That Studio lot is designed and controlled to change on it's on according the how it's stars raise up in fame and stardom - we do not have control of the studio lot at all and they tell you that in the live play on the studio. So if you want the studio to look nice it will when you reach a high level with all the stars that work there - it will fix itself. All you can do is try things but it will always change back to where it belongs after you leave - by design. It is self-controlled by the game as you're actually playing at growing it's stars and their fame, not by any changes you make to it. At least not according to what the devs said.