The previous record, set in 2004, was for the Crosby family estate on Jerusalem Road in Tyringham. It sold for $3.9 million.
In each instance, Cohen & White Associates of Lenox was the listing agency. In the Southmayd Farm sale, Benchmark Real Estate shared the property listing.
Southmayd Farm was owned by Charles Schulze and Carole Schulze, who made the property their primary home.
The 80-acre estate on Interlaken Crossroad, an 1870 Victorian with mansard roof and 8,000 square feet of living space, a carriage house, barns and a studio, is perched on the Housatonic River's western bank, across from the Stockbridge Country Club's golf links.
The property has a pool and guest cottage.
The March 30 filing with the Middle Berkshire Registry of Deeds lists Southmayd LLC as the buyer. State records indicate Southmayd LLC's principal is James D. Kiggen of Verbank, N.Y., in Dutchess County.
Mary Jane White of Cohen & White said the family purchased the property through a corporation to maintain privacy and will live in the house year-round.
"They want to be anonymous and move into the community in a way that's least disruptive to the community," she said. "They are not celebrities, and they are not developers."
The property drew interest from one prospective buyer who wanted to purchase the house and build condominiums along the river; another was the operator of a private school, said one town official.
Southmayd was on the market for a couple of years, initially listed for more than $8 million.
Cohen & White and Benchmark Real Estate took the listing in October and advertised it for $7.5 million. A contract for $6.9 million was signed in January, according to White.
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She said that Southmayd Farm was built by Charles Southmayd, a wealthy New York lawyer, as a summer "cottage," at around the same time that the Naumkeag estate was built by Joseph Hodges Choate on Prospect Hill.
Naumkeag, a museum operated by the Trustees of Reservations, attained rank this week as a National Historic Site by the U.S. Department of the Interior. Southmayd Farm has remained a private residence.