$2,900,000
SOLD JUL 15, 2025
4 Beds
5.5 Baths
5,479 Sq Ft
4.22 Acres

Recently Sold

$529 Per Sq Ft

23% Below List Price

353 Days on Market

Highlights

  • Private Pool
  • 4.22 Acre Lot
  • Post Modern Architecture
  • Parkway School Rated A
  • Wooded Lot
  • 1 Fireplace

About This Home

As of July 2025

At the end of a cul-de-sac off Round Hill Road in back-country Greenwich awaits 66 Sumner, a 4+ acre property with private auto-gate, tennis court, pool and a canopy of specimen trees. This Mid-Century Modern home was constructed by global architectural firm Spector Group with interiors by John Saladino, one of the world's most distinguished and respected designers. 4-bedrooms, 6.5 baths, and 5,500+ SF of open living space featuring high ceilings and floor-to-ceiling windows throughout. The property is completely fenced and surrounded by a buffer of 3+ acres of wetlands for utmost privacy. Pool bath and changing rooms. New siding and decking. Generator. Unique opportunity to reimagine an architectural masterpiece nestled in a private oasis only 45 min. from NYC.

Last Agent to Sell the Property

Amy Balducci

Compass Connecticut, LLC License #RES.0794136 Listed on: 01/16/2025

Compass Connecticut, LLC

Last Buyer's Agent

Drew Peterson

Coldwell Banker Realty License #REB.0758835

Coldwell Banker Realty

Home Details

Home Type

  • Single Family

Est. Annual Taxes

  • $19,314

Year Built

  • Built in 1979

Lot Details

  • 4.22 Acre Lot
  • Fenced Yard
  • Wooded Lot
  • Property is zoned RA-4

Parking

  • 3 Car Attached Garage
  • Automatic Gate

Home Design

  • Post Modern Architecture
  • Composition Roof
  • Wood Siding

Interior Spaces

  • 5,479 Sq Ft Home
  • Built-In Features
  • High Ceiling
  • Skylights
  • 1 Fireplace
  • Home Office
  • Home Gym
  • Home Security System
  • Washer and Dryer
  • Finished Basement

Bedrooms and Bathrooms

  • 4 Bedrooms
  • Cedar Closet
  • Dressing Area

Pool

  • Private Pool

Utilities

  • Forced Air Heating and Cooling System
  • Heating System Uses Propane
  • Power Generator
  • Propane
  • Well
  • Electric Water Heater
  • Septic Tank

Listing and Financial Details

  • Assessor Parcel Number 10-3290

Home Details

Home Type

Single Family

Est. Annual Taxes

$19,314

Year Built

Built in 1979

Lot Details

0

Parking

3

Listing Details

  • Directions: Off of Round HIll, go to the end of Sumner cul-de-sac, then down private road, last house, gate is automatic.
  • Prop. Type: Residential
  • Year Built: 1979
  • Property Sub Type: Single Family Residence
  • Lot Size Acres: 4.22
  • Inclusions: Washer/Dryer, All Kitchen Applncs
  • Architectural Style: Post Modern
  • Garage Yn: Yes
  • Cooling System:Central AC: Yes
  • Included:WasherDryer: Yes
  • Features:Fenced Yard: Yes
  • Features:Security System2: Yes
  • Entry Hall Ceilings:Extra Height: Yes
  • Lot Description:Adjcnt Conservation: Yes
  • Features:Generator: Yes
  • Features:Auto Gate: Yes
  • Lot Description:Wooded: Yes
  • Features:Cedar Closet: Yes
  • Special Features: None

Interior Features

  • Other Equipment: Generator
  • Has Basement: Finished
  • Full Bathrooms: 5
  • Half Bathrooms: 1
  • Total Bedrooms: 4
  • Fireplaces: 1
  • Fireplace: Yes
  • Interior Amenities: Cedar Closet(s), Built-in Features
  • Basement Type:Finished2: Yes
  • Other Room LevelFP:LL49: 1
  • Living Room Comments:Built-Ins: Yes
  • Other Room Comments:Exercise Room2: Yes
  • Living Room Ceilings:Extra Height2: Yes
  • Dining Room Ceilings:Extra Height4: Yes
  • Family Room LevelFP:LL41: 1
  • Other Room Comments 2:Office Space2: Yes
  • Living Room Ceilings:Skylight2: Yes
  • Primary Bdrm Comments:Dressing Room: Yes
  • Living Room LevelFP 1st38: 1
  • Dining Room LevelFP 1st39: 1
  • Kitchen LevelFP 1st43: 1
  • Bath LevelFP 1st48: 1
  • Primary Bdrm LevelFP 1st44: 1
  • Primary Bath LevelFP 1st45: 2
  • Laundry LevelFP 1st53: 1

Exterior Features

  • Roof: Composition
  • Lot Features: Adjcnt Conservation, Wooded
  • Pool Private: Yes
  • Construction Type: Wood Siding
  • Exterior:Wood Siding: Yes
  • Roof:Composition: Yes

Garage/Parking

  • Attached Garage: No
  • Garage Spaces: 3.0
  • Parking Features: Electric Gate
  • General Property Info:Garage Desc: Attached

Utilities

  • Water Source: Well
  • Cooling: Central A/C
  • Security: Security System
  • Cooling Y N: Yes
  • Heating: Forced Air, Propane
  • Heating Yn: Yes
  • Sewer: Septic Tank
  • Utilities: Propane
  • Heat System:Forced Air: Yes
  • Hot Water:Electric3: Yes
  • Water Source:Well: Yes
  • Sanitation Source:Septic Tank: Yes
  • Heat Fuel:Propane: Yes
  • Gas Source:Propane2: Yes

Schools

  • Elementary School: Parkway
  • Middle Or Junior School: Western

Lot Info

  • Zoning: RA-4
  • Lot Size Sq Ft: 183823.2
  • Parcel #: 10-3290

Tax Info

  • Tax Annual Amount: 19313.52

Range of Values:

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Home Values in the Area

Source: Public Records

Average Home Value in this Area





Source: Public Records

Property History

Date Event Price List to Sale Price per Sq Ft
07/15/2025 07/15/25 Sold $2,900,000 -14.6% $529 / Sq Ft
06/13/2025 06/13/25 Pending -- -- --
04/02/2025 04/02/25 Price Changed $3,395,000 -9.5% $620 / Sq Ft
01/16/2025 01/16/25 For Sale $3,750,000 +29.3% $684 / Sq Ft
11/05/2024 11/05/24 Off Market $2,900,000 -- --
09/06/2024 09/06/24 Price Changed $3,750,000 -6.1% $684 / Sq Ft
06/24/2024 06/24/24 For Sale $3,995,000 -- $729 / Sq Ft
Source: Greenwich Association of REALTORS®

Tax History Compared to Growth

Source: Public Records

Tax History

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
2021 $18,093 $1,670,760 $660,800 $1,009,960
Source: Public Records

Agents Affiliated with this Home

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Map

Source: Greenwich Association of REALTORS®

MLS Number: 120871

Greenwich Association of REALTORS®

APN: GREE M:10 B:3290