Skip to content
Skip to content
TopHapOpen in map
CondominiumResidential

9 River Rd

COS COB, CT 06807
1979
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
Built 19794 floors20 units838–1,181 ft²
$13M
All units combinedThe sum of our current value estimates for every unit in the building — roughly what the whole building's homes are worth together.
$746K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$713
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.

+3.3%vs the Cos Cob ZIP median sale $/ft² ($690)

Sales Performance

$855K
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
+27.8%
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
1
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
5.0%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+2.3%per yeartypical hold 7.7 yrsfrom 22 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
19881992200020052013201820222026
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
19881992200020052013201820222026

40 arms-length sales on record for this building.

Unit Mix & Floor PlansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.

Every unit: size vs estimated valueEvery unit in the building as one dot: across is its size, up is our current value estimate, and color is its bedroom count. Vertical columns of dots are recurring floor plans; the height spread within a column shows how much floor, view and condition move prices for the same layout.
$509K$653K$797K$941K838 ft²907 ft²975 ft²1,044 ft²1,112 ft²1,181 ft²
1 bd2 bd
1 bed
10 units
2 bed
10 units
Recurring floor plansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.
1 bd · 1 ba · 1,069 ft²
5 units
2 bd · 2 ba · 1,125 ft²
5 units
1 bd · 1 ba · 1,021 ft²
4 units
2 bd · 2 ba · 1,181 ft²
4 units
One-off layouts
2 units

Value DistributionHow the building's units spread across value ranges by our current estimates. A wide spread usually means big differences in size, floor or view.

$509K–$509K
1 unit
$614K–$614K
1 unit
$630K–$632K
2 units
$675K–$698K
2 units
$734K–$762K
4 units
$788K–$822K
3 units
$855K–$868K
2 units
$915K–$941K
2 units

Ownership & Financing

Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.80%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.10%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.12.4 yrs
Cash purchases (5 yrs)The share of purchases in the last 5 years with no mortgage recorded. High cash share is common in second-home and investor buildings.40%
Avg. loan-to-valueAverage current loan balance against unit value across the building. Low numbers mean owners hold lots of equity — a sign of financial stability.40%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$718,882
Median tax billThe middle annual property tax bill among the building's units.$4,083
Pre-foreclosure noticesUnits with an active pre-foreclosure or foreclosure notice on file.0

Recent SalesThe latest recorded arms-length sales in the building, newest first.

Unit 418Jul 1, 2026$855,000Unit 418Sep 20, 2024$835,000Unit 409Sep 18, 2024$502,624Unit 403Sep 19, 2023$704,000Unit 413Nov 1, 2022$439,000Unit 420Feb 26, 2021$462,500Unit 403Nov 12, 2020$535,000Unit 405Mar 17, 2020$362,000Unit 415Nov 13, 2019$450,000Unit 406Apr 22, 2019$494,000

Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.

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.81 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.62%
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.1 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.Condominium
CountyWESTERN CONNECTICUT
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.Hot Water
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.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

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

E
Cos Cob SchoolB
Elementary · Grades KG–5 · 0.4 mi
H
Greenwich High SchoolA+
High · Grades 9–12 · 1.0 mi
M
Central Middle SchoolA-
Middle · Grades 6–8 · 1.1 mi

District: Greenwich School District

Neighborhood · ZIP 06807These 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.54
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.112
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.103

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.7,630
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,321 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$180,144
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$235,340
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.51 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

All UnitsEvery property record the county has at this street address, such as the units in a condo building. Prices shown are our estimates, not asking prices.

9 River Rd # 401
1 bd · 1 ba · 1,021 ft²
$746K
9 River Rd # 402
2 bd · 2 ba · 1,181 ft²
9 River Rd # 403
2 bd · 2 ba · 1,125 ft²
$812K
9 River Rd # 404
1 bd · 1 ba · 1,069 ft²
9 River Rd # 405
1 bd · 1 ba · 838 ft²
$614K
9 River Rd # 406
2 bd · 2 ba · 1,181 ft²
$915K
9 River Rd # 407
2 bd · 2 ba · 1,125 ft²
$788K
9 River Rd # 408
1 bd · 1 ba · 1,069 ft²
$630K
9 River Rd # 409
1 bd · 1 ba · 1,021 ft²
$509K
9 River Rd # 410
2 bd · 2 ba · 1,181 ft²
$868K
9 River Rd # 411
2 bd · 2 ba · 1,125 ft²
$822K
9 River Rd # 412
1 bd · 1 ba · 1,069 ft²
$762K
9 River Rd # 413
1 bd · 1 ba · 1,021 ft²
$632K
9 River Rd # 414
2 bd · 2 ba · 1,181 ft²
$941K
9 River Rd # 415
2 bd · 2 ba · 1,125 ft²
9 River Rd # 416
1 bd · 1 ba · 1,069 ft²
$734K
9 River Rd # 417
1 bd · 1 ba · 1,021 ft²
$698K
9 River Rd # 418
2 bd · 2.5 ba · 1,181 ft²
$855K
9 River Rd # 419
2 bd · 2 ba · 1,125 ft²
$744K
9 River Rd # 420
1 bd · 1 ba · 1,069 ft²
$675K

Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

About 9 River Rd

How many units are in 9 River Rd, Cos Cob, CT?

9 River Rd, Cos Cob, CT has 20 residential units across 4 floors, built in 1979, according to county assessor records.

What is a unit at 9 River Rd, Cos Cob, CT worth?

The median TopHap Estimate across the 20 units at 9 River Rd, Cos Cob, CT is $746,374. That works out to $713 per square foot. Units run from 838 to 1,181 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.

Is 9 River Rd, Cos Cob, CT expensive for Cos Cob?

Units at 9 River Rd, Cos Cob, CT carry a median of $713 per square foot, 3% above the Cos Cob median of $690 per square foot.

How often do units sell at 9 River Rd, Cos Cob, CT?

1 units at 9 River Rd, Cos Cob, CT sold in the last 12 months, out of 40 recorded arms-length sales all time. That is a turnover rate of 5.0% of the building per year. The median sale over that period was $855K.

Have units at 9 River Rd, Cos Cob, CT appreciated?

Across 22 repeat sales of the same unit, 9 River Rd, Cos Cob, CT returned a median 2.3% per year. Because each pair is the same unit bought and sold, the figure is not distorted by which units traded. The median owner held for 7.7 years.

What floor plans does 9 River Rd, Cos Cob, CT have?

The most common plan at 9 River Rd, Cos Cob, CT is a 1-bedroom of 1,069 square feet, repeated 5 times, with a median estimate of $704,586. TopHap identifies 4 recurring plans in the building.

Closest homes

More homes in Cos Cob 06807

Assigned schools

Explore the area

See this home in context

Open 9 River Rd 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