The Citadel founder paid $45 million for a duplex at 740 Park Ave. that had been owned by Julia Koch, the widow of billionaire businessman David Koch, according to people familiar with the matter.

Julia Koch, the widow of billionaire industrialist David Koch, has sold her duplex at the exclusive Manhattan co-op 740 Park Avenue for $45 million, according to property records. The Kochs paid ...

David 'Kochie' Koch has taken his wife Libby out for a night on the town. The couple headed to the 2025 AFL Season Launch at Luna Park in Sydney on Tuesday night. The former Sunrise host ...