Detroit Assembly (also known as Detroit Cadillac, Cadillac Assembly or Clark Street Assembly) was a General Motors automobile factory in Detroit, Michigan on Clark Avenue, south of Michigan Avenue (U.S. Route 12). It began operations in 1921 and Cadillac bodies were supplied by Fleetwood Metal Body in 1921 after Fisher Body assumed operations. It was the second location that built Cadillacs, when Cadillac originally started out as the Detroit Automobile Company, then the Henry Ford Company which was located at the intersection of Cass Street and Amsterdam Avenue.
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In 1902, the Cadillac Motor Company began operations, and began building cars at the all new Clark Street facility in 1921, where the factory manufactured Cadillac models until December 23, 1987, when production of Cadillac's full-size D-bodies moved to Arlington Assembly in Arlington, Texas, while production of downsized FWD DeVille/Fleetwood/Seville models were relocated to Detroit/Hamtramck Assembly and Orion Assembly by 1985. It is approximately 2 miles southeast of the original Lincoln factory located at 6200 West Warren Avenue.
All Cadillac vehicles were built only at this facility, with production of popular selling models later added to Linden, New Jersey, South Gate, California or Arlington, Texas in "knock down kits" starting in the 1930s to meet demand. The bodies were built by Fisher at Fleetwood Plant #18 at 261 W End St, and transferred by rail to Clark Street for final assembly.
From 1984 to 1987, the plant also built the Oldsmobile 88 and Custom Cruiser, and the Chevrolet Caprice and Impala.
Detroit Assembly used the VIN codes "Q" and "9."
The site of the plant was redeveloped into the 88-acre Clark Street Technology Park in 1997 by General Motors and three other partners. It is now the location for Inland Waters Pollution Control.