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 ...

Around $700 million. Julia Koch, widow of mega rich and controversial American industrialist David Koch Sr., and her three ...

Julia Koch, one of the world’s richest women with an estimated net worth of $74.2 billion, according to Forbes, has just sold her co-op at the exclusive Park Avenue palace for $45 million ...