A storied equestrian estate once owned by Margaret Carnegie Miller, the only daughter of industrialist and philanthropist Andrew Carnegie, is set to go under the hammer in New York’s Hudson Valley. Known as Hallmark Farm, the 185-acre property in Millbrook will be offered through Platinum Luxury Auctions with a reserve price of $7.95 million, presenting buyers with a rare opportunity to own one of the region’s most historically significant country estates.
Originally listed for $20 million, the estate combines Gilded Age heritage, exceptional equestrian facilities, and panoramic Catskill Mountain views.
A Historic Estate With Carnegie Family Provenance
Dating back to 1865, Hallmark Farm became part of the Carnegie family’s expansive countryside holdings during the 1920s when Margaret Carnegie Miller acquired the property as her private retreat and elk preserve.
According to Platinum Luxury Auctions, the estate was once used for lavish country gatherings, fox hunts, and outdoor events that reflected the grandeur of America’s Gilded Age. Long stretches of open land even served as private landing strips for the Carnegie family’s aircraft.
Representatives familiar with the offering shared with californialuxuryhouses that Hallmark Farm’s distinguished ownership history continues to be one of its strongest selling points, giving the property a level of provenance rarely found in today’s luxury real estate market.
Timeless Architecture Meets Modern Luxury
The estate encompasses more than 13,700 square feet across several structures, anchored by a stately main residence featuring classic architectural details and modern conveniences.
Elegant wood-paneled rooms, multiple fireplaces, a library, formal entertaining spaces, an elevator, and a professionally equipped chef’s kitchen blend historic craftsmanship with contemporary comfort.
Surrounded by mature trees, rolling meadows, and beautifully maintained grounds, the residence enjoys sweeping views of the Catskill Mountains while offering exceptional privacy.
A Premier Equestrian Property in the Hudson Valley
Designed for horse enthusiasts, Hallmark Farm features a fully equipped 10-stall barn, tack room, paddocks, riding trails, and dedicated staff accommodations.
The expansive 185-acre property also includes woodlands, open pastures, and a private pond, creating an ideal setting for equestrian pursuits, outdoor recreation, or a private country retreat.
Trayor Lesnock, founder and CEO of Platinum Luxury Auctions, noted that the estate’s Carnegie connection adds extraordinary appeal, comparing its historical significance to the provenance that increases the value of collectible works of art.
The auction team also told californialuxuryhouses that historic estates with this combination of architectural pedigree, acreage, and equestrian amenities seldom become available in the Hudson Valley.
Living in Millbrook, New York
Often regarded as one of the Hudson Valley’s most prestigious communities, Millbrook is known for its scenic countryside, luxury estates, vineyards, private clubs, and equestrian culture.
Residents enjoy convenient access to hiking, fine dining, boutique shopping, and outdoor recreation while remaining within a reasonable drive of New York City. The area’s privacy and natural beauty have long attracted business leaders, celebrities, and high-net-worth families seeking a peaceful country lifestyle.
A Rare Opportunity to Own a Piece of American History
Few luxury properties combine architectural heritage, celebrity provenance, and expansive countryside living as successfully as Hallmark Farm. From its roots in the Carnegie family legacy to its world-class equestrian amenities, the estate represents one of the Hudson Valley’s most remarkable offerings.
While californialuxuryhouses reached out for additional information regarding the property’s restoration history, no further details were available before publication.