$2,550,000
SOLD SEP 9, 2025
3 Beds
3.5 Baths
3,251 Sq Ft
$3,066/mo HOA Fee

Recently Sold

$784 Per Sq Ft

18% Below List Price

101 Days on Market

Highlights

  • Water Views
  • Property is near public transit
  • End Unit
  • North Street School Rated A+
  • 1 Fireplace
  • Mud Room

About This Home

As of September 2025

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.

Last Agent to Sell the Property

Allen Vetrosky

Berkshire Hathaway NE Prop. License #RES.0797681 Listed on: 04/29/2025

Berkshire Hathaway NE Prop.

Last Buyer's Agent

Stacey Delikat

Houlihan Lawrence License #RES.0816511

Houlihan Lawrence

Property Details

Home Type

  • Condominium

Est. Annual Taxes

  • $18,422

Year Built

  • Built in 2009

Lot Details

  • End Unit
  • Stone Wall

HOA Fees

  • $3,066 Monthly HOA Fees

Home Design

  • Frame Construction
  • Clap Board Siding

Interior Spaces

  • 3,251 Sq Ft Home
  • Sound System
  • 1 Fireplace
  • Mud Room
  • Water Views
  • Basement Fills Entire Space Under The House
  • Home Security System

Kitchen

  • Built-In Oven
  • Gas Cooktop
  • Range Hood
  • Microwave
  • Dishwasher
  • Wine Cooler

Bedrooms and Bathrooms

  • 3 Bedrooms

Laundry

  • Laundry on main level
  • Dryer
  • Washer

Parking

  • 3 Car Garage
  • Automatic Garage Door Opener

Outdoor Features

  • Balcony
  • Patio

Location

  • Property is near public transit
  • Property is near a golf course

Schools

  • Cos Cob Elementary School
  • Central Middle School
  • Greenwich High School

Utilities

  • Forced Air Zoned Heating and Cooling System
  • Heating System Uses Natural Gas

Listing and Financial Details

  • Exclusions: Light pendants above kitchen island as well as mudroom light fixture
  • Assessor Parcel Number 2679016

Community Details

Overview

  • Association fees include grounds maintenance, trash pickup, snow removal, property management, pest control, insurance
  • 3 Units

Amenities

  • Public Transportation
  • Elevator

Pet Policy

  • Pets Allowed

Property Details

Home Type

Condominium

Est. Annual Taxes

$18,422

Year Built

Built in 2009

Lot Details

0

HOA Fees

$3,066 per month

Listing Details

  • Neighborhood: Cos Cob
  • Property Type: Condo/Co-Op For Sale
  • Style: Townhouse
  • Sq Ft Est Heated Above Grade: 3251
  • Total Sq Ft: 3251
  • Year Built: 2009
  • New Construction: No/Resale
  • Nearby Amenities: Commuter Bus, Golf Course, Library, Medical Facilities, Park, Private School(s), Public Rec Facilities, Public Transportation
  • Association Amenities: Elevator
  • Property Sub Type: Condominium
  • Exclusions: Light pendants above kitchen island as well as mudroom light fixture
  • Direct Waterfront: No
  • End Unit: Yes
  • Home Warranty Offered: No
  • Radon Mitigation Air Ynu: Unknown
  • Radon Mitigation Water Ynu: No
  • Unit On Floor Number: 1
  • Directions: Route 1. Driveway between Nordic Custom Builders and Diamond Hill United Methodist Church. Sign at front of driveway labeled Harbor House.
  • Financing Used: Assumed Conventional
  • In Law Apartment: No
  • Living Area Sq Ft Per Public Record: 3251
  • Spec Assoc Asses: No
  • Street Type: Avenue
  • Special Features: None

Interior Features

  • Total Bedrooms: 3
  • Total Bathrooms: 4
  • Full Bathrooms: 3
  • Half Bathrooms: 1
  • Fireplaces: 1
  • Basement Description: Full
  • Interior Amenities: Audio System, Auto Garage Door Opener, Elevator, Security System
  • Appliances: Gas Cooktop, Wall Oven, Microwave, Range Hood, Refrigerator, Freezer, Dishwasher, Washer, Dryer, Wine Chiller
  • Additional Rooms: Mud Room
  • Laundry Room Location: Laundry on each level of townhouse
  • Laundry Room Info: Main Level, Upper Level
  • Attic: No
  • Street Number Modifier: 523

Exterior Features

  • Exterior Features: Balcony, Stone Wall, Patio
  • Exterior Siding: Clapboard
  • Waterfront Description: Walk to Water View
  • Swimming Pool: No
  • Construction Description: Frame

Garage/Parking

  • Garages Number: 3
  • Garage And Parking: Parking Garage

Utilities

  • Cooling System: Central Air, Zoned
  • Heat Type: Hot Air, Zoned
  • Heat Fuel Type: Natural Gas
  • Hot Water Description: Domestic, Tank Size Unknown
  • Water Source: Public Water Connected
  • Sewer: Public Sewer Connected
  • Sewer Assess Description: Paid with taxes

Condo/Co-op/Association

  • Association Fee Includes: Grounds Maintenance, Trash Pickup, Snow Removal, Property Management, Pest Control, Insurance
  • Levels In Unit: 2
  • HOA Fees: 3066
  • HOA Fee Frequency: Monthly
  • Property Management Type: Unit Owners Association
  • Total Number of Units In Complex: Harbor House Association

Schools

  • Elementary School: Cos Cob
  • Middle School: Central
  • High School: Greenwich

Lot Info

  • Lot Description: Water View
  • Flood Zone: No
  • Zoning: R-C7
  • Parcel #: 2679016

Rental Info

  • Pets Allowed Info: Allowed
  • Pets Allowed: Yes

Multi Family

  • Total Number Of Units: 3

Tax Info

  • Tax Year: July 2025-June 2026
  • Property Tax: 18422
  • Total Assessed Value: 1490580
  • Mil Rate Total: 12.36

MLS Schools

  • Elementary School: Cos Cob
  • Middle Jr High School: Central
  • High School: Greenwich

Range of Values:

Collateral Analytics

Collateral Analytics Collateral Analytics AVMs (Automated Valuation Model) employ a number of statistical approaches combined with neighborhood-specific comparable selection guarantees the most up-to-date and precise valuations.

Not Available

Collateral Analytics does not have data for the current month. Please view the chart for historical values.

ICE

ICE Mortgage Technology ICE Mortgage Technology’s AVM (Automated Valuation Model) is a state-of-the-art online residential property valuation tool that provides a quick and accurate estimate of the value of almost any home in the U.S.

Not Available

ICE Mortgage Technology does not have data for the current month. Please view the chart for historical values.

First American

First American First American Data & Analytics’ next-generation AVM combines unrivaled data assets with a blended ensemble of valuation models to produce highly accurate, reliable valuations you can trust.

Not Available

First American does not have data for the current month. Please view the chart for historical values.

Quantarium

Quantarium Quantarium’s valuation service, repeatedly proven the industry’s most accurate and comprehensive, is supercharged with a self-learning and auto-tuning AI engine that continually becomes smarter and more accurate as it processes daily inputs from the industry’s leading RE data lake.

Not Available

Quantarium does not have data for the current month. Please view the chart for historical values.

Average Value
Not Available
List Price
Sold Price
Create a Home Valuation Report for This Property
The Home Valuation Report is an in-depth analysis detailing your home's value as well as a comparison with similar homes in the area

Home Values in the Area

Source: Public Records

Average Home Value in this Area





Source: Public Records

Property History

Date Event Price Change Sq Ft Price
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
03/29/2023 03/29/23 Rented $13,000 -7.1% --
03/26/2023 03/26/23 Under Contract -- -- --
02/15/2023 02/15/23 For Rent $14,000 -- --
Source: SmartMLS

Tax History Compared to Growth

Source: Public Records

Agents Affiliated with this Home

  • Section Image
  • Section Image
  • Section Image
  • Section Image
See All Agents

Map

Source: SmartMLS

MLS Number: 24090034

SmartMLS