Rothenburg ob den Tauber

The "four walls" system of film production (also known as the "four wall system") refers to a system whereby a film production company rents a sound stage and associated space but then contracts separately for additional facilities and hires freelance staff. The four walls system became prominent in the 1960s  , following the demise of the Hollywood studio system from 1948 . Some big studios, like Pinewood Studios in England, became "four walls" facilities  for independent film producers and television companies. These facilities no longer engage in the development or distribution of films.