The Book Tower is a 145 m (476 ft), 38-story skyscraper located at 1265 Washington Boulevard in Downtown Detroit, Michigan, within the Washington Boulevard Historic District. 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 encased in 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.