Tower City Center, originally known as Cleveland Union Terminal, is a large mixed-use facility located on Public Square in downtown Cleveland, Ohio. The facility is composed of a number of interconnected office buildings, including the landmark Terminal Tower, a shopping mall, a casino, two hotels, and the main hub of Cleveland's four rapid transit lines. On March 17, 1976, the tower was added to the National Register of Historic Places as the Union Terminal Group.Construction and train stationThe Cleveland Union Terminal was built by the Van Sweringen brothers as a terminal for all trains coming into Cleveland via the various railroad lines in a concept similar to Grand Central Terminal in New York City. The facility also included a number of retail stores and restaurants. Original designs for the complex show that at first the brothers did not plan on building an office tower within the complex. However, they eventually decided to build the 52-story Terminal Tower on the northeast side of the complex facing Public Square. From its completion until 1964, the Terminal Tower was the tallest building in North America outside of New York City. Cleveland Union Terminal also served as the downtown station for the Van Sweringens' new Shaker Heights Rapid Transit Line.