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

$4,288,300

Trulia Estimate
  • 3 Beds
  • 3.5 Baths
  • 4,347 sqft

523 E Putnam Ave #PENTHOUSE, Cos Cob, CT 06807

Cos Cob
Est. Refi. Payment $28,251/mo*
Refinance Your Home
Currently Off Market - Sold Nov 3, 2016 for $2,800,000

Home Value

Trulia Estimate
$4.29M
Since last month
Decreased$147K (-3.3%)
Since last year
Increased$243K (+6%)
Since last sale
Increased$1M (+53.2%)
Learn more about this home's value by checking out its Trulia Estimate, the value of nearby homes, and how much similar homes have sold for.

Trulia Estimate

The of this home's value increased by +7% in the last 10 years
MonthEstimated value
2026
August 2026$4.29M
August 2026$4.25M
July 2026$4.43M
June 2026$4.32M
May 2026$4.15M
April 2026$4.28M
March 2026$4.4M
February 2026$4.27M
January 2026$4.21M
2025
2024

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
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
24 Decatur St #2, Cos Cob, CT
0.32
Condo
$850,000
07/06/26
2
2.5
1,643
98 Valley Rd #12, Cos Cob, CT
0.29
Condo
$960,000
06/15/26
3
1.5
1,240
6 Caroline Farms Road #4, Greenwich, CT
0.56
Condo
$1,190,000
07/17/26
2
3.5
2,042

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
523 East Putnam Avenue #PH, Greenwich, CT 06830
0.01
$5,646,100
3
3.5
4,898
Off Market
523 E Putnam Ave #B, Cos Cob, CT 06807
0.00
$2,744,000
3
3.5
3,251
Off Market
523 East Putnam Avenue #B, Greenwich, CT 06830
0.01
$2,745,700
3
3.5
3,251
Off Market
6 Nassau Pl #4, Greenwich, CT 06807
0.07
$936,900
3
1.5
1,554
Off Market
519 E Putnam Avenue, Cos Cob, CT 06807
0.06
$2,040,400
5
3
2,992
Off Market
47 Valley Rd #B3, Cos Cob, CT 06807
0.09
$465,500
2
0.5
800
Recently Sold
89 River Rd #305, Cos Cob, CT 06807
0.08
$1,684,300
2
2
1,230
Off Market
89 River Rd #201, Cos Cob, CT 06807
0.08
$1,746,100
2
2
1,240
Off Market
89 River Rd #303, Cos Cob, CT 06807
0.08
$1,536,200
2
2
1,184
Off Market
115 River Rd #7, Greenwich, CT 06807
0.11
$1,625,000
3
2.5
2,185
Recently Sold
115 River Rd #12, Greenwich, CT 06807
0.11
$1,729,200
3
2.5
1,926
Off Market

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

Home Highlights

Condo
Built in 2011
4,347 sqft
$986/sqft
Garage

About this House

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). This property is not currently displayed as for sale or rent on Trulia. The Trulia Estimate is $4,288,300.
Last check for updates: about 16 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

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

Price and Tax history

DateEventPrice
Nov 3, 2016
Source: Greenwich MLS, Inc. #96973
Sold
$2,800,000

Market trends in Greenwich

Last updated July 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$2.44M
$338KMoM
Sale-to-List Price
103.8%
1.1%MoM
Price per sq ft
$825
$24MoM
Available listings
182
8MoM

Around this home

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

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.

Frequently asked questions about 523 E Putnam Ave #PENTHOUSE

  • What is 523 E Putnam Ave #PENTHOUSE estimated to be worth?
    Trulia's estimated value for 523 E Putnam Ave #PENTHOUSE in Cos Cob, CT is $4,288,300.
  • What is the price history for 523 E Putnam Ave #PENTHOUSE?
    523 E Putnam Ave #PENTHOUSE in Cos Cob, CT last sold for $2,800,000 in November 2016.
  • Is Cos Cob a buyer's or seller's market?
    Cos Cob is currently a seller's market, based on recent for-sale activity.
  • What's the median sale price in Cos Cob?
    The median sale price in Cos Cob is $2.44M. That is up $338K from the prior month.
  • Does 523 E Putnam Ave #PENTHOUSE have air conditioning?
    Yes, 523 E Putnam Ave #PENTHOUSE in Cos Cob, CT has air conditioning.
  • Does 523 E Putnam Ave #PENTHOUSE have laundry facilities?
    Yes, 523 E Putnam Ave #PENTHOUSE in Cos Cob, CT has laundry facilities.

Explore by feature - Pet Friendly

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Apartments for Rent

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Off Market Homes Near 523 E Putnam Ave #PENTHOUSE

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