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Single Family ResidenceResidential
$1,689,808$805 / 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 93How 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
Last sold for $1,135,000 on Oct 21, 2021

89 PROSPECT ST

GREENWICH, CT 06830
4
Beds
2.5
Baths
2,100 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.
3,485 ft²
Lot SizeThe size of the land the home sits on, from county records.
1909
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

$1.7M
$1.6M low$1.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,135,000 · Oct 21, 2021
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.$612,308
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$489,846
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.64%
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.$1,077,500
TD BANK NA · P · recorded Oct 21, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,194 (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.$582,120 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$305,270
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$276,850
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$582,120
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$407,484

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.62
98
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
7
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.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.152 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.0.2 percent flood zone

Scores 0–100; higher = greater projected risk.

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.Conventional
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.1950
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 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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

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
Hamilton Avenue SchoolB-
Elementary · Grades PK–5 · 0.5 mi
M
Western Middle SchoolA
Middle · Grades 6–8 · 1.1 mi
H
Greenwich High SchoolA+
High · Grades 9–12 · 1.6 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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
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

89 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.

  • Worth more than 80% of homes in Western Connecticut County
  • Costs more per square foot than 90% of homes in Western Connecticut County
  • Smaller than 69% of homes in Greenwich 06830
  • Among the smallest lots in Western Connecticut County
  • Older than 94% of homes in Western Connecticut County

What homes are worth in Greenwich 06830

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

This home
$637K$8.2M

This home is worth more than 26% of homes in Greenwich 06830.

How it measures up in Greenwich 06830

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

Estimated value$1,689,808
CheaperTypical $2,941,490Pricier

Pricier than 26% of homes nearby

Price per ft²$805
CheaperTypical $884Pricier

Pricier than 36% of homes nearby

Living area2,100 ft²
SmallerTypical 2,890 ft²Bigger

Bigger than 31% of homes nearby

Lot size3,485 ft²
SmallerTypical 0.46 acBigger

Bigger than 2% of homes nearby

Year built1909
OlderTypical 1956Newer

Newer than 12% of homes nearby

How 89 Prospect St ranks against every home in each area.
MeasureThis homeGreenwich 06830Western Connecticut County
Estimated valuepricier than$1,689,80826% of homes80% of homes
Price per ft²pricier than$80536% of homes90% of homes
Living areabigger than2,100 ft²31% of homes54% of homes
Lot sizebigger than3,485 ft²2% of homesalmost no homes
Year builtnewer than190912% of homes6% of homes

About 89 Prospect St

How much is 89 Prospect St, Greenwich, CT worth?

The TopHap Estimate for 89 Prospect St, Greenwich, CT is $1,689,808 as of Jul 14, 2026. The likely range is $1,565,510 to $1,814,106. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 89 Prospect St, Greenwich, CT last sell?

89 Prospect St, Greenwich, CT last sold on Oct 21, 2021 for $1,135,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 89 Prospect St, Greenwich, CT?

89 Prospect St, Greenwich, CT has 4 bedrooms, 2.5 bathrooms, 2,100 square feet of living space and a 0.08-acre lot.

When was 89 Prospect St, Greenwich, CT built?

89 Prospect St, Greenwich, CT was built in 1909, making it 117 years old. It is a conventional home. The building has 2 stories.

What schools serve 89 Prospect St, Greenwich, CT?

89 Prospect St, Greenwich, CT is assigned to Hamilton Avenue School (elementary), rated B-; 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 89 Prospect St, Greenwich, CT compare to other homes in Greenwich 06830?

Among the 6,738 homes in Greenwich 06830, it is worth more than 26% of them ($1,689,808 against a typical $2,941,490), its price per square foot is higher than 36% of them ($805 against a typical $884), it is bigger than 31% of them (2,100 ft² against a typical 2,890 ft²), its lot is bigger than 2% of them (3,485 ft² against a typical 0.46 ac) and it is newer than 12% of them (1909 against a typical 1956). Measured against all of Western Connecticut County, it is worth more than 80% 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 89 Prospect St, Greenwich, CT?

The 2025 property tax bill for 89 Prospect St, Greenwich, CT was $7,194. The county assessed it at $582,120.

Closest homes

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Assigned schools

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