If you know someone that works there they can take you on a tour of a bunch of areas, but they have to escort you the whole time.
A little bit! At the front desk there is a large waiting room, in it there is a wall long vestibule with memorabilia. That is as far as you can get. Outside the front doors there is a really cool statue of Yoda though.
You can walk around the area, see the Yoda fountain, but you cannot go inside in any buildings
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