David Koch, an American billionaire known for donating to conservative political causes, has died at age 79.
The late philanthropist, who was worth an estimated $58.7 billion when he died (per Bloomberg), owned at least $143 million worth of real estate in New York City, the Hamptons, Aspen, Colorado, and Palm Beach, Florida.
Koch's primary residence was an $18 million, 18-room duplex in an ultra-exclusive Manhattan building.
In 2018, he paid cash for a $40.25 million Manhattan townhouse.
