In 1924, Detroit's Book-Cadillac opened as the world's tallest hotel (it is now a re-developed Westin Book-Cadillac Hotel). Completion of the first phase of the Renaissance Center in 1977 restored this distinction to the city. The Renaissance Center's central tower opened with a flagship hotel, the tallest in the world, and a conference center with the world's largest rooftop restaurant. As of 2012 the hotel is Marriott International's largest in the United States, with 1,298 rooms. Though it is no longer the world's tallest hotel, it remains the tallest all-hotel skyscraper in the Western Hemisphere. The Westin hotel and conference center at the Southfield Town Center is across from Lawrence Technological University.