A little known structure in San Anselmo, California, 321 San Anselmo Ave. housed Lucasfilm LTD. and Sprocket Systems before Skywalker Ranch was built. Portions of post-production, sound and picture editing for many known films including Star Wars: Episode V - The Empire Strikes Back, Raiders of the Lost Ark, E.T. The Extra-Terrestrial, and Alien were completed here.—Eric Mansur