We hear that the mystery buyer of the full-floor apartment at 4 E. 66th St. is Charles Payson “Chase” Coleman III.

Coleman and his wife, Stephanie — who paid $52 million for the fifth floor — already own the building’s sixth floor.

We also hear it was a brokerless deal.

Coleman, a direct descendant of Peter Stuyvesant — the last Dutch governor of New York — heads Tiger Global Management.