Hedge fund billionaire Ken Griffin appears to be expanding his business presence in Miami, adding to his already sizable real estate portfolio.The Citadel founder partnered with Goldman Properties to purchase the 545Wyn office building for $180 million from Chicago-based developer Sterling Bay, according to the South Florida Business Journal.Anonymous sources close to the deal told the outlet that Griffin is a partner in the purchase, though the listed buyer is Goldman Properties CEO Scott Srebnick.Neither Citadel nor Goldman Properties immediately responded to Fox News Digital’s request for c...

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