523 E Putnam Ave #PENTHOUSE, Cos Cob, CT 06807
Property image
Property image
OFF MARKET

523 E Putnam Ave #PENTHOUSE
Cos Cob, CT 06807

Cos Cob
  • 3 Beds
  • 3.5 Baths
  • 4,347 sqft

$4,314,500

Trulia Estimate
as of Jul 17, 2026
Est. Refi. Payment $27,831/mo*
Refinance Your Home

$4,314,500

Trulia Estimate
as of Jul 17, 2026
Est. Refi. Payment $27,831/mo*
Refinance Your Home
3 Beds
3.5 Baths
4,347 sqft

Local Information

  • Map ViewExplore the area around 523 E Putnam Ave #PENTHOUSE.
  • Schools1 Preschool School1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Description

Captain's view: modern one floor living in high end complex. Luxurious penthouse with views of the harbor. Award winning architect and developer have created elegant living spaces with soaring ceilings,great attention to detail and high end amenities. Three bedrooms including grand master suite with his & her baths and giant walk in closet,private balcony, gourmet eat-in kitchen, library, family room off kitchen, elevator from heated garage, mudroom and pantry, private garden with sunken terrace and large outdoor deck. Three car garage. Large assigned storage facility for outdoor furniture, bikes, kayaks, suitcases etc. in lower level. Sophisticated living at its best. Protected and set high up overlooking the harbor.
523 E Putnam Ave #PENTHOUSE, Cos Cob, CT 06807 is a 3 bedroom, 4 bathroom, 4,347 sqft condo in Cos Cob, built in 2011. It last sold for $2,800,000 on Nov 3, 2016 (7% below the $2,995,000 asking price). It is currently off market. The Trulia Estimate is $4,314,500.

Home Highlights

Parking
Garage
Outdoor
Deck
A/C
Heating & Cooling
HOA
None
Price/Sqft
No Info
Listed
180+ days ago

Home Details for 523 E Putnam Ave #PENTHOUSE

Interior Features

Interior Details
Basement: Partial
Beds & Baths
Number of Bedrooms: 3Number of Bathrooms: 4Number of Bathrooms (full): 3Number of Bathrooms (half): 1
Dimensions and Layout
Living Area: 4347 Square Feet
Appliances & Utilities
Laundry: Laundry Room
Heating & Cooling
Heating: Natural Gas,Forced AirHas CoolingAir Conditioning: Central AirHas HeatingHeating Fuel: Natural Gas
Fireplace & Spa
Number of Fireplaces: 1Spa: BathHas a FireplaceHas a Spa
Levels, Entrance, & Accessibility
Elevator
Security
Security: Security System

Exterior Features

Exterior Home Features
Roof: OtherPatio / Porch: Terrace, DeckNo Private Pool
Parking & Garage
Number of Garage Spaces: 3Number of Covered Spaces: 3Has a GarageParking Spaces: 3Parking: Assigned

Property Information

Year Built
Year Built: 2011
Property Type / Style
Property Type: ResidentialProperty Subtype: Residential, Condominium
Building
Construction Materials: Clapboard
Property Information
Included in Sale: Washer/Dryer, All Kitchen ApplncsParcel Number: 082614/S

Price & Status

Price
List Price: $2,995,000
Status Change & Dates
Off Market Date: Tue Nov 01 2016

Active Status

MLS Status: Closed

Location

Direction & Address
City: Cos Cob
School Information
Elementary School: Cos CobJr High / Middle School: Central

Building

Building Area
Building Area: 4347 Square Feet

HOA

HOA Fee Includes: Snow Removal, Maintenance GroundsHOA Name (second): Harbor HouseHas an HOA

Mobile R/V

Mobile Home Park
Mobile Home Units: Feet

Miscellaneous

BasementMls Number: 96973
Last check for updates: about 9 hours ago
Listed by Barbara Wells, (203) 912-5644
Houlihan Lawrence
Bought with: Allen Vetrosky, (203) 981-8793, BHHS New England Properties
Source: Greenwich MLS, Inc., MLS#96973

Price History for 523 E Putnam Ave #PENTHOUSE

DatePriceEventSource
11/03/2016$2,800,000Sold
Greenwich MLS, Inc. #96973

Market trends in Greenwich

Last updated June 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$2.1M
$340KMoM
Sale-to-List Price
102.7%
1.5%MoM
Price per sq ft
$801
$22MoM
Available listings
190
7MoM
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Comparable Sales for 523 E Putnam Ave #PENTHOUSE

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
523 E Putnam Ave #B, Cos Cob, CT
0.00
Condo
$2,550,000
09/09/25
3
3.5
3,251
523 East Putnam Avenue #B, Greenwich, CT
0.01
Condo
$2,550,000
09/09/25
3
3.5
3,251
115 River Rd #7, Greenwich, CT
0.11
Condo
$1,625,000
05/06/26
3
2.5
2,185
24 Harold St #E, Cos Cob, CT
0.22
Condo
$1,660,000
03/09/26
4
3.5
2,736
44 Valley Rd #A, Cos Cob, CT
0.22
Condo
$1,580,000
11/21/25
4
3.5
2,632
453 E Putnam Ave #4B, Cos Cob, CT
0.09
Condo
$850,000
05/20/26
2
2.5
1,464
453 East Putnam Avenue #4B, Greenwich, CT
0.11
Condo
$850,000
05/20/26
2
2.5
1,464
89 River Rd #303, Cos Cob, CT
0.08
Condo
$1,425,000
07/17/25
2
2
1,184
453 E Putnam Ave #1I, Cos Cob, CT
0.11
Condo
$795,000
08/07/25
2
2.5
1,464
24 Decatur St #2, Cos Cob, CT
0.32
Condo
$850,000
07/06/26
2
2.5
1,643

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Assigned Schools

These are the assigned schools for 523 E Putnam Ave #PENTHOUSE.
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The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

Neighborhood Overview

Cos Cob
See Local Highlights
Neighborhood stats provided by third party data sources.

What Locals Say about Cos Cob

At least 1 Trulia users voted on each feature.

  • 100 % Say neighbors are friendly

  • 100 % Say there are community events

  • 100 % Say there's holiday spirit

  • 100 % Say it's walkable to grocery stores

  • 100 % Say it's walkable to restaurants

  • 100 % Say parking is easy

  • 100 % Say car is needed

  • 100 % Say streets are well-lit

  • 100 % Say it's dog friendly

Sourced by Trulia users. Learn more about our methodology.

LGBTQ Local Legal Protections

Apartments for Rent

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Explore by feature - Pet Friendly

41 pet-friendly rentals in Cos Cob, CT

Explore by feature - Garage

62 rentals with a garage in Cos Cob, CT

Explore by feature - Air Conditioning

131 rentals with air conditioning in Cos Cob, CT

Explore by feature - Pool

21 rentals with a pool in Cos Cob, CT

Explore by feature - Washer/dryer

110 rentals with a washer/dryer in Cos Cob, CT

Explore by feature - Outdoor Space

25 rentals with an outdoor space in Cos Cob, CT

Homes for sale near 523 E Putnam Ave #PENTHOUSE

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Off Market Homes Near 523 E Putnam Ave #PENTHOUSE

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Listing data courtesy of Greenwich MLS. IDX information is provided exclusively for consumers’ personal, non-commercial use, that it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed accurate by the MLS.