Mr. Slave's house is built differently to every other house in South Park. It is only one story high, with an adjoining garage to the left. It is colored red with a white door and silver garage.
Mr. Slave's house has a front room shown, most likely a living room. In South Park: The Stick of Truth a kitchen and bedroom are shown.
Mr. Slave's House appears briefly in the game. Mr. Slave gives his sidequest here to pick up his package. When you give it to him he tells you that you can now summon him in battles.