Glad we could provide some insight for you from afar...
The Frankenstein Parking Garage was the first parking garage built for Universal Studios Hollywood in the mid 1980's. The garage served as an extension to the Entertainment Center (aka Upper Lot) and provided some much needed parking space for the growing theme park. When Streets Around the World debuted by attempting to theme the theme park into city scape areas (Paris, London, New York, etc), the park had to extend a footprint expansion on top of the structure. This included Fievel's Playland and Theater, Beetlejuice Theater (version 1) and Parisian Courtyard, and Mel's Diner. As time would have it, Back to the Future - The Ride was supposed to be a mirror copied building from Orlando and placed on top of this structure. Needless to say that we all know the amount of vibrations experienced by the structure which in fact prompted Hollywood to stop construction and delay opening for a redesign. This redesign resulted on BTTF going into the side of the hill on the opposite side of the park where Simpsons is today and opening in 1993 instead of 1991 like Orlando's. You can easily see the steel beams planted into the side of the hill to support that ride!
Another little sidetone...you will notice there are no trees anywhere in the park when you are standing on top of the parking structure. The only trees around are all in planter boxes.