8th-tallest building in the United States ; tallest building constructed in the world. "Essex on the Park". Rank Name Image Height ft (m) Floors Year Coordinates Notes.01 Willis Tower 1,451 (442) N 87389W /.87889N.63583W /.87889; -87.63583 (Willis Tower) Formerly known as Sears Tower; 2nd-tallest building in the United States, joint 14th-tallest. 16.05 Franklin Center 1,007 (307).5N 87385W /.880417N.63472W /.880417; -87.63472 (AT T Corporate Center) Formerly known as the AT T Corporate Center; 13th-tallest building in the United States ; tallest building constructed in Chicago in the 1980s. 69.032 Richard.