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12th-floor Upper East Side co-op, once owned by copper heiress Huguette Clark and famously uninhabited, has sold to Chella Safra for $37.5 million. The deal includes two units in the limestone building overlooking Central Park. The sale appears to be off-market, with no public listing or marketing efforts. The co-op last traded in 2012 when hedge fund founder Boaz Weinstein bought it for $25.5 million.

    Clark's ownership of the apartment is notable due to her reclusive nature and extensive collection of French dolls. She spent over 20 years living in hospitals despite being healthy, and owned three apartments in the building, including a top-floor unit that was listed for sale with other units in 2012 for $55 million. The listings at the time featured no interior photos, and only a select few were allowed to view the properties.

    Clark's family history is also significant; her father, William Clark, was one of the richest men in America in the early 1900s and briefly served as a senator in Montana. Her mansion in New Canaan, Connecticut sold for $14.3 million in 2014 to Reed Krakoff and his wife.

    The buyer, Chella Safra, is the widow of Brazilian banker Moise Safra, who passed away in 2014 at the age of 79. The couple was known for their philanthropic work supporting Jewish organizations globally.