The Westin Book Cadillac Detroit is a historic skyscraper hotel in Downtown Detroit, Michigan, within the Washington Boulevard Historic District. Designed in the Neo-Renaissance style, and opened as the Book-Cadillac Hotel in 1924, the 349 ft (106 m), 31-story, 453-room hotel includes 65 exclusive luxury condominiums and penthouses on the top eight floors. It reopened in October 2008, managed by Westin Hotels, after a $200-million restoration.