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

523 E Putnam Ave #B
Cos Cob, CT 06807

Cos Cob
  • 3 Beds
  • 3.5 Baths
  • 3,251 sqft

$2,705,900

Trulia Estimate
as of Jul 19, 2026
Est. Refi. Payment $17,554/mo*
Refinance Your Home

$2,705,900

Trulia Estimate
as of Jul 19, 2026
Est. Refi. Payment $17,554/mo*
Refinance Your Home
3 Beds
3.5 Baths
3,251 sqft

Local Information

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

Description

Space and convenience await you at this incredible townhouse with views of the Mianus River and a location close to Old Greenwich, Riverside and Cos Cob. This 3 bedroom, 3.5 bath home has high ceilings throughout, generously sized rooms and picture-perfect outdoor space. With 3 dedicated underground parking spaces and an elevator to take you to your living floor, this is as easy as it gets. The unit (one of only 3 in the building) offers high end finishes: coiffured ceilings, Viking appliances and his/her primary bathrooms & closets. With 3 sets of French doors giving access to outdoor spaces, you are never far from the calming water views of the river below. Gourmet kitchen and family room, as well as dining room, mud room and den flow seamlessly on the main level, along with the luxurious primary suite. The second floor offers 2 more en suite bedrooms. Access to the unit is gained from the main vestibule or from your own front door. And the outdoor fireplace on the patio overlooking the river a great place to end the day. 523 E Putnam B is not to be missed for those looking for easy living close to everything.
523 E Putnam Ave #B, Cos Cob, CT 06807 is a 3 bedroom, 4 bathroom, 3,251 sqft condo in Cos Cob, built in 2009. It last sold for $2,550,000 on Sep 9, 2025 (9% below the $2,800,000 asking price). More recently, it was listed as a rental in July 2025 with an asking price of $14,000 per month. That rental listing was removed on September 2, 2025. It is currently off market. The Trulia Estimate is $2,705,900, with a rent estimate of $8,052/month.

Home Highlights

Parking
Garage
Outdoor
No Info
A/C
Heating & Cooling
HOA
$3,066/Monthly
Price/Sqft
No Info
Listed
180+ days ago

Home Details for 523 E Putnam Ave #B

Interior Features

Beds & Baths
Number of Bedrooms: 3Number of Bathrooms: 4Number of Bathrooms (full): 3Number of Bathrooms (half): 1
Dimensions and Layout
Living Area: 3251 Square Feet
Appliances & Utilities
Laundry: Laundry Room
Heating & Cooling
Heating: Natural Gas,See Remarks,Hydro-AirHas CoolingAir Conditioning: Central AirHas HeatingHeating Fuel: Natural Gas
Fireplace & Spa
Number of Fireplaces: 2Has a Fireplace
Windows, Doors, Floors & Walls
Window: Double Pane Windows
Levels, Entrance, & Accessibility
Elevator
View
Has a ViewView: Water

Exterior Features

Exterior Home Features
Roof: OtherExterior: BalconyNo Private Pool
Parking & Garage
Number of Garage Spaces: 3Number of Covered Spaces: 3Has a GarageParking Spaces: 3Parking: Garage Door Opener

Property Information

Year Built
Year Built: 2009
Property Type / Style
Property Type: ResidentialProperty Subtype: Residential, Condominium
Building
Construction Materials: Clapboard
Property Information
Included in Sale: Washer/Dryer, All Kitchen ApplncsParcel Number: 08A2021/S

Price & Status

Price
List Price: $2,800,000
Status Change & Dates
Off Market Date: Fri Aug 08 2025

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: 3251 Square Feet

HOA

HOA Fee Includes: Trash, Snow Removal, Maintenance GroundsHOA Name (second): Harbor HouseHas an HOAHOA Fee: $3,066/Monthly

Mobile R/V

Mobile Home Park
Mobile Home Units: Feet

Miscellaneous

BasementMls Number: 122613Water ViewWater View: Water

Additional Information

HOA Amenities: None
Last check for updates: about 14 hours ago
Listed by Allen Vetrosky, (203) 981-8793
BHHS New England Properties
Bought with: Stacey Delikat, (203) 249-4595, Houlihan Lawrence
Source: Greenwich MLS, Inc., MLS#122613

Price History for 523 E Putnam Ave #B

DatePriceEventSource
09/09/2025$2,550,000Sold
Greenwich MLS, Inc. #122613
09/02/2025$14,000ListingRemovedBerkshire Hathaway HomeServices New England Properties
08/08/2025$2,800,000ContingentBerkshire Hathaway HomeServices New England Properties #122613
08/08/2025$2,800,000PendingGreenwich MLS, Inc. #122613
07/01/2025$14,000Listed For RentBerkshire Hathaway HomeServices New England Properties
05/30/2025$2,800,000PriceChange
Greenwich MLS, Inc. #122613
04/29/2025$3,095,000Listed For SaleGreenwich MLS, Inc. #122613
05/19/2024ListingRemovedBerkshire Hathaway HomeServices New England Properties
05/13/2024$14,000Listed For RentBerkshire Hathaway HomeServices New England Properties
01/13/2011$3,325,000ListingRemovedAgent Provided
01/08/2011$3,325,000PriceChange
Agent Provided
12/04/2010$3,345,000Listed For SaleAgent Provided

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 #B

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
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
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
98 Valley Rd #12, Cos Cob, CT
0.29
Condo
$960,000
06/15/26
3
1.5
1,240

Nearby homes

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Assigned Schools

These are the assigned schools for 523 E Putnam Ave #B.
View nearby schools on GreatSchools
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

43 pet-friendly rentals in Cos Cob, CT

Explore by feature - Garage

53 rentals with a garage in Cos Cob, CT

Explore by feature - Air Conditioning

125 rentals with air conditioning in Cos Cob, CT

Explore by feature - Pool

22 rentals with a pool in Cos Cob, CT

Explore by feature - Washer/dryer

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

Explore by feature - Outdoor Space

26 rentals with an outdoor space in Cos Cob, CT

Homes for sale near 523 E Putnam Ave #B

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Off Market Homes Near 523 E Putnam Ave #B

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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.