ar brick drive and a lawn as manicured as a putting green sits a 30,000-square-foot masterpiece of Italian Renaissance architecture called Casa Nana. John Porter, a real estate associate for Corcoran who oversees some of the largest sales in Palm Beach County, Florida, points out the spiral staircase, built by

ar brick drive and a lawn as manicured as a putting green sits a 30,000-square-foot masterpiece of Italian Renaissance architecture called Casa Nana. John Porter, a real estate associate for Corcoran who oversees some of the largest sales in Palm Beach County, Florida, points out the spiral staircase, famed 19