470K · Sep 2026
- 42 8th St$776K2 bd · 2 ba · 1,013 ft² · Sold $775K · Sep 2026
- 284 Bunker Hill St$1.5M3 bd · 2 ba · 1,389 ft² · Sold $1.5M · Sep 2026
- 253 Main St$816K2 bd · 2 ba · 972 ft² · Sold $815K · Sep 2026
Assigned schools
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