It used to be the Sears Tower, but now it’s just the Willis Tower. Until 2014, when the new World Trade Center was completed in New York City, the Sears Tower was the tallest structure in the Western Hemisphere.
I would assume that the bust dangling in the middle is Dr. Fazlur Rahman Khan, the tower’s celebrated architect, but it’s hard to say. He passed away in 1982, but Khan was honored with a Google Doodle on the 88th anniversary of his birth this year.