Blackstone to invest $500 million in overhaul of Chicago's Willis Tower

The ticker and trading information for Blackstone Group is displayed at the post where it is traded on the floor of the New York Stock Exchange (NYSE) April 4, 2016.

REUTERS/Brendan McDermid/File Photo

Blackstone to invest 0 million in overhaul of Chicago"s Willis Tower
Blackstone to invest 0 million in overhaul of Chicago"s Willis Tower
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