The Yay Factory is a secret factory producing Drugs by the Loco Syndicate. It is located in Doherty, very close to the driving school. It is a large complex consisting of warehouses and storage buildings, and various tanks and other drug-manufacturing machinery can be found inside of them. There are also various shipping containers scattered about the facility, and the entire complex is surrounded by a wall.
In the mission Yay-Ka-Boom-Boom, Carl sets out to blow the Yay Factory up with a car bomb. His attack is successful, as the explosion severely damages much of the facility's drug manufacturing equipment, and Carl kills most of the workforce. When Carl tries to escape in the car, he jumps over the wall; this is also a unique stunt jump that can be accessed during free-roam. The facility becomes abandoned after this mission.