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21 Calhoun Drive

Greenwich, Connecticut 06831

ACTIVE$6,150,000
Beds
5
Baths
6 | 2
SqFt
6,143
Acres
1.80
Year Built
1923
Matt Caiola

Matt Caiola

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Pool3-Car Garage6 Fireplaces

About This Home

A rare opportunity in one of Greenwich's most coveted in-town settings, 21 Calhoun Drive combines the timeless presence and character of a classic Greenwich estate with exceptional privacy, generous scale and remarkable potential. Set amid mature landscaping on approximately 1.8 acres in a one-acre zone, the property offers nearly twice the typical lot size while remaining just moments from the heart of Greenwich. Inside, gracious entertaining rooms, comfortable everyday living spaces and distinctive architectural details create a home with warmth, character and a sense of permanence rarely replicated today. A newly renovated kitchen brings a fresh, modern sensibility to the residence and serves as a beautiful centerpiece for daily living and entertaining. A private wellness retreat, complete with an indoor pool and dedicated fitness space, brings resort-style amenities into the comfort and privacy of home. Beyond the main residence, the expansive grounds offer an exceptional opportunity to further enhance the estate. Fully permitted plans provide the option to add a Cottage, along with the potential for a pickleball or tennis court an increasingly rare offering this close to town. With its substantial acreage, established landscaping, private wellness amenities and extraordinary flexibility for the future, this is a unique opportunity to enjoy a private estate setting without sacrificing the convenience of in-town Greenwich living.

Key Facts

City/Town
Greenwich
Neighborhood
N/A
Property / Style
Single Family · Tudor
Year Built
1923
Days on Market
54 days
Beds
5
Baths
6 full · 2 half
Living Area
6,143 sq ft
Lot Size
1.80 acres
Garage / Parking
3 garage
Property Taxes
$37,450 / Annually
HOA Fee
$1,600 / Annually

Market Snapshot

The Greenwich Market

Single Family · trailing 12 months

Median Days on Market

50

47 active listings

Median $ / Sq Ft

$889

47 active listings

Sale-to-List Ratio

101.3%

207 sales

How this home compares

List Price

$6.15M

vs $3.60M median

70.9% above median

Price / Sq Ft

$1,001

vs $889 median

12.6% above median

Days on Market

54 days

vs 50 days median

4 days longer than median

Based on 47 active and 207 closed sales (trailing 12 mo) of single family in Greenwich. Source: SmartMLS · As of November 2, 2026.

Location

21 Calhoun Drive, Greenwich, Connecticut

Property + 12 nearby

Estimate Your Payment

Estimated Monthly Payment

Rates: Freddie Mac PMMS via FRED
$38,834

per month

  • Principal & Interest$33,530
  • Property Taxes$3,121
  • Insurance$2,050
  • HOA$133

Estimates only. Actual rates, taxes, insurance, and HOA fees vary. Consult a lender for current rates.

Location

City/Town
Greenwich
Neighborhood
N/A
County
Fairfield

Residence

Property Type
Single Family
Style
Tudor
Year Built
1923
New Construction
No/Resale
Living Area
6,143 sq ft

Schools

Elementary
Glenville
High
Greenwich

Interior

Heating
Hot Water
Heat Fuel
Natural Gas
Cooling
Central Air
Fireplaces
6
Laundry
Lower LevelMain Level
Appliances
Gas RangeWall OvenMicrowaveRefrigeratorFreezerDishwasherWine Chiller
Basement
Full

Exterior & Lot

Lot Size
1.80 acres
Zoning
RA-1
Garage / Parking
3 garage spacesAttached Garage
Waterfront Details
Not Applicable
Water Source
Public Water Connected
Sewer
Septic
Pool
Indoor Pool
Construction
BrickStucco
Roof
ShingleSlate
Foundation
Stone
Exterior Features
Patio
Lot Description
Level Lot

HOA / Association

Fee
$1,600 / Annually

Listing & Financials

Property Taxes
$37,450 / Annually
Days on Market
54
MLS #
24205524
MLS Status
Active

Similar Properties

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Listed By

Danielle Malloy

(203) 921-9987

Serhant Connecticut, LLC

(203) 489-7800

This information is believed to be accurate, but without warranty.

The IDX display contains information sourced from SmartMLS, Inc. as of 11/2/2026. This information is provided for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing or leasing. Data is deemed reliable but is not guaranteed accurate by the MLS, the listing broker, the listing agent, or Matt Caiola. Buyers and tenants should independently verify all information that matters to their decision.

Map locations may be approximate. Any offer of compensation, if applicable, is made only to participants of the MLS where the listing is filed. ©2026 Smart MLS, Inc. All rights reserved.

Data last updated on 11/2/2026 at 9:15 PM UTC.