..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.
Lot/land
Price cut: $80K (4/18)
$1,495,000
9 Walnut St, Cos Cob, CT 06807
3beds
0.52Acres
Land
Built in 1970
0.52 Acres Lot
$-- Zestimate®
$1,009/sqft
$-- HOA
What's special
- 240 days |
- 380 |
- 13 |
Zillow last checked:
Listing updated:
Listed by:
Peter Janis 203-249-1013,
BHHS New England Properties
Source: Greenwich MLS, Inc.,MLS#: 123887
Loading...
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 3
- Bathrooms: 1
- Full bathrooms: 1
Heating
- Natural Gas, Hot Water
Cooling
- None
Interior area
- Total structure area: 1,482
- Total interior livable area: 1,482 sqft
Property
Lot
- Size: 0.52 Acres
- Features: Level
Details
- Additional structures: Guest House
- Parcel number: 082718/S
- Zoning: R-12
Utilities & green energy
- Water: Public
Community & HOA
Location
- Region: Cos Cob
Financial & listing details
- Price per square foot: $1,009/sqft
- Tax assessed value: $714,140
- Annual tax amount: $8,825
- Date on market: 10/27/2025
Estimated market value
Not available
Estimated sales range
Not available
$4,887/mo
Price history
| Date | Event | Price |
|---|---|---|
| 4/18/2026 | Price change | $1,495,000-5.1%$1,009/sqft |
Source:  Berkshire Hathaway HomeServices New England Properties #123887 Report a problem | ||
| 4/18/2026 | Price change | $1,575,000+5.4%$1,063/sqft |
Source: Berkshire Hathaway HomeServices New England Properties #24138306 Report a problem | ||
| 4/18/2026 | Price change | $1,495,000-5.1%$1,009/sqft |
Source:  Greenwich MLS, Inc. #123887 Report a problem | ||
| 10/27/2025 | Listed for sale | $1,575,000+54.4%$1,063/sqft |
Source: Greenwich MLS, Inc. #123887 Report a problem | ||
| 7/10/2025 | Sold | $1,020,000-11.3%$688/sqft |
Source:  Smart MLS #24073498 Report a problem | ||
| 3/6/2025 | Pending sale | $1,150,000$776/sqft |
Source: Smart MLS #24073498 Report a problem | ||
| 2/17/2025 | Contingent | $1,150,000$776/sqft |
Source: Berkshire Hathaway HomeServices New England Properties #122061 Report a problem | ||
| 2/17/2025 | Pending sale | $1,150,000$776/sqft |
Source: Greenwich MLS, Inc. #122061 Report a problem | ||
| 2/12/2025 | Listed for sale | $1,150,000$776/sqft |
Source: Smart MLS #24073498 Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $8,826 +3.5% | $714,140 |
| 2024 | $8,524 +2.6% | $714,140 |
| 2023 | $8,310 +0.9% | $714,140 |
| 2022 | $8,234 +6.6% | $714,140 +11.4% |
| 2021 | $7,722 +0.2% | $641,340 |
| 2020 | $7,709 -1% | $641,340 |
| 2019 | $7,786 +2.3% | $641,340 |
| 2018 | $7,613 -1.2% | $641,340 |
| 2017 | $7,708 +31.8% | $641,340 +30.8% |
| 2015 | $5,849 +2.6% | $490,490 |
| 2014 | $5,702 +2.8% | $490,490 |
| 2013 | $5,547 +2.8% | $490,490 |
| 2012 | $5,395 +3.4% | $490,490 |
| 2011 | $5,219 -13.3% | $490,490 -26.3% |
| 2010 | $6,020 +3.4% | $665,910 |
| 2009 | $5,820 +3.6% | $665,910 |
| 2008 | $5,620 +3.6% | $665,910 |
| 2007 | $5,427 +3.8% | $665,910 |
| 2006 | $5,227 -4.8% | $665,910 +46.6% |
| 2005 | $5,491 +8.7% | $454,160 |
| 2004 | $5,050 +3.4% | $454,160 |
| 2003 | $4,882 +35.2% | $454,160 +135.2% |
| 2001 | $3,610 +5.6% | $193,060 |
| 2000 | $3,417 -4.6% | $193,060 |
| 1999 | $3,581 | $193,060 |
Find assessor info on the county website
Monthly payment
Estimated monthly payment$1,822
All calculations are estimates and provided by Zillow, Inc. for informational purposes only. Actual amounts may vary.
HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
See how much you could borrow to make a competitive offer.
Climate risks
Neighborhood: Cos Cob
Nearby schools
GreatSchools rating
- 9/10North Mianus SchoolGrades: K-5Distance: 0.8 mi
- 10/10Eastern Middle SchoolGrades: 6-8Distance: 2.4 mi
- 10/10Greenwich High SchoolGrades: 9-12Distance: 2.6 mi
Schools provided by the listing agent
- Elementary: North Mianus
- Middle: Eastern Middle
Source: Greenwich MLS, Inc.. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
A local agent can set up tours, give advice and negotiate with sellers.
Nearby cities
Nearby neighborhoods
Nearby zip codes
Other Greenwich Topics
