Comment No, it's not Mies van der Rohe (Score 4, Interesting) 65
That's not anything like a Mies van der Rohe building. Rohe was a form-follows-function glass box architect. He did some of the best glass boxes of the 20th century, notably the IIT campus in Chicago. His work is very rectangular.
Wright did more unusual forms. In his later years, he designed the Marin Civic Center which Lucas, being from Marin, would have seen. It's been called the Martian Embassy. It's so alien it's been used in several science fiction movies. Like most Wright buildings, it's nicely integrated with the terrain.
Here's the park that must be destroyed to build to satisify Lucas' ego.