Danielle Claroni
Sotheby's International Realty
(475) 275-9349
66 Total Sales
6 in Cos Cob
$90K - $2.7M Price Range
523 E Putnam Ave Unit B Cos Cob, CT 06807
Cos Cob AreaEstimated Value: $2,861,279
3
Beds
3.5
Baths
3,251
Sq Ft
$880/Sq Ft
Est. Value
Highlights
- Waterfront
- Wood Flooring
- High Ceiling
- Cos Cob School Rated A
- 2 Fireplaces
- Mud Room
About This Home
As of September 2025Space 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.
Last Agent to Sell the Property
BHHS New England Properties License #RES.0797681 Listed on: 04/29/2025
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Townhouse Details
Home Type
- Townhome
Est. Annual Taxes
- $18,422
Year Built
- Built in 2009
HOA Fees
- $3,066 Monthly HOA Fees
Parking
- 3 Car Garage
- Tuck Under Garage
- Automatic Garage Door Opener
- Garage Door Opener
Home Design
- Clapboard
Interior Spaces
- 3,251 Sq Ft Home
- Elevator
- Coffered Ceiling
- High Ceiling
- 2 Fireplaces
- Double Pane Windows
- French Doors
- Mud Room
- Formal Entry
- Formal Dining Room
- Wood Flooring
- Water Views
- Walk-Out Basement
Kitchen
- Eat-In Kitchen
- Butlers Pantry
Bedrooms and Bathrooms
- 3 Bedrooms
- Walk-In Closet
Laundry
- Laundry Room
- Washer and Dryer
Utilities
- Central Air
- Heating System Uses Gas
- Heating System Uses Natural Gas
- Hydro-Air Heating System
- Gas Available
- Gas Water Heater
Additional Features
- Balcony
- Waterfront
Listing and Financial Details
- Assessor Parcel Number 08A-2021/S
Community Details
Overview
- Association fees include trash, snow removal, grounds care
- Harbor House Association
Pet Policy
- Pets Allowed
Ownership History
We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.
Date
Name
Owned For
Owner Type
Purchase Details
Listed on
Apr 29, 2025
Closed on
Sep 9, 2025
Sold by
523Ub Llc
Bought by
Seller's Agent
Allen Vetrosky
BHHS New England Properties
Buyer's Agent
Stacey Delikat
Houlihan Lawrence
List Price
$3,095,000
Sold Price
$2,550,000
Premium/Discount to List
-$545,000
-17.61%
Views
796
Current Estimated Value
Home Financials for this Owner
Home Financials are based on the most recent Mortgage that was taken out on this home.
Estimated Appreciation
$311,279
Avg. Annual Appreciation
11.83%
Original Mortgage
$1,955,532
Interest Rate
6.72%
Mortgage Type
New Conventional
Purchase Details
Closed on
Dec 18, 2019
Sold by
Harborview Dev Partners
Bought by
523 Ub Llc
Home Financials for this Owner
Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$1,575,000
Interest Rate
3.6%
Mortgage Type
Purchase Money Mortgage
Home Values in the Area
Average Home Value in this Area
Agents Specializing in Cos Cob, CT
-
Danielle Claroni
-
Joe Scozzafava
Joe Scozzafava
Responds QuicklyWilliam Raveis Real Estate
(475) 258-8634
35 Total Sales
1 in Cos Cob
$1,650,000 Price
-
Toni Riordan
Toni Riordan
Berkshire Hathaway NE Prop.
(475) 252-9530
81 Total Sales
1 in Cos Cob
$1,020,000 Price
-
Robin Bartholomew
Robin Bartholomew
Berkshire Hathaway NE Prop.
(914) 690-6417
66 Total Sales
17 in Cos Cob
$1M - $3.9M Price Range
-
Deb Lombardo
Deb Lombardo
Coldwell Banker Realty
(475) 271-1086
36 Total Sales
1 in Cos Cob
$1,106,625 Price
-
Jackie Calhoun
Jackie Calhoun
Coldwell Banker Realty
(845) 613-4943
185 Total Sales
1 in Cos Cob
$3,600,000 Price
Purchase History
We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.
| Date | Buyer | Sale Price | Title Company |
|---|---|---|---|
| $2,550,000 | -- | ||
| 523 Ub Llc | $2,250,000 | None Available |
Source: Public Records
Mortgage History
We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.
| Date | Status | Borrower | Loan Amount |
|---|---|---|---|
| Open | $1,955,532 | ||
| Closed | -- | $1,575,000 | |
| Previous Owner | Harborview Dev Partner | $1,400,000 |
Source: Public Records
Property History
We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.
| Date | Event | Price | List to Sale | Price per Sq Ft |
|---|---|---|---|---|
| 09/09/2025 09/09/25 | Sold | $2,550,000 | -8.9% | $784 / Sq Ft |
| 08/08/2025 08/08/25 | Pending | -- | -- | -- |
| 05/30/2025 05/30/25 | Price Changed | $2,800,000 | -9.5% | $861 / Sq Ft |
| 04/29/2025 04/29/25 | For Sale | $3,095,000 | 0.0% | $952 / Sq Ft |
| 05/17/2024 05/17/24 | Rented | $14,000 | 0.0% | -- |
| 05/15/2024 05/15/24 | Under Contract | -- | -- | -- |
| 05/13/2024 05/13/24 | For Rent | $14,000 | +7.7% | -- |
| 03/27/2023 03/27/23 | Rented | $13,000 | -7.1% | -- |
| 03/24/2023 03/24/23 | Under Contract | -- | -- | -- |
| 02/15/2023 02/15/23 | For Rent | $14,000 | +16.7% | -- |
| 10/29/2020 10/29/20 | Rented | $12,000 | +9.1% | -- |
| 10/29/2020 10/29/20 | Under Contract | -- | -- | -- |
| 08/07/2020 08/07/20 | For Rent | $11,000 | -- | -- |
Source: Greenwich Association of REALTORS®
Tax History
We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.
| Year | Tax Paid | Tax Assessment Tax Assessment Total Assessment is a certain percentage of the fair market value that is determined by local assessors to be the total taxable value of land and additions on the property. | Land | Improvement |
|---|---|---|---|---|
| 2025 | $18,422 | $1,490,580 | $0 | $1,490,580 |
| 2024 | $17,792 | $1,490,580 | $0 | $1,490,580 |
| 2023 | $17,344 | $1,490,580 | $0 | $1,490,580 |
| 2022 | $17,186 | $1,490,580 | $0 | $1,490,580 |
| 2021 | $19,829 | $1,646,960 | $0 | $1,646,960 |
| 2020 | $19,796 | $1,646,960 | $0 | $1,646,960 |
| 2019 | $19,994 | $1,646,960 | $0 | $1,646,960 |
| 2018 | $20,373 | $1,646,960 | $0 | $1,646,960 |
Source: Public Records
Agents Affiliated with this Home
-
Allen Vetrosky
Seller's Agent in 2025
Allen Vetrosky
BHHS New England Properties
(203) 981-8793
10 Total Sales
-
Stacey Delikat
Buyer's Agent in 2025
Stacey Delikat
Houlihan Lawrence
(203) 249-4595
66 Total Sales
-
Pete Danielsen
Buyer's Agent in 2024
Pete Danielsen
Sotheby's International Realty
(203) 231-7784
15 Total Sales
-
Emile de Neree
Seller's Agent in 2023
Emile de Neree
Compass Connecticut, LLC
(914) 572-4526
6 Total Sales
-
TO
Buyer's Agent in 2023
Theresa Olguin
William Raveis Real Estate
-
RO
Buyer's Agent in 2023
Reece Olguin
Houlihan Lawrence
Map
Source: Greenwich Association of REALTORS®
MLS Number: 122613
APN: 08A-2021/S
Disclaimer: Certain information contained herein is derived from information provided by parties other than Homes.com. All information provided is deemed reliable, but is not guaranteed to be accurate and should be independently verified.
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.
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