At that time the Duponts and Rockefeller were probably the wealthiest families. Joe Kennedy made a ton of money buying land in mid-town Manhattan in 1942 when it appeared that the U.S. would lose the war. Jean Paul Getty probably the wealthiest individual.
Fred Trump made a ton of money buying land in Queens in the 1950's. He took advantage of a power vacuum in NYC when John D Rockefeller II health started to fail. The elder Trump was a cold. hard man who didn't mind stepping on toes to get what he wanted. He played the Julius Caesar card well splitting the Italians into opposite camps. NY Mayor Vincent Impellitteri was his ally while he froze out Andrea Cuomo.
John D Rockefeller II, missed out on the WiFi party. The bio says that the studio Lamar and Anthiel worked in belonged to JFK but I suspect Joseph Kennedy actually owned it.

