when did the sears tower change to the willis tower
Willis Tower 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.[44] On July 16, 2009, the building was officially renamed Willis Tower.[45] On August 13, 2012, United Airlines announced it would move its corporate headquarters from 77 West Wacker Drive to Willis Tower.[6]
Tower of the Americas Construction of the tower began on August 9, 1966 and was completed in approximately 18 months, just in time for the opening ceremonies for the fair held on April 6, 1968. The tophouse of the building was constructed at ground level and hoisted to the top of the poured concrete shaft. As the tophouse was being hoisted into place, on October 30, 1967 some of the cables used to hoist it snapped, leaving it resting on and precariously tilted on the Towerâ€™s shaft. Eventually, oil field pipes were used in lieu of cables to complete the job.