Nestled on 4.09 acres in Greenwich, CT, this breathtaking 8-bedroom Georgian Colonial estate offers unparalleled elegance and privacy. Commanding spectacular big sky views from its perch 560' above sea level, the property features exquisite formal gardens, and pool. Inside, grand-scale rooms with soaring ceilings, masterful stonework, elegant millwork, and arches create a luxurious atmosphere. Highlights include a Beverly Ellsley gourmet kitchen, cherry library, solarium, and expansive living areas. The primary suite boasts two dressing rooms, spa baths, and a sitting room. A true modern-day ''Great Estate,'' just an hour from NYC.
For sale
$12,900,000
550 Round Hill Rd, Greenwich, CT 06831
8beds
13,268sqft
:
Get pre-qualified$78,320/mo
Residential, Single Family Residence
Built in 1998
4.09 Acres Lot
$12,460,700 Zestimate®
$972/sqft
$-- HOA
What's special
Spectacular big sky viewsMasterful stoneworkExquisite formal gardensCherry libraryElegant millworkBeverly ellsley gourmet kitchenSpa baths
- 129 days |
- 2,153 |
- 154 |
Zillow last checked:
Listing updated:
Listed by:
Stephen Archino 203-964-7445,
Sotheby's International Realty
Source: Greenwich MLS, Inc.,MLS#: 124589
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 8
- Bathrooms: 13
- Full bathrooms: 9
- 1/2 bathrooms: 4
Heating
- Hydro-Air, Oil
Cooling
- Central Air
Appliances
- Laundry: Laundry Room
Features
- Back Stairs
- Windows: Double Pane Windows
- Basement: Finished
- Number of fireplaces: 8
Interior area
- Total structure area: 13,268
- Total interior livable area: 13,268 sqft
Property
Parking
- Total spaces: 6
- Parking features: Electric Gate
- Garage spaces: 6
Features
- Patio & porch: Terrace
- Exterior features: Balcony
- Has private pool: Yes
Lot
- Size: 4.09 Acres
- Features: Level, Parklike
Details
- Parcel number: 102009
- Zoning: RA-4
Construction
Type & style
- Home type: SingleFamily
- Property subtype: Residential, Single Family Residence
Materials
- Stone
- Roof: Slate
Condition
- Year built: 1998
Utilities & green energy
- Sewer: Septic Tank
- Water: Well
- Utilities for property: Propane
Community & HOA
Community
- Security: Security System
Location
- Region: Greenwich
Financial & listing details
- Price per square foot: $972/sqft
- Tax assessed value: $7,451,430
- Annual tax amount: $75,445
- Date on market: 3/30/2026
- Inclusions: Washer/Dryer, All Kitchen Applncs
Estimated market value
$12,460,700
$11.84M - $13.08M
$52,674/mo
Price history
| Date | Event | Price |
|---|---|---|
| 3/30/2026 | Listed for sale | $12,900,000-18.9%$972/sqft |
Source:  Greenwich MLS, Inc. #124589 Report a problem | ||
| 12/15/2025 | Listing removed | $15,900,000$1,198/sqft |
Source: Greenwich MLS, Inc. #123676 Report a problem | ||
| 9/30/2025 | Listed for sale | $15,900,000+47.9%$1,198/sqft |
Source: Greenwich MLS, Inc. #123676 Report a problem | ||
| 5/27/2021 | Listing removed | -- |
Source: Greenwich MLS, Inc. Report a problem | ||
| 7/17/2020 | Price change | $10,750,000-16.7%$810/sqft |
Source: Coldwell Banker Residential Brokerage #109911 Report a problem | ||
| 5/29/2020 | Listed for sale | $12,900,000+66.5%$972/sqft |
Source: Coldwell Banker Residential Brokerage #109911 Report a problem | ||
| 9/14/1998 | Sold | $7,750,000$584/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $89,715 +2.8% | $7,451,430 |
| 2024 | $87,256 +2.8% | $7,451,430 |
| 2023 | $84,872 +1% | $7,451,430 |
| 2022 | $84,052 -3.2% | $7,451,430 -0.5% |
| 2021 | $86,809 | $7,490,000 |
| 2020 | $86,809 -0.8% | $7,490,000 |
| 2019 | $87,483 -8.7% | $7,490,000 -11.1% |
| 2018 | $95,830 | $8,428,350 |
| 2017 | $95,830 +13.6% | $8,428,350 +12.6% |
| 2015 | $84,368 +2.7% | $7,486,080 |
| 2014 | $82,122 | $7,486,080 |
Find assessor info on the county website
Monthly payment
Est. payment
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.Climate risks
Neighborhood: 06831
Nearby schools
GreatSchools rating
- 10/10Parkway SchoolGrades: K-5Distance: 0.8 mi
- 8/10Western Middle SchoolGrades: 6-8Distance: 7.3 mi
- 10/10Greenwich High SchoolGrades: 9-12Distance: 5.9 mi
Schools provided by the listing agent
- Elementary: Parkway
- Middle: Western
Source: Greenwich MLS, Inc.. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
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A local agent can set up tours, give advice and negotiate with sellers.
A local lender can help you make sure your offer is ready when you are.
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