Skip to content
Skip to content
TopHapOpen in map
Duplex (2 Units, Any Combination)Residential
Last sold for $760,000 on Apr 16, 2021

21 MIDDLE ST

WALTHAM, MA 02451
4
Beds
3 / 1
Baths
1,959 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.
3,624 ft²
Lot SizeThe size of the land the home sits on, from county records.
1900
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

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$760,000 · Apr 16, 2021
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.$570,000
GUARANTEED RATE INC · P · recorded Apr 16, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,147 (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.$829,600 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$324,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$504,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$777,400

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.23 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.minimal

Scores 0–100; higher = greater projected risk.

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.Two Family
CountyMiddlesex
Lot (acres)The size of the land the home sits on, from county records.0.08
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.Forced Air
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(11)

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
Thomas R Plympton Elementary SchoolC
Elementary · Grades KG–5 · 0.4 mi
H
Waltham Sr High SchoolC
High · Grades 9–12 · 1.3 mi
M
John F. Kennedy Middle SchoolA-
Middle · Grades 6–8 · 1.4 mi

District: Waltham School District

Neighborhood · ZIP 02451These 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.84
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.76

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.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.7%
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.16,966
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,036 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,384
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,140
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%

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.No

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 Middle 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 93% of homes in Middlesex County
  • Older than 90% of homes in Waltham 02451

How it measures up in Waltham 02451

The dot is this home. The mark in the middle is the typical home in Waltham 02451.

Living area1,959 ft²
SmallerTypical 1,776 ft²Bigger

Bigger than 59% of homes nearby

Lot size3,624 ft²
SmallerTypical 0.18 acBigger

Bigger than 12% of homes nearby

Year built1900
OlderTypical 1957Newer

Newer than 10% of homes nearby

How 21 Middle St ranks against every home in each area.
MeasureThis homeBank SquareWaltham 02451Middlesex County
Living areabigger than1,959 ft²53% of homes59% of homes55% of homes
Lot sizebigger than3,624 ft²8% of homes12% of homes7% of homes
Year builtnewer than190034% of homes10% of homes16% of homes

About 21 Middle St

When did 21 Middle St, Waltham, MA last sell?

21 Middle St, Waltham, MA last sold on Apr 16, 2021 for $760,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 21 Middle St, Waltham, MA?

21 Middle St, Waltham, MA has 4 bedrooms, 3 bathrooms, 1,959 square feet of living space and a 0.08-acre lot.

When was 21 Middle St, Waltham, MA built?

21 Middle St, Waltham, MA was built in 1900, making it 126 years old. It is a two family home. The building has 2 stories.

What schools serve 21 Middle St, Waltham, MA?

21 Middle St, Waltham, MA is assigned to Thomas R Plympton Elementary School (elementary), rated C; Waltham Sr High School (high), rated C; John F. Kennedy Middle School (middle), rated A-. All sit in Waltham School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Middle St, Waltham, MA compare to other homes in Waltham 02451?

Among the 4,967 homes in Waltham 02451, it is bigger than 59% of them (1,959 ft² against a typical 1,776 ft²), its lot is bigger than 12% of them (3,624 ft² against a typical 0.18 ac) and it is newer than 10% of them (1900 against a typical 1957). 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 Middle St, Waltham, MA?

The 2025 property tax bill for 21 Middle St, Waltham, MA was $8,147. The county assessed it at $829,600.

Closest homes

More homes in Waltham 02451

Assigned schools

Explore the area

See this home in context

Open 21 Middle St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map