It's more than two years until Conan O'Brien takes over "The Tonight Show," but already he's house hunting around town - and thinking big. The NY Post's Page Six reports that the O'Brien had been scheduled to see a $25 million mansion at the Tower Grove Villa complex in Bev Hills, but there was some event there and he was stopped at the door. The NY-based O'Brien dropped by the late-night show on Friday. This is looking to be a kinder and gentler transition than when Leno took over for Carson - or shall we say when Leno's enforcer, Helen Kushnick, took over.