The Chateau Villette, home to Professor Teabing in “The Da Vinci Code,” exists in real life 40 miles northeast of Versailles. Owned by Bay Area realtor Olivia Hsu Decker (who also boasts property in Provence and Marin County), the expansive Chateau is a private residence, albeit one that’s kind to filmmakers.“Code” had full access to shoot on the grounds, and past projects have ranged from fashion shoots to Jaguar commercials. Individual rooms can be rented, and a six-day “Da Vinci Code” tour is available to paying guests. Don’t have a reservation? Then don’t bother: Daytrippers are about as welcome as Dan Brown is with Opus Dei.