Koch is the widow of David Koch, an ultra-conservative billionaire ... Stephen Schwarzman all called the same unit in the building home. Julia Koch is also the owner of two Upper East Side co ...

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 ...

Billionaire Ken Griffin has added another luxury home to his collection, buying an apartment in one of Manhattan’s most exclusive co-op buildings.

Julia Koch, widow of billionaire David Koch, sold an 18-room spread at ... The socialite heiress was reported in 2022 to be shopping the duplex home for as much as $60 million.

David Koch, a billionaire industrialist ... at Their Longtime Georgia Home ...

The mystery buyer purchased the home using a New York-based ... David was quoted as saying in the book. David was executive vice president of Koch Industries, a Kansas-based company that spans ...