A 52-acre waterfront property in the exclusive Fairfield County suburb of Darien has traded hands to a mystery buyer.

The Ziegler Farm, which sits along Long Point Road next to a large estate town officials bought earlier this year for $85 million to head off any potential development proposals, sold just before Christmas via a trustee’s deed to an LLC registered to Stamford law firm Wofsey Rosen.

The sale price was reportedly $57.5 million according to the Wall Street Journal, which first noted the sale citing Leslie McElwreath of Sotheby’s International Realty, one of the listing agents.

The seller was a trust controlled by the heirs of Gilded Age industrialist William Ziegler, who made a fortune in the then-burgeoning baking powder industry, funded three expeditions to find the North Pole and reportedly bought the property for use as a summer home where he died in 1905.

The undeveloped, 52-acre property had been subdivided into a series of large parcels in past years according to town property records, but it’s unclear if any development is planned. The land originally listed for $85 million.