Mark David Though their acrimonious, tabloid-reported divorce was finalized about two years ago, powerhouse television writer/producer Steve Levitan, creator of the megahit sitcom “Modern Family” and, before that, the David Spade-starring series “Just Shoot Me!”, and Krista Levitan are just now getting around to selling their beachfront family home that overlooks Lechuza Cove at the sandy western end of Malibu’s Broad Beach.Priced at just under $16 million, the unconventional multi-story Cape