What was the former name of the United center

The Chicago Stadium was across the street on the north side of Madison St. The United Center replaced it 25 years ago.

United Airlines paid about $1.8 million per year until 2014 for its naming rights. United merged with Continental Airlines in October 2010, retaining Continental’s logo and corporate look. The arena continued to use United's tulip logo for the duration of the 2010–11 season. For the 2011–12 season, all the previous United signs were replaced with the globe logo. Two new lit signs on the east and west ends of the arena saying "United Center" with the United globe in the middle were revealed below the upper level suites complimenting the former "Madhouse" signs on the north and south sides. In December 2013, it was announced that an agreement had been reached to keep United's naming rights for the arena for another 20 years. The United Center will see a series of updates and upgrades to the interior and exterior of the building. New signage, additional LED boards, and other elements have been added after reaching this agreement.