The Marjorie Merriweather Post estate in Palm Beach, Florida. She built the house with her (then) husband, Edward F. Hutton. The house was designed by Joseph Urban. It was declared a National Historic Landmark in 1980. The 118-room, 110,000 sq ft estate is owned by Donald Trump who holds 51% ownership and ex-wife Ivana Trump who holds 49% ownership. The house itself is 62,000 sq ft.
Homes - Famous, Homes - Celebrity - Business
Links: en.wikipedia.org, www.maralagoclub.com