Chicago Foundation, and the Museum of Science and Industry. With an estimated completion date of 2020, the Barack Obama Presidential Center will be housed at the University of Chicago in Hyde Park and include both the Obama presidential library and offices of the Obama Foundation. The Willis Tower (formerly named Sears Tower) is a popular destination for tourists. The Willis Tower has an observation deck open to tourists year round with high up views overlooking Chicago and Lake Michigan. The observation deck includes an enclosed glass balcony that extends 10 feet out on the side of the building. Tourists are able
Willis Tower unfinished World Trade Center to become the world's tallest building. The height was restricted by a limit imposed by the Federal Aviation Administration (FAA) to protect air traffic. The financing of the tower was provided by the Sears company. It was topped with two antennas to permit local television and radio broadcasts. Sears and the City of Chicago approved the design, and the first steel was put in place in April 1971. The structure was completed in May 1973. The construction cost about US$150 million at the time, equivalent to $ million in 2019. By comparison, Taipei 101, built in