Introducing a timeless Round Hill estate, on the market for the first time in over 50 years. Nestled midway along a quiet cul-de-sac, this pastoral property spans over 10+ sweeping, private acres with mature plantings and specimen tress overlooking a tranquil pond. The main residence features beautifully proportioned, sun-filled rooms, 5 bedrooms, 4 full and 2 half baths, and a walk-out lower level that opens to a terrace and pool. Additional highlights include a greenhouse, a 6-stall barn with lounge, tack room, staff apartment, and expansive paddocks with easy access to Greenwich riding trails. An exceptional offering in the heart of Round Hill providing an opportunity to renovate or build your own dream home —experience the privacy and legacy of this remarkable estate.
Sold for $6,200,000 on 12/12/25
$6,200,000
21 Aiken Rd, Greenwich, CT 06831
5beds
6,714sqft
Residential, Single Family Residence
Built in 1957
10.37 Acres Lot
$6,202,800 Zestimate®
$923/sqft
$23,891 Estimated rent
Home value
$6,202,800
$5.64M - $6.82M
$23,891/mo
Zestimate® history
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What's special
Zillow last checked: 8 hours ago
Listing updated: December 12, 2025 at 02:01pm
Listed by:
Krissy Blake 203-536-2743,
Sotheby's International Realty
Bought with:
Krissy Blake, RES.0765419
Sotheby's International Realty
Source: Greenwich MLS, Inc.,MLS#: 122813
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 5
- Bathrooms: 6
- Full bathrooms: 4
- 1/2 bathrooms: 2
Heating
- Hot Water
Cooling
- Wall Unit(s)
Appliances
- Laundry: Laundry Room
Features
- Eat-in Kitchen, Sep Shower
- Basement: Finished
- Number of fireplaces: 3
Interior area
- Total structure area: 6,714
- Total interior livable area: 6,714 sqft
Property
Parking
- Total spaces: 3
- Parking features: Garage Door Opener
- Garage spaces: 3
Features
- Patio & porch: Terrace
- Has private pool: Yes
Lot
- Size: 10.37 Acres
- Features: Meadow, Parklike
Details
- Additional structures: Stable(s), Staff Quarters
- Parcel number: 102375
- Zoning: RA-4
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Ranch
- Property subtype: Residential, Single Family Residence
Materials
- Brick
- Roof: Asphalt
Condition
- Year built: 1957
Utilities & green energy
- Sewer: Septic Tank
- Water: Well
- Utilities for property: Propane
Community & neighborhood
Location
- Region: Greenwich
Price history
| Date | Event | Price |
|---|---|---|
| 12/12/2025 | Sold | $6,200,000-14.5%$923/sqft |
Source:  Greenwich MLS, Inc. #122813 | ||
| 9/2/2025 | Pending sale | $7,250,000$1,080/sqft |
Source: Greenwich MLS, Inc. #122813 | ||
| 8/22/2025 | Contingent | $7,250,000$1,080/sqft |
Source: Greenwich MLS, Inc. #122813 | ||
| 5/17/2025 | Listed for sale | $7,250,000$1,080/sqft |
Source: Greenwich MLS, Inc. #122813 | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $28,970 +2.8% | $2,406,180 |
| 2024 | $28,176 +2.8% | $2,406,180 |
| 2023 | $27,406 +1% | $2,406,180 |
Find assessor info on the county website
Neighborhood: 06831
Nearby schools
GreatSchools rating
- 9/10Parkway SchoolGrades: K-5Distance: 0.6 mi
- 7/10Western Middle SchoolGrades: 6-8Distance: 7.4 mi
- 10/10Greenwich High SchoolGrades: 9-12Distance: 6.1 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.
Sell for more on Zillow
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$6,202,800
2% more+ $124K
With Zillow Showcase(estimated)
$6,326,856