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Duplex (2 Units, Any Combination)Residential
Last sold for $550,000 on Nov 22, 2004

21 THAYER ST

BELMONT, MA 02478
5
Beds
2
Baths
2,122 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1954
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$550,000 · Nov 22, 2004

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,575 (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.$1,104,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$580,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$524,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,096,923

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Colonial
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.11
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(5)

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
Daniel ButlerA+
Elementary · Grades KG–3 · 0.1 mi
M
Winthrop L Chenery Upper Elementary SchoolA+
Middle · Grades 4–6 · 1.0 mi
H
Belmont High SchoolA+
High · Grades 9–12 · 1.4 mi

District: Belmont School District

Neighborhood · ZIP 02478These 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.55
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
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.27,636
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,959 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$162,650
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$213,185
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

21 Thayer 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.

  • Has a smaller lot than 89% of homes in Belmont 02478
  • Newer than 79% of homes in Belmont 02478

How it measures up in Belmont 02478

The dot is this home. The mark in the middle is the typical home in Belmont 02478.

Living area2,122 ft²
SmallerTypical 2,118 ft²Bigger

Bigger than 50% of homes nearby

Lot size0.11 ac
SmallerTypical 0.16 acBigger

Bigger than 11% of homes nearby

Year built1954
OlderTypical 1930Newer

Newer than 79% of homes nearby

How 21 Thayer St ranks against every home in each area.
MeasureThis homeBelmont 02478Middlesex County
Living areabigger than2,122 ft²50% of homes62% of homes
Lot sizebigger than0.11 ac11% of homes13% of homes
Year builtnewer than195479% of homes45% of homes

About 21 Thayer St

When did 21 Thayer St, Belmont, MA last sell?

21 Thayer St, Belmont, MA last sold on Nov 22, 2004 for $550,000, according to the county's recorded deed.

How big is 21 Thayer St, Belmont, MA?

21 Thayer St, Belmont, MA has 5 bedrooms, 2 bathrooms, 2,122 square feet of living space and a 0.11-acre lot.

When was 21 Thayer St, Belmont, MA built?

21 Thayer St, Belmont, MA was built in 1954, making it 72 years old. It is a colonial home. The building has 2 stories.

What schools serve 21 Thayer St, Belmont, MA?

21 Thayer St, Belmont, MA is assigned to Daniel Butler (elementary), rated A+; Winthrop L Chenery Upper Elementary School (middle), rated A+; Belmont High School (high), rated A+. All sit in Belmont School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Thayer St, Belmont, MA compare to other homes in Belmont 02478?

Among the 7,995 homes in Belmont 02478, it is bigger than 50% of them (2,122 ft² against a typical 2,118 ft²), its lot is bigger than 11% of them (0.11 ac against a typical 0.16 ac) and it is newer than 79% of them (1954 against a typical 1930). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 21 Thayer St, Belmont, MA?

The 2025 property tax bill for 21 Thayer St, Belmont, MA was $12,575. The county assessed it at $1,104,000.

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