Filmmaker George Lucas has requested county approval for a remodel of a 317,000-square-foot Nicasio ranch known as Big Rock Ranch, to convert office space into 57 private rooms. According to a spokesperson, Tom Forster, the rooms will be set aside for Lucasfilm Ltd. clients—the biggest of which is the Walt Disney Company—so that people do not have to commute to hotel rooms in San Rafael or San Francisco. That luxury, Mr. Forster said, should help relieve traffic congestion on Lucas Valley Road. “That is the case, and has been the case, for the lodging that we have at Skywalker Ranch,” Mr. Forster said. “We’re simply seeking to replicate the types of amenities that we do at Skywalker that we do at Big Rock.” The ranch contains multimedia offices, a private theater, a cafeteria, dining room, a daycare and fitness center and storage. The new plans also call for upgrading the kitchen and general store, and expanding the meeting rooms and fitness facilities. The request follows an earlier request in April by Mr. Lucas to build 224 affordable housing units at the nearby Grady Ranch; both ranches—as well as the larger, adjacent Skywalker Ranch—are owned by Skywalker Properties Ltd., Mr. Lucas’s property management company that also includes the San Francisco-based Letterman Digital and New Media Arts Center where the mega-studio Lucasfilm Ltd. is headquartered.