523 E Putnam Ave, Cos Cob, CT 06807
Living Room - Royal Regatta
Front Covered Porch
OFF MARKET

523 E Putnam Ave
Cos Cob, CT 06807

Cos Cob
  • 5 Beds
  • 9,501 sqft (on 0.83 acres)

$4,887,400

Trulia Estimate
as of Aug 23, 2026
Est. Refi. Payment $31,955/mo*
Refinance Your Home

$4,887,400

Trulia Estimate
as of Aug 23, 2026
Est. Refi. Payment $31,955/mo*
Refinance Your Home
5 Beds
9,501 sqft
(on 0.83 acres)

Home Value

Trulia Estimate
$4.89M
Since last month
Increased$173K (+3.7%)
Since last year
Increased$938K (+24.2%)
Since last sale
Increased$2M (+72%)
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 decreased by -35% in the last 10 years
MonthEstimated value
2026
August 2026$4.82M
July 2026$4.64M
June 2026$4.49M
May 2026$4.35M
April 2026$4.62M
March 2026$4.73M
February 2026$4.61M
January 2026$4.33M
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016

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
34 Orchard St, Cos Cob, CT
0.17
Multi-Family Home
$2,022,000
06/22/26
6
2
3,168
11 Bible Street, Cos Cob, CT
0.17
Multi-Family Home
$1,275,000
05/15/26
4
2
2,432
13 Field Rd, Cos Cob, CT
0.52
Multi-Family Home
$1,450,000
07/10/26
2
2
1,662
43 Cos Cob Ave, Cos Cob, CT
0.22
Multi-Family Home
$1,575,000
08/28/25
-
3,344
67 Cos Cob Ave, Cos Cob, CT
0.34
Multi-Family Home
$1,300,000
01/05/26
-
2,629
206 Milbank Ave, Greenwich, CT
1.78
Multi-Family Home
$2,650,000
08/17/26
6
4
4,086
64 Le Grande Ave, Greenwich, CT
1.56
Multi-Family Home
$1,385,000
06/05/26
6
2
2,077
72 Alvord Ln, Stamford, CT
1.71
Multi-Family Home
$1,100,000
06/18/26
6
3
3,392
38 Catoona Lane, Stamford, CT
1.65
Multi-Family Home
$725,000
09/15/25
5
3
2,732
32-36-40 Roosevelt Avenue, Stamford, CT
2.09
Multi-Family Home
$1,350,000
11/21/25
8
4
3,664

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
519 E Putnam Avenue, Cos Cob, CT 06807
0.03
$2,094,100
5
3
2,992
Off Market
6 Nassau Pl #4, Greenwich, CT 06807
0.06
$942,400
3
1.5
1,554
Off Market
523 E Putnam Ave #PENTHOUSE, Cos Cob, CT 06807
0.07
$4,413,100
3
3.5
4,347
Off Market
523 E Putnam Ave #B, Cos Cob, CT 06807
0.07
$2,702,900
3
3.5
3,251
Off Market
47 Valley Rd #B3, Cos Cob, CT 06807
0.04
$465,500
2
0.5
800
Recently Sold
523 East Putnam Avenue #B, Greenwich, CT 06830
0.07
$2,702,900
3
3.5
3,251
Off Market
523 East Putnam Avenue #PH, Greenwich, CT 06830
0.08
$5,869,800
3
3.5
4,898
Off Market
453 E Putnam Ave #4B, Cos Cob, CT 06807
0.05
$850,000
2
2.5
1,464
Recently Sold
49 Valley Rd #D1, Cos Cob, CT 06807
0.07
$487,600
2
1
800
Off Market
453 E Putnam Ave #1I, Cos Cob, CT 06807
0.06
$844,000
2
2.5
1,464
Off Market
453 East Putnam Avenue #4B, Greenwich, CT 06830
0.07
$850,000
2
2.5
1,464
Recently Sold
453 E Putnam Ave #1E, Cos Cob, CT 06807
0.07
$1,224,400
2
2.5
1,464
Off Market

Local Information

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

Home Highlights

Property Type
Multi-Family
Year Built
2011
Lot Size
0.83 acres
Living Area
9,501 sqft
Price/Sqft
$514

About this House

Water views: Fully-occupied Harbor House Condominium complex with two units available (three in total), all with views of the Harbor. Built to the highest standards by renowned local builder and award winning architect in 2009. The interior is beautifully finished and situated on landscaped property in a central location. Each unit has outdoor private space. These high-end spacious units have an 8 car underground garage with additional private storage for each unit, and additional guest parking. Cap rate is gross total, please call for full expense sheet. 2015 taxes: $35,000. Annual income TBD. Current Individual rentals: Unit A $9,500, Unit B $11,000. Located on Boston Post Road with easy access to I-95, close to downtown Greenwich and the Metro North Train Station.
523 E Putnam Ave, Cos Cob, CT 06807 is a 5 bedroom, 9,501 sqft multi-family in Cos Cob, built in 2011. It last sold for $2,800,000 on Nov 3, 2016. More recently, it was listed as a rental in March 2013 with an asking price of $10,500 per month. That rental listing was removed on May 20, 2013. It is currently off market. The Trulia Estimate is $4,887,400, with a rent estimate of $5,506/month.

Home Details for 523 E Putnam Ave

Interior Features

Heating & Cooling
Heating: GasAir ConditioningCooling System: CentralHeating Fuel: Gas
Interior Details
Number of Rooms: 7

Property Information

Year Built
Year Built: 2011
Property Type / Style
Property Type: Multi FamilyArchitecture: Colonial

Exterior Features

Exterior Home Features
Exterior: Wood

Lot Information

Lot Area: 0.83 acres

Price and Tax history

DateEventPrice
Jul 10, 2017
Source: Agent Provided
ListingRemoved
$4,950,000
Jan 3, 2017
Source: Agent Provided
PriceChange
$4,950,000
Price decreased by 36%
Dec 21, 2016
Source: Agent Provided
Listed For Sale
$7,750,000
Nov 3, 2016
Source: N/A
Sold
$2,800,000
Oct 29, 2016
Source: Agent Provided
PriceChange
$7,750,000
Price increased by 159%

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

Frequently asked questions about 523 E Putnam Ave

  • What is 523 E Putnam Ave estimated to be worth?
    Trulia's estimated value for 523 E Putnam Ave in Cos Cob, CT is $4,887,400.
  • What is the price history for 523 E Putnam Ave?
    523 E Putnam Ave 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 have air conditioning?
    Yes, 523 E Putnam Ave in Cos Cob, CT has air conditioning.

Explore by feature - Pet Friendly

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Explore by feature - Garage

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Explore by feature - Air Conditioning

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Explore by feature - Pool

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Explore by feature - Washer/dryer

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Explore by feature - Outdoor Space

22 rentals with an outdoor space in Cos Cob, CT

Apartments for Rent

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Off Market Homes Near 523 E Putnam Ave

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