Detroit/Hamtramck Assembly, also called Factory Zero, is a General Motors automobile assembly plant straddling the border between Detroit and Hamtramck, Michigan. It is located about three miles (five km) from GM's corporate headquarters. When the facility opened, it was built on the original "Dodge Factory" location that was built in 1911, which was closed in 1980 and demolished in 1981, and the new GM factory built vehicles for GM's "BOC" (Buick/Oldsmobile/Cadillac) Group. The first vehicle, a Cadillac Eldorado, rolled off the assembly line on February 4, 1985.