9 Walnut St, Cos Cob, CT 06807
Property image
Property image
SOLD
AUG 3, 2026

9 Walnut St
Cos Cob, CT 06807

Cos Cob
  • 3 Beds
  • 1 Bath
  • 1,482 sqft (on 0.52 acres)

$1,375,000

Last Sold: Aug 3, 2026
8% below list $1.5M
$928/sqft
Est. Refi. Payment $9,058/mo*
Refinance Your Home

$1,375,000

Last Sold: Aug 3, 2026
8% below list $1.5M
$928/sqft
Est. Refi. Payment $9,058/mo*
Refinance Your Home
3 Beds
1 Bath
1,482 sqft
(on 0.52 acres)

Local Information

  • Map ViewExplore the area around 9 Walnut St.
  • Schools1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Property Type
Lot/Land
Year Built
1970
Lot Size
0.52 acres
Living Area
1,482 sqft
Price/Sqft
$928/sqft

About this House

..52-Acre Buildable Lot with Existing Cottage -- North Mianus

Nestled at the end of a private road in the desirable North Mianus neighborhood, this .52-acre property offers a rare combination of privacy, potential, and flexibility. Build your own custom home--ideal for builders, investors, or end-users looking to create their dream residence.

In addition to the new-construction opportunity, the property includes an existing grandfathered 1-bedroom, 1-bath cottage, perfect for rental income, a guest house, or an in-law suite while the main home is being built.

A rare offering in one of Greenwich's most sought-after areas, located within the North Mianus Elementary and Eastern Middle School districts.
9 Walnut St, Cos Cob, CT 06807 is a 3 bedroom, 1 bathroom, 1,482 sqft lot/land in Cos Cob, built in 1970. It last sold for $1,375,000 on Aug 3, 2026 (8% below the $1,495,000 asking price). It is currently off market. The Trulia Estimate rent is $4,887/month.

Home Details for 9 Walnut St

Interior Features

Beds & Baths
Number of Bedrooms: 3Number of Bathrooms: 1Number of Bathrooms (full): 1
Dimensions and Layout
Living Area: 1482 Square Feet
Heating & Cooling
Heating: Natural Gas,Hot WaterNo CoolingAir Conditioning: NoneHas HeatingHeating Fuel: Natural Gas

Exterior Features

Exterior Home Features
Other Structures: Guest House
Frontage
Road Frontage: Private Road

Property Information

Year Built
Year Built: 1970
Property Type / Style
Property Type: LandProperty Subtype: LandArchitecture: Colonial
Building
Construction Materials: Wood Siding
Property Information
Parcel Number: 082718/S

Price & Status

Price
List Price: $1,495,000Price Per Sqft: $928/sqft
Status Change & Dates
Off Market Date: Mon Jul 27 2026

Active Status

MLS Status: Closed

Location

Direction & Address
City: Cos Cob
School Information
Elementary School: North MianusJr High / Middle School: Eastern Middle

Building

Building Area
Building Area: 1482 Square Feet

Lot Information

Lot Area: 0.52 acres

Mobile R/V

Mobile Home Park
Mobile Home Units: Feet

Miscellaneous

Mls Number: 123887
Last check for updates: about 2 hours ago
Listed by Peter Janis, (203) 249-1013
BHHS New England Properties
Bought with: Spencer Sodokoff, (203) 257-4870, Houlihan Lawrence
Source: Greenwich MLS, Inc., MLS#123887

Price History for 9 Walnut St

DatePriceEventSource
08/03/2026$1,375,000Sold
Greenwich MLS, Inc. #123887
07/27/2026$1,495,000ContingentBerkshire Hathaway HomeServices New England Properties #123887
07/27/2026$1,495,000PendingGreenwich MLS, Inc. #123887
04/18/2026$1,495,000PriceChange
Berkshire Hathaway HomeServices New England Properties #123887
04/18/2026$1,575,000PriceChange
Berkshire Hathaway HomeServices New England Properties #24138306
04/18/2026$1,495,000PriceChange
Greenwich MLS, Inc. #123887
10/27/2025$1,575,000Listed For SaleGreenwich MLS, Inc. #123887
07/10/2025$1,020,000Sold
Greenwich MLS, Inc. #122061
03/06/2025$1,150,000PendingSmart MLS #24073498
02/17/2025$1,150,000ContingentBerkshire Hathaway HomeServices New England Properties #122061
02/17/2025$1,150,000PendingGreenwich MLS, Inc. #122061
02/12/2025$1,150,000Listed For SaleSmart MLS #24073498

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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Property Tax and Assessment

Year2025
Tax$8,826
Assessment$714,140
Home facts updated by county records

Comparable Sales for 9 Walnut St

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
33 Parsonage Rd, Greenwich, CT
2.32
Lot/Land
$2,000,000
11/12/25
4
1.5
-
6 Oak Dr, Riverside, CT
3.04
Lot/Land
$3,800,000
06/17/26
4
3
3,120
19 Lakeview Drive, Riverside, CT
1.41
Lot/Land
$1,800,000
07/21/26
-
-
23 Halsey Dr, Old Greenwich, CT
1.35
Lot/Land
$1,400,000
09/04/25
-
-
89 Clapboard Ridge Rd, Greenwich, CT
2.76
Lot/Land
$4,700,000
12/19/25
5
3
3,622
59 Locust St, Greenwich, CT
3.67
Lot/Land
$3,840,000
06/01/26
5
3
3,360
9 Brook Dr, Greenwich, CT
4.39
Lot/Land
$1,750,000
08/19/25
2
1.5
2,152

Nearby homes

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Assigned Schools

These are the assigned schools for 9 Walnut St.
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

44 pet-friendly rentals in Cos Cob, CT

Explore by feature - Garage

51 rentals with a garage in Cos Cob, CT

Explore by feature - Air Conditioning

124 rentals with air conditioning in Cos Cob, CT

Explore by feature - Pool

20 rentals with a pool in Cos Cob, CT

Explore by feature - Washer/dryer

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

Explore by feature - Outdoor Space

28 rentals with an outdoor space in Cos Cob, CT

Homes for sale near 9 Walnut St

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Off Market Homes Near 9 Walnut St

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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.