CNA Center is a 622-ft (189m), 44-story high-rise building at 333 South Wabash Avenue in the Loop of Chicago, Illinois. The building is well known for lighting logos or messages on the front side of the building or for its dark red color. It is the tallest red building in Chicago. Construction began in March 1970. The building was finished in 1972 and was open to the public in 1973.