<Tr> <Th> Added to NRHP </Th> <Td> December 23, 1980 </Td> </Tr> <Tr> <Th> Designated NHL </Th> <Td> December 23, 1980 </Td> </Tr> <P> Mar - a-Lago (/ ˌmɑːr. ə. ˈlɑː. ɡoʊ /) is a resort and National Historic Landmark in Palm Beach, Florida, built from 1924 to 1927 by cereal - company heiress and socialite Marjorie Merriweather Post . The 126 - room, 62,500 - square - foot house contains the Mar - a-Lago Club, a members - only club with guest rooms, a spa, and other hotel - style amenities . It is located on the Palm Beach barrier island, with the Atlantic Ocean to the east and Florida's Intracoastal Waterway to the west . </P> <P> At the time of her death in 1973, Post bequeathed the property to the National Park Service, hoping it could be used for state visits or as a Winter White House . However, because the costs of maintaining the property exceeded the funds provided by Post, and it was difficult to secure the facility (as it is located in the flight path of Palm Beach Airport), the property was returned to the Post Foundation by an Act of Congress in 1981 . </P>

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