Call him the king of the block. Ken Griffin has been on a shopping spree and he isn’t done buying.
The Citadel founder and hedge fund billionaire quietly scooped up a duplex at 740 Park Ave. this month for $38 million in an off-market transaction, sources told the Wall Street Journal.
The unit sits directly next door to the apartment he purchased last year for $45 million from Julia Koch, widow of the billionaire industrialist David Koch.
The seller, who acquired the unit through a trust for $20.5 million in 2019, has not been publicly identified.
When the duplex last hit the open market in 2018 with a $22.5 million ask, it boasted roughly 7,500 square feet across five bedrooms, featuring no fewer than 41 windows, 21 closets and three woodburning fireplaces.
Marketing photos revealed a library, a formal dining room, a private elevator vestibule and a grand foyer anchored by a sweeping curved staircase. Whether subsequent owners touched any of it remains unknown.
The address itself needs no introduction. Built around 1930 by James T. Lee, grandfather of Jacqueline Kennedy Onassis, 740 Park has long been the city’s most coveted cooperative.
Cosmetics heir Ronald Lauder has called it home, as has hedge fund billionaire Israel Englander. So has much of New York’s old-money aristocracy. Even as demand for trophy co-ops softens citywide, this building holds its ground.
Griffin’s intentions for the latest acquisition are unclear. The Post has reached out for comment.
The financier already owns an apartment at 220 Central Park South, widely regarded as the finest condominium tower in the city, for which he paid roughly $238 million — a national record — in 2019.
Beyond Manhattan, his property portfolio spans a $122 million London mansion steps from Buckingham Palace, an $84.45 million Hamptons compound, and a collection of residences across Miami Beach and Palm Beach, including the $1 billion home dubbed the most expensive in the world.

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