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Triplex (3 Units, Any Combination)Residential

21 ALEXANDER ST

GREENWICH, CT 06830
5
Beds
3
Baths
2,834 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.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1925
Year BuiltThe year the home was originally built, according to county records.
3
StoriesHow many floors the home has above ground.
12
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,752 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$644,070 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$396,410
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$247,660
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$541,450
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$379,015

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.43
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
6
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
65
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
94
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
49
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.Triplex (3 Units, Any Combination)
CountyWESTERN CONNECTICUT
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.1960
Lot (acres)The size of the land the home sits on, from county records.0.16
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.Tile
HeatingThe type of heating system in the home.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Hamilton Avenue SchoolC+
Elementary · Grades PK–5 · 0.1 mi
M
Western Middle SchoolA-
Middle · Grades 6–8 · 0.6 mi
H
Greenwich High SchoolA+
High · Grades 9–12 · 2.2 mi

District: Greenwich School District

Neighborhood · ZIP 06830These 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.110
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.119
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.104

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.90%
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.7.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.27,704
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,501 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$168,325
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$273,728
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.50 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 Alexander 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.

  • Bigger than 73% of homes in Western Connecticut County
  • Has a smaller lot than 89% of homes in Western Connecticut County
  • Older than 89% of homes in Western Connecticut County

How it measures up in Greenwich 06830

The dot is this home. The mark in the middle is the typical home in Greenwich 06830.

Living area2,834 ft²
SmallerTypical 2,994 ft²Bigger

Bigger than 47% of homes nearby

Lot size0.16 ac
SmallerTypical 0.46 acBigger

Bigger than 22% of homes nearby

Year built1925
OlderTypical 1956Newer

Newer than 25% of homes nearby

How 21 Alexander St ranks against every home in each area.
MeasureThis homeGreenwich 06830Western Connecticut County
Living areabigger than2,834 ft²47% of homes73% of homes
Lot sizebigger than0.16 ac22% of homes11% of homes
Year builtnewer than192525% of homes11% of homes

About 21 Alexander St

When did 21 Alexander St, Greenwich, CT last sell?

21 Alexander St, Greenwich, CT last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Alexander St, Greenwich, CT?

21 Alexander St, Greenwich, CT has 5 bedrooms, 3 bathrooms, 2,834 square feet of living space and a 0.16-acre lot.

When was 21 Alexander St, Greenwich, CT built?

21 Alexander St, Greenwich, CT was built in 1925, making it 101 years old. The building has 3 stories.

What schools serve 21 Alexander St, Greenwich, CT?

21 Alexander St, Greenwich, CT is assigned to Hamilton Avenue School (elementary), rated C+; Western Middle School (middle), rated A-; Greenwich High School (high), rated A+. All sit in Greenwich School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Alexander St, Greenwich, CT compare to other homes in Greenwich 06830?

Among the 6,738 homes in Greenwich 06830, it is bigger than 47% of them (2,834 ft² against a typical 2,994 ft²), its lot is bigger than 22% of them (0.16 ac against a typical 0.46 ac) and it is newer than 25% of them (1925 against a typical 1956). 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 Alexander St, Greenwich, CT?

The 2026 property tax bill for 21 Alexander St, Greenwich, CT was $6,752. The county assessed it at $644,070.

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