The Citadel honcho has decamped to Florida -- and is in the process of cutting ties with the city that he once called home.

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The unfinished 37th and 38th floors at No. 9 Walton sold for a combined $19 million, the most-expensive residential sale this year.

The hedge fund founder never moved into the two offloaded dwellings, which were part of a record-breaking four-unit deal in 2017