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Single Family ResidenceResidential
$595,504$462 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026

50 KOSMAS ST

MARLBOROUGH, MA 01752
4
Beds
1.5
Baths
1,288 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.
0.52 ac
Lot SizeThe size of the land the home sits on, from county records.
1972
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$596K
$561K low$630K high
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$418,504
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$334,803
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.32%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$127,000
IRWIN MORTGAGE CORP · recorded Jan 6, 1999
2nd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$50,000
AMERICAN EXPRESS CENTURION BK

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,278 (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.$535,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$228,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$306,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$552,710

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Raised Ranch
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.52
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
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(9)

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
Sgt. Charles J. Jaworek Elementary SchoolC+
Elementary · Grades KG–5 · 0.2 mi
H
Marlborough High SchoolC-
High · Grades 9–12 · 0.7 mi
M
1LT Charles W. Whitcomb SchoolB-
Middle · Grades 6–8 · 1.0 mi

District: Marlborough School District

Neighborhood · ZIP 01752These 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.100
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 100.65

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.26%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.1%
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.42,223
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,953 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$88,959
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$112,206
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.Yes

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

50 Kosmas 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 less than 76% of homes in Middlesex County
  • Costs more per square foot than 88% of homes in Marlborough 01752
  • Smaller than 76% of homes in Middlesex County
  • Has a bigger lot than 65% of homes in Middlesex County
  • Newer than 66% of homes in Middlesex County

What homes are worth in Marlborough 01752

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

This home
$218K$1.1M

This home is worth more than 59% of homes in Marlborough 01752.

How it measures up in Marlborough 01752

The dot is this home. The mark in the middle is the typical home in Marlborough 01752.

Estimated value$595,504
CheaperTypical $550,256Pricier

Pricier than 59% of homes nearby

Price per ft²$462
CheaperTypical $354Pricier

Pricier than 88% of homes nearby

Living area1,288 ft²
SmallerTypical 1,586 ft²Bigger

Bigger than 31% of homes nearby

Lot size0.52 ac
SmallerTypical 0.46 acBigger

Bigger than 54% of homes nearby

Year built1972
OlderTypical 1967Newer

Newer than 58% of homes nearby

How 50 Kosmas St ranks against every home in each area.
MeasureThis homeMarlborough 01752Middlesex County
Estimated valuepricier than$595,50459% of homes24% of homes
Price per ft²pricier than$46288% of homes50% of homes
Living areabigger than1,288 ft²31% of homes24% of homes
Lot sizebigger than0.52 ac54% of homes65% of homes
Year builtnewer than197258% of homes66% of homes

About 50 Kosmas St

How much is 50 Kosmas St, Marlborough, MA worth?

The TopHap Estimate for 50 Kosmas St, Marlborough, MA is $595,504 as of Jul 14, 2026. The likely range is $560,651 to $630,356. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 50 Kosmas St, Marlborough, MA last sell?

50 Kosmas St, Marlborough, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 50 Kosmas St, Marlborough, MA?

50 Kosmas St, Marlborough, MA has 4 bedrooms, 1.5 bathrooms, 1,288 square feet of living space and a 0.52-acre lot.

When was 50 Kosmas St, Marlborough, MA built?

50 Kosmas St, Marlborough, MA was built in 1972, making it 54 years old. It is a raised ranch home. The building has 1 story.

What schools serve 50 Kosmas St, Marlborough, MA?

50 Kosmas St, Marlborough, MA is assigned to Sgt. Charles J. Jaworek Elementary School (elementary), rated C+; Marlborough High School (high), rated C-; 1LT Charles W. Whitcomb School (middle), rated B-. All sit in Marlborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 50 Kosmas St, Marlborough, MA compare to other homes in Marlborough 01752?

Among the 10,751 homes in Marlborough 01752, it is worth more than 59% of them ($595,504 against a typical $550,256), its price per square foot is higher than 88% of them ($462 against a typical $354), it is bigger than 31% of them (1,288 ft² against a typical 1,586 ft²), its lot is bigger than 54% of them (0.52 ac against a typical 0.46 ac) and it is newer than 58% of them (1972 against a typical 1967). Measured against all of Middlesex County, it is worth more than 24% 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 50 Kosmas St, Marlborough, MA?

The 2025 property tax bill for 50 Kosmas St, Marlborough, MA was $5,278. The county assessed it at $535,300.

Closest homes

More homes in Marlborough 01752

Assigned schools

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