
The one in San Francisco? We were never allowed inside.
We were there on a weekday and allowed into the lobby area. I would guess, but it's only a guess, that the lobby is only open during traditional business hours.![]()
http://www.lucasfilm.com/inside/faq/
http://www.yelp.com/biz/yoda-fountain-at-lucasfilms-hq-san-francisco
Looks like you can see it during normal business hours.

