CHICAGO (WLS) -- Sources say the Blackstone Group is the possible buyer of Chicago's iconic Willis Tower.
The private equity firm is said to have a preliminary deal to pay nearly $1.5 billion for the 110-story building.
But the current deal for the naming rights doesn't expire until 2025, so it appears it will remain the Willis Tower.
Blackstone Group may buy Willis Tower for $1.5B, sources say
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