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Single Family ResidenceResidential
$3,935,559$1,262 / 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 89How 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

99 PROSPECT ST

BELMONT, MA 02478
4
Beds
3 / 2
Baths
3,119 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.
0.7 ac
Lot SizeThe size of the land the home sits on, from county records.
1930
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$3.9M
$3.5M low$4.4M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$28,464 (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.$2,499,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,364,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,135,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$2,124,675

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.Colonial
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.70
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Hot Water
FireplaceWhether the home has a fireplace, and what kind.Yes
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
Winn BrookA+
Elementary · Grades KG–3 · 0.5 mi
H
Belmont High SchoolA+
High · Grades 9–12 · 0.8 mi
M
Winthrop L Chenery Upper Elementary SchoolA-
Middle · Grades 4–6 · 1.3 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

99 Prospect 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.

  • Among the most valuable homes in Belmont 02478
  • Among the highest price per square foot in Belmont 02478
  • Bigger than 88% of homes in Belmont 02478
  • Has a bigger lot than 92% of homes in Belmont 02478
  • Older than 68% of homes in Middlesex County

What homes are worth in Belmont 02478

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

This home
$600K$3.6M

This home is worth more than almost all 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.

Estimated value$3,935,559
CheaperTypical $1,534,331Pricier

Pricier than almost all homes nearby

Price per ft²$1262
CheaperTypical $747Pricier

Pricier than almost all homes nearby

Living area3,119 ft²
SmallerTypical 2,117 ft²Bigger

Bigger than 88% of homes nearby

Lot size0.7 ac
SmallerTypical 0.16 acBigger

Bigger than 92% of homes nearby

Year built1930
OlderTypical 1930Newer

Newer than 54% of homes nearby

How 99 Prospect St ranks against every home in each area.
MeasureThis homeBelmont 02478Middlesex County
Estimated valuepricier than$3,935,559almost all homesalmost all homes
Price per ft²pricier than$1262almost all homesalmost all homes
Living areabigger than3,119 ft²88% of homes87% of homes
Lot sizebigger than0.7 ac92% of homes72% of homes
Year builtnewer than193054% of homes32% of homes

About 99 Prospect St

How much is 99 Prospect St, Belmont, MA worth?

The TopHap Estimate for 99 Prospect St, Belmont, MA is $3,935,559 as of Jul 14, 2026. The likely range is $3,490,158 to $4,380,960. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 99 Prospect St, Belmont, MA last sell?

99 Prospect St, Belmont, MA last sold on Apr 7, 2017, according to the county's recorded deed.

How big is 99 Prospect St, Belmont, MA?

99 Prospect St, Belmont, MA has 4 bedrooms, 3 bathrooms, 3,119 square feet of living space and a 0.70-acre lot.

When was 99 Prospect St, Belmont, MA built?

99 Prospect St, Belmont, MA was built in 1930, making it 96 years old. It is a colonial home. The building has 2 stories.

What schools serve 99 Prospect St, Belmont, MA?

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

How does 99 Prospect St, Belmont, MA compare to other homes in Belmont 02478?

Among the 7,995 homes in Belmont 02478, it is worth more than almost all of them ($3,935,559 against a typical $1,534,331), its price per square foot is higher than almost all of them ($1262 against a typical $747), it is bigger than 88% of them (3,119 ft² against a typical 2,117 ft²), its lot is bigger than 92% of them (0.7 ac against a typical 0.16 ac) and it is newer than 54% of them (1930 against a typical 1930). Measured against all of Middlesex County, it is worth more than almost all 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 99 Prospect St, Belmont, MA?

The 2025 property tax bill for 99 Prospect St, Belmont, MA was $28,464. The county assessed it at $2,499,000.

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