523 E Putnam Ave #A, Cos Cob, CT 06807
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OFF MARKET

523 E Putnam Ave #A
Cos Cob, CT 06807

Cos Cob
  • 2 Beds
  • 2 Baths
  • 2,566 sqft

$2,245,900

Trulia Estimate
as of Jul 4, 2026
Est. Refi. Payment $14,512/mo*
Refinance Your Home

$2,245,900

Trulia Estimate
as of Jul 4, 2026
Est. Refi. Payment $14,512/mo*
Refinance Your Home
2 Beds
2 Baths
2,566 sqft

Local Information

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

Description

Year-around water views from this luxurious one-floor condo in prestigious Harbor House, a 3-unit condo association with 2 indoor heated parking spaces and one guest parking spot. A commercial size elevator takes you to your floor. This fabulous two-bedroom ground floor apartment, features 10ft plus ceilings, custom millwork and cabinets and a spacious open floor plan with fireplaces in the living room and covered porch. Built to the highest specifications, this condo exudes a luxurious life style with hardwood quarter-sawn oak floors, gourmet kitchen, lavish baths and a spacious living room dining room combination. French doors lead to a choice of two covered porches and a beautifully landscaped private outside terrace. A spacious storage unit in the garage completes this home.
523 E Putnam Ave #A, Cos Cob, CT 06807 is a 2 bedroom, 2 bathroom, 2,566 sqft condo in Cos Cob, built in 2009. It last sold for $1,750,000 on Sep 21, 2021. More recently, it was listed as a rental in July 2019 with an asking price of $8,000 per month. That rental listing was removed on July 17, 2019. It is currently off market. The Trulia Estimate is $2,245,900, with a rent estimate of $5,994/month.

Home Highlights

Parking
No Info
Outdoor
No Info
A/C
Heating & Cooling
HOA
None
Price/Sqft
No Info
Listed
Less than a day ago

Home Details for 523 E Putnam Ave #A

Interior Features

Heating & Cooling
Heating: GasAir ConditioningCooling System: CentralHeating Fuel: Gas

Property Information

Year Built
Year Built: 2009
Property Type / Style
Property Type: Condo

Exterior Features

Parking & Garage
Parking Spaces: 2

Price History for 523 E Putnam Ave #A

DatePriceEventSource
09/21/2021$1,750,000Sold
Greenwich MLS, Inc. #113582
06/14/2021$1,750,000Listed For SaleGreenwich MLS, Inc. #113582
07/17/2019$8,000ListingRemovedAgent Provided
07/11/2019$8,000Listed For RentAgent Provided
03/16/2011$2,195,000ListingRemovedAgent Provided
01/08/2011$2,195,000PriceChange
Agent Provided
12/04/2010$2,295,000Listed For SaleAgent Provided

Market trends in Greenwich

Last updated May 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$1.76M
$257KMoM
Sale-to-List Price
101.2%
1.0%MoM
Price per sq ft
$779
$4MoM
Available listings
183
8MoM
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Comparable Sales for 523 E Putnam Ave #A

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
24 Harold St #E, Cos Cob, CT
0.17
Condo
$1,660,000
03/09/26
4
3.5
2,736
89 River Rd #303, Cos Cob, CT
0.14
Condo
$1,425,000
07/17/25
2
2
1,184
115 River Rd #7, Greenwich, CT
0.17
Condo
$1,625,000
05/06/26
3
2.5
2,185
453 E Putnam Ave #4B, Cos Cob, CT
0.05
Condo
$850,000
05/20/26
2
2.5
1,464
453 East Putnam Avenue #4B, Greenwich, CT
0.07
Condo
$850,000
05/20/26
2
2.5
1,464
523 East Putnam Avenue #B, Greenwich, CT
0.07
Condo
$2,550,000
09/09/25
3
3.5
3,251
523 E Putnam Ave #B, Cos Cob, CT
0.07
Condo
$2,550,000
09/09/25
3
3.5
3,251
453 E Putnam Ave #1I, Cos Cob, CT
0.06
Condo
$795,000
08/07/25
2
2.5
1,464
44 Valley Rd #A, Cos Cob, CT
0.15
Condo
$1,580,000
11/21/25
4
3.5
2,632
43 Harold St #B, Cos Cob, CT
0.21
Condo
$1,100,000
07/16/25
3
3.5
1,958

Nearby homes

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Assigned Schools

These are the assigned schools for 523 E Putnam Ave #A.
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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

40 pet-friendly rentals in Cos Cob, CT

Explore by feature - Garage

70 rentals with a garage in Cos Cob, CT

Explore by feature - Air Conditioning

138 rentals with air conditioning in Cos Cob, CT

Explore by feature - Pool

23 rentals with a pool in Cos Cob, CT

Explore by feature - Washer/dryer

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

Explore by feature - Outdoor Space

27 rentals with an outdoor space in Cos Cob, CT

Homes for sale near 523 E Putnam Ave #A

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Off Market Homes Near 523 E Putnam Ave #A

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