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CondominiumResidential
$975,605$434 / 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 95How 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 $435,000 on Jul 3, 2007

51 DECATUR ST

ARLINGTON, MA 02474
4
Beds
2
Baths
2,246 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.
4,039 ft²
Lot SizeThe size of the land the home sits on, from county records.
1925
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

$976K
$926K low$1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$435,000 · Jul 3, 2007

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,156 (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.$850,100 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$850,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$773,110

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.33 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.81%
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.0.2 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
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyMIDDLESEX
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

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
Thompson Elementary SchoolA-
Elementary · Grades KG–5 · 0.3 mi
H
Arlington High SchoolA+
High · Grades 9–12 · 1.4 mi
M
Ottoson Middle SchoolA
Middle · Grades 7–8 · 2.2 mi

District: Arlington School District

Neighborhood · ZIP 02474These 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.93
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.106
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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.28,960
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,757 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$135,066
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$157,393
Average tempThe average temperature here across a full year.49°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%

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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

51 Decatur 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 69% of homes in Middlesex County
  • Costs less per square foot than 93% of homes in Arlington 02474
  • Bigger than 66% of homes in Middlesex County
  • Has a smaller lot than 93% of homes in Arlington 02474
  • Older than 72% of homes in Middlesex County

What homes are worth in Arlington 02474

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

This home
$331K$2.1M

This home is worth more than 44% of homes in Arlington 02474.

How it measures up in Arlington 02474

The dot is this home. The mark in the middle is the typical home in Arlington 02474.

Estimated value$975,605
CheaperTypical $1,016,969Pricier

Pricier than 44% of homes nearby

Price per ft²$434
CheaperTypical $586Pricier

Pricier than 7% of homes nearby

Living area2,246 ft²
SmallerTypical 1,974 ft²Bigger

Bigger than 63% of homes nearby

Lot size4,039 ft²
SmallerTypical 0.14 acBigger

Bigger than 7% of homes nearby

Year built1925
OlderTypical 1935Newer

Newer than 35% of homes nearby

How 51 Decatur St ranks against every home in each area.
MeasureThis homeArlington 02474Middlesex County
Estimated valuepricier than$975,60544% of homes69% of homes
Price per ft²pricier than$4347% of homes43% of homes
Living areabigger than2,246 ft²63% of homes66% of homes
Lot sizebigger than4,039 ft²7% of homes9% of homes
Year builtnewer than192535% of homes28% of homes

About 51 Decatur St

How much is 51 Decatur St, Arlington, MA worth?

The TopHap Estimate for 51 Decatur St, Arlington, MA is $975,605 as of Aug 30, 2026. The likely range is $926,420 to $1,024,790. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 51 Decatur St, Arlington, MA last sell?

51 Decatur St, Arlington, MA last sold on Jul 3, 2007 for $435,000, according to the county's recorded deed.

How big is 51 Decatur St, Arlington, MA?

51 Decatur St, Arlington, MA has 4 bedrooms, 2 bathrooms and 2,246 square feet of living space.

When was 51 Decatur St, Arlington, MA built?

51 Decatur St, Arlington, MA was built in 1925, making it 101 years old. It is a condo/apartment home. The building has 2 stories.

What schools serve 51 Decatur St, Arlington, MA?

51 Decatur St, Arlington, MA is assigned to Thompson Elementary School (elementary), rated A-; Arlington High School (high), rated A+; Ottoson Middle School (middle), rated A. All sit in Arlington School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 51 Decatur St, Arlington, MA compare to other homes in Arlington 02474?

Among the 8,570 homes in Arlington 02474, it is worth more than 44% of them ($975,605 against a typical $1,016,969), its price per square foot is higher than 7% of them ($434 against a typical $586), it is bigger than 63% of them (2,246 ft² against a typical 1,974 ft²), its lot is bigger than 7% of them (4,039 ft² against a typical 0.14 ac) and it is newer than 35% of them (1925 against a typical 1935). Measured against all of Middlesex County, it is worth more than 69% 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 51 Decatur St, Arlington, MA?

The 2025 property tax bill for 51 Decatur St, Arlington, MA was $9,156. The county assessed it at $850,100.

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