Regency Key
Regency Real Estate
The Key To Your New Home
← Back to Search
MLS 24219917 For Sale Updated November 10, 2026
451 Mansfield Avenue

Darien, Connecticut 06820

$6,985,000
On market 1 day
451 Mansfield Avenue
1 / 40

About This Property

Set back from the road on 2.7 beautifully landscaped acres, 451 Mansfield Avenue offers the privacy, grandeur, and distinctive character of a true country estate. A sweeping circular drive introduces a grand residence distinguished by its striking stone facade and timeless architectural detailing, a substantial two-story guest house, and a magnificent outdoor setting centered around a 24' x 48' infinity-edge pool. Extensive custom stonework, elegant terraces, and lush grounds enhance the property's distinctive estate-like character. Extensively renovated in 2026, the residence features all- new mechanical systems, new windows, and thoughtfully redesigned interiors. Blending timeless architectural elegance with sophisticated contemporary luxury, the home offers approximately 9,000 square feet of finished living space, including a light-filled 1,600-square-foot walk-out lower level. Inside, a graceful, curved staircase rises from the herringbone-floored foyer, introducing beautifully proportioned rooms, distinctive millwork, and refined architectural detailing. Formal living and dining rooms, each with a custom marble fireplace, provide gracious entertaining spaces, while a richly paneled library with coffered ceiling and fireplace offers a distinguished private study.

Property Details

Interior

Heat
Hot Air — Propane
Cooling
Central Air
Fireplaces
6
Basement
Full,Heated,Sump Pump,Storage,Garage Access,Cooled,Partially Finished
In-Law Apartment
Possible
Interior Features
Sauna

Exterior & Lot

Roof
Slate
Construction
Construction
Pool
Gunite,Heated,Infinity Edge,Salt Water,In Ground Pool
Lot Description
Lightly Wooded Dry Professionally Landscaped
Garage & Parking
Attached Garage

Utilities & Systems

Water Source
Public Water Connected
Sewer
Public Sewer Connected

Community & Schools

Elementary
Per Board of Ed
High
Per Board of Ed

Appliances

Included
Gas Range Wall Oven Microwave Range Hood Subzero Dishwasher Washer Electric Dryer Wine Chiller

451 Mansfield Avenue

Darien , Connecticut 06820

$6,985,000

On market 1 day

Beds
7
Baths
11
SqFt
9,058
Type
Single Family
County Fairfield
Garage 4
Rooms -
Lot Size 2.70 Acres
Property Tax $47,118
Assessed Value $3,043,810
Year Built 1999
Style Colonial
Zoning R2

Payment Estimate

30-year fixed. Includes taxes; estimates only.

Estimated Monthly Payment
—
Open the full mortgage calculator →

Property Map

Map location is based on the property address.

Listing information is deemed reliable but not guaranteed and is sourced from the local MLS feed. Brokerage shown: MATT01.

Menu