One real-estate writer explains the successful formula for McMansions: symmetrical structures on clear-cut lots with Palladian windows centered over the main entry, and brick or stone enhancing the driveway entrance, plus multiple chimneys, dormers, pilasters, and columns - and inside, the master suite with dressing rooms and bath-spa, great rooms, breakfast and dining rooms, showplace kitchen, and extra high and wide garages for multiple cars and SUVs.