Ken Griffin has bought a unit in NYC's most powerful co-op, 740 Park Ave. Early Grace Hedge fund billionaire Ken Griffin has expanded his high-end real estate empire with the $45 million purchase ...

The identity of the buyer was unclear at the time, but the Wall Street Journal reported it was Citadel founder Ken Griffin who plunked down $45 million for the home at 740 Park Avenue.

740 Park Avenue has 31 units, including duplexes and triplexes. Photo: @elikarealestate/Instagram Fashion designer Vera Wang owns a property at 740 Park Avenue.

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.

Early Grace Manhattan’s storied 740 Park Ave. has once again seen another prominent property sale. Julia Koch, one of the world’s richest women with an estimated net worth of $74.2 billion ...

Now, he’s added yet another trophy to his real-estate holdings: a duplex at New York’s most storied cooperative, 740 Park Avenue.

And more than a few residents have been the subjects of tabloid scandals. 740 Park was once home to one of the world's largest private collections of Mark Rothko works. The former owner ...

Photo is of a home recently listed at 740 Park; not owner's actual residence Not all residents are in finance. Fashion designer Vera Wang paid $23.1 million for her father's residence at 740 Park ...

Ken Griffin spent $45 million on a duplex in Manhattan's 740 Park Avenue.STAN HONDA/Getty Images Billionaire Ken Griffin bought a duplex in Manhattan for $45 million. Griffin owns over a quarter ...

The month’s biggest closed sale took place at 740 Park Avenue, the venerable co-op with many high-profile residents. Katherine Marks for The New York Times Julia Koch sold a duplex there that ...