Chicago Board of Trade Building percent of available space, while financial and trading concerns occupy 54 percent of the three-building complex. In addition to Ceres Cafe on the first floor of the lobby, other businesses provide banking, insurance, travel services, beauty services, and healthcare. Some business have been in the building for over 40 years, and throughout its history, commodities speculators, such as "Prince of the Pit" Richard Dennis, have maintained offices in the building. In 2007, the U.S. Futures Exchange, a competitor of the CBOT formerly known as Eurex US, announced a move from the Sears Tower into the 14th floor of the CBOT
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