The structure of Sears Tower in Chicago is

Tree cells are honeycomb-shaped. Willis Tower is a skyscraper located in Chicago, Illinois, USA. Originally known as Sears Tower, it was completed in 1

The structure of Sears Tower in Chicago is

Tree cells are honeycomb-shaped. Willis Tower is a skyscraper located in Chicago, Illinois, USA. Originally known as Sears Tower, it was completed in 1974. Sears Tower in Chicago (now known as Willis Tower) enjoys the title of the tallest building in the world from 1974 to 1998, but in recent decades, the record of this tall building has been broken.

The original owner, Sears-roebuck Company of the United States, moved out on 1992, and the building has been owned by the real estate investment group established in 2004. In 2009, it was officially renamed Willis Building. Sears Tower has 1 10 floors and was once the tallest office building in the world. About 65438+6500 people come to work here every day. There is an observation deck on the 103 floor for tourists to overlook the whole city. 4 12 meters above the ground, you can see four States in the United States when the weather is clear.