48 (A)Every year, 1.5 million visitors come to take the 70-second ride in the elevator. (B)It then became the third in height when Taipei 101 was completed in the fall of 2004. (C)The Sears Tower is a 110-story office tower containing a total enclosed area of approximately 4.56 million gross square feet. (D)Additionally, this famous 110-floor city landmark is one of the most efficient office buildings in downtown Chicago as well.