Washington Boulevard Historic District is a multi-block area of downtown Detroit, Michigan. It consists of structures facing Washington Boulevard between State and Clifford Streets. In 1982, it was added to the National Register of Historic Places. It includes the Book-Cadillac Hotel, the Book Tower, the Industrial-Stevens Apartments, and Washington Square (Trolley Plaza) among other architecturally significant buildings. Washington Boulevard is one of the city's main boulevards and part of Augustus Woodward's 1807-design for the city.