|The First Federal Building meets National Register of Historic Places criterion 'A' under Community Planning & Development as one of the major buildings in a downtown building boom that followed in the wake of the massive public investment in the development of a new Civic Center complex in the heart of Detroit's downtown in the 1950s. Along with First Federal, this small group of late 1950s-early 1960s buildings, including the National Bank of Detroit (Chase Bank) Building, Michigan Consolidated Gas Company Building (One Woodward Avenue), and 211 West Fort Street Building, brought about a major transformation in the downtown skyline from the last major development in the late 1920s. The First Federal Building meets National Register criterion 'C ' under Architecture as a prime example of Modernist, tall office building design in Detroit's downtown, notable for its planning with open plaza space around it and for its use of a highly distinctive material, dark brownish granite from Minnesota, as its exterior cladding material in contrast to the other new downtown office towers, which used more typical light-colored concrete aggregate panels, marble or enameled aluminum panels. The building is also significant in architectural terms as a major 1960s project of the old and leading Detroit architectural firm of Smith, Hinchman & Grylls (SH&G). Construction began in 1963, a formal dedication was held in June, 1964, and the building was fully completed and opened to the public in 1965.