185-acre equestrian estate that once belonged to the Carnegie family heads to auction
Photo credit: Alon Koppel and Tim Lee
Previously asking $20 million, this private Hudson Valley estate on 185 acres heads for auction this month, starting at or above $7.95 million. Located in Millbrook Hunt Country, the property, which offers mountain views in every direction, once served as the rural retreat of Andrew Carnegie’s daughter, Margaret Carnegie. In addition to that legacy, the estate’s top-tier equestrian facilities include a 10-stall barn with a tack room, staff housing, and paddocks enclosed with post-and-rail fencing, some with field shelters. The property also features miles of fenced pasture and private riding trails.
Several buildings, adding up to 13,700 square feet, sit on the property. In all, there are nine bedrooms and nine full baths. The main residence has been updated for modern living and entertaining.
The living room opens beneath 20-foot ceilings, anchored by a fireplace. French doors open to a terrace for outdoor living surrounded by mountain views.
The kitchen stands ready for dining and entertaining a crowd of any size with Viking and Bosch appliances, joined by a breakfast room and a large formal dining room. A paneled library has a working fireplace.
Upstairs, the private primary suite features a sitting room and dressing room in addition to a luxurious bathroom. Additional bedrooms offer timeless charm and modern comforts, including an elevator.
A carriage house contains three guest apartments and space for five vehicles. A winter greenhouse keeps the garden growing all year round.
In addition to the aforementioned equestrian amenities, serious equestrians can make use of a hunter trial course. There are two farm-manager apartments on the property in addition to groom accommodations and utility facilities.
There are numerous terraces and a gazebo for outdoor living close to home. The surrounding acreage provides the very essence of country life, with rolling meadows, woodlands, a private pond, and rolling lawns.
Millbrook is home to Millbrook Hunt, Mashomack Polo Club, Tamarack Preserve, and Sandanona hunt clubs, offering access to riding, polo, upland shooting, sporting clays, angling, hiking, golf, wineries, and outdoor recreation. The nearby village offers shopping and dining just minutes away, all just 90 minutes from Manhattan.
Previously asking $20 million, the prized property is offered for $7.95 million or above in an auction that begins Thursday, July 9, 2026, at 7 p.m.
Previews are by appointment, through July 8, 11 a.m.to 5 p.m. daily.
RELATED:
