bubbles, you can use everything in CAS and practically everything in build/buy mode (the only exception I can think of is the Wishing Well from Lucky Palms). As for the buildings from University Life, if you want the comic store or bowling alley, you can get them by putting a copy in the library, so it will be available when you open Edit Town at the beginning of your game. Incidentally, the bookstore sells comics. Hope this helps.