William Lauder, the ousted executive director and longtime chairman of Estée Lauder Companies — and a scion of the cosmetics empire — has sold his prized co-op at 998 Fifth Ave. for $37.5 million in an off-market deal.

News of that transaction was first reported by the Real Deal. And it comes as the billionaire is looking to shed some homes from his portfolio.

The buyer for the 998 Fifth residence is Evan Cheng, the co-founder and CEO of Mysten Labs, a blockchain infrastructure firm. Cheng, a former senior engineering executive at Meta, paid a significant premium over the $23.5 million Lauder spent on the unit in 2017 — netting the cosmetics heir a $14 million gain over eight years.

The apartment, Unit 6W, is located in one of the most storied buildings along Fifth Avenue, a limestone

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