South Gate Assembly was a General Motors automobile plant located in the Los Angeles suburb of South Gate, California. It opened in 1936 to build B-O-P (Buick-Olds-Pontiac) cars for sale on the west coast. It was the first GM plant to build multiple car lines, resulting from a Depression-spawned move to cut production costs by sharing components and manufacturing. South Gate was the second of several B-O-P "branch" assembly plants (the first being the Buick-operated Linden plant), part of GM's strategy to have production facilities in major metropolitan cities. The location was under the management of GM's newly created Buick-Oldsmobile-Pontiac Assembly Division created in 1945.