The Willis Tower (formerly named, and still commonly referred to as the Sears Tower), is a 108-story, 1451 ft. skyscraper in Chicago, Illinois. Designed by Skidmore, Owings & Merrill in 1973, it was the tallest building in the world, surpassing the World Trade Center Towers in New York, it held this rank for nearly 25 years. The Willis Tower is the tallest building in the United States and the fifth-tallest freestanding structure in the world, as well as the fifth tallest building in the world to the roof.
Although Sears’ naming rights expired in 2003, the building continued to be called the Sears Tower for several years. In March 2009, London-based insurance broker, Willis Group Holdings, agreed to lease a portion of the building and obtained the building’s naming rights. On July 16, 2009, the building was officially renamed the Willis Tower.
VDA has provided consulting services for Quality Control Evaluations and code inspections of 101 elevators.
In January 2009, the Willis Tower owners began a major renovation of the Skydeck, which included the installation of glass balconies extending from the building that offer views straight down over the city of Chicago.