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CondominiumResidential
$662,538$538 / 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 Aug 30, 2026

20 CONCORD GREENE UNIT 6

CONCORD, MA 01742
Building report
2
Beds
2
Baths
1,231 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.
25.42 ac
Lot SizeThe size of the land the home sits on, from county records.
1977
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$663K
$618K low$707K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,948 (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.$599,400 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$599,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$581,500

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.90 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.1 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
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.1980
Lot (acres)The size of the land the home sits on, from county records.25.42
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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
Thoreau Elementary SchoolB+
Elementary · Grades KG–5 · 0.2 mi
M
Concord Middle SchoolB+
Middle · Grades 6–8 · 0.9 mi
H
Concord Carlisle High SchoolA+
High · Grades 9–12 · 2.3 mi

District: Concord School District

Neighborhood · ZIP 01742These 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.47
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.74

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.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.18,974
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.737 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$185,796
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$221,000
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

20 Concord Greene Unit 6 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 less than 94% of homes in Concord 01742
  • Costs less per square foot than 73% of homes in Concord 01742
  • Smaller than 90% of homes in Concord 01742
  • Among the largest lots in Middlesex County
  • Newer than 69% of homes in Middlesex County

What homes are worth in Concord 01742

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

This home
$542K$4.2M

This home is worth more than 6% of homes in Concord 01742.

How it measures up in Concord 01742

The dot is this home. The mark in the middle is the typical home in Concord 01742.

Estimated value$662,538
CheaperTypical $1,466,484Pricier

Pricier than 6% of homes nearby

Price per ft²$538
CheaperTypical $601Pricier

Pricier than 27% of homes nearby

Living area1,231 ft²
SmallerTypical 2,387 ft²Bigger

Bigger than 10% of homes nearby

Lot size25.42 ac
SmallerTypical 0.66 acBigger

Bigger than 96% of homes nearby

Year built1977
OlderTypical 1966Newer

Newer than 68% of homes nearby

How 20 Concord Greene Unit 6 ranks against every home in each area.
MeasureThis homeConcord 01742Middlesex County
Estimated valuepricier than$662,5386% of homes34% of homes
Price per ft²pricier than$53827% of homes66% of homes
Living areabigger than1,231 ft²10% of homes22% of homes
Lot sizebigger than25.42 ac96% of homesalmost all homes
Year builtnewer than197768% of homes69% of homes

About 20 Concord Greene Unit 6

How much is 20 Concord Greene Unit 6, Concord, MA worth?

The TopHap Estimate for 20 Concord Greene Unit 6, Concord, MA is $662,538 as of Aug 30, 2026. The likely range is $617,643 to $707,433. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Concord Greene Unit 6, Concord, MA last sell?

20 Concord Greene Unit 6, Concord, MA last sold on Oct 1, 1985, according to the county's recorded deed.

How big is 20 Concord Greene Unit 6, Concord, MA?

20 Concord Greene Unit 6, Concord, MA has 2 bedrooms, 2 bathrooms, 1,231 square feet of living space and a 25.42-acre lot.

When was 20 Concord Greene Unit 6, Concord, MA built?

20 Concord Greene Unit 6, Concord, MA was built in 1977, making it 49 years old. It is a condo/apartment home. The building has 1 story.

What schools serve 20 Concord Greene Unit 6, Concord, MA?

20 Concord Greene Unit 6, Concord, MA is assigned to Thoreau Elementary School (elementary), rated B+; Concord Middle School (middle), rated B+; Concord Carlisle High School (high), rated A+. All sit in Concord School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Concord Greene Unit 6, Concord, MA compare to other homes in Concord 01742?

Among the 5,735 homes in Concord 01742, it is worth more than 6% of them ($662,538 against a typical $1,466,484), its price per square foot is higher than 27% of them ($538 against a typical $601), it is bigger than 10% of them (1,231 ft² against a typical 2,387 ft²), its lot is bigger than 96% of them (25.42 ac against a typical 0.66 ac) and it is newer than 68% of them (1977 against a typical 1966). Measured against all of Middlesex County, it is worth more than 34% 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 20 Concord Greene Unit 6, Concord, MA?

The 2025 property tax bill for 20 Concord Greene Unit 6, Concord, MA was $7,948. The county assessed it at $599,400.

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