Sam Zell, a Chicago real estate magnate who earned a multibillion-dollar fortune and a reputation as “the grave dancer” for his ability to revive moribund properties died on Thursday. He was 81. Zell died at home due to complications from a recent illness, according to Equity Group Investments, a company he founded in 1968. By the time he reached his 70s, he had amassed a fortune estimated at $3.8 billion. Zell sold Equity Office, the office-tower company he spent three decades building, to Blackstone Group for $39 billion in 2007. It was the largest private equity transaction in history, and...