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…