The Blackstone Hotel is a historic 290-foot (88 m) 21-story hotel located on the corner of Michigan Avenue and Balbo Drive in the Michigan Boulevard Historic District in the Loop community area of Chicago, Illinois. The Blackstone is famous for hosting celebrity guests, including numerous U.S. presidents, for which it was known as the "Hotel of Presidents" for much of the 20th century, and for contributing the term "smoke-filled room" to political parlance.