How Big's My Palace?
aka "My Palace Is Bigger Than Yours", as witnessed from screenshots of palaces in Google Maps. Remember, though, that whilst sheer length (width) of façade might be initially impressive, actual square footage is going to be maximized if there's also significant depth. If you see what I mean. (Lessened, of course, by the doughnut holes of inner quadrangles and courtyards.) Note: screenshots are all of differing scales.