Book Tower is a 145 m (476 ft), 38-story skyscraper in the Washington Boulevard Historic District of Detroit, Michigan. Construction began on the Italian Renaissance-style building in 1916 as an addition to the original Book Building and finished a decade later.
Designed in the Academic Classicism style, it is 475 feet (145 m) and 38 stories tall (not including two basement levels), with two mechanical floors at the top encasing the green copper roof, a roofing style shared by the nearby Westin Book-Cadillac Hotel. Retail and gallery floors used to reside on the first and second floors, with businesses previously occupying the rest. The building is currently unoccupied.