Mar A Lago was willed to the U.S. Government in 1973 by the heiress of Post cereal to be A WINTER WHITE HOUSE. But after Jimmy Carter decided to get rid of the property in 1981 Trump bought it in 1985 for roughly 8 million dollars. It sits on 17!!! Acres, has 3 bomb shelters and in 2017 Trumps press secretary (Spicer) revealed it had a 'Sensitive Compartment Information facility' as well. Perhaps a good place to store the nuclear football? (Donald even refers to it as his winter white house, see bottom)

The Smithsonian has an article about Mar-A-Lago. It was built by the baroness of General

Foods and Post cereal. Her name was Marjorie Merriweather Post. Over time, Marjorie went to great lengths to transform the mansion into an official wintertime presidential retreat. She initially spent $7 million building the property in the 1920s...$90 million today.

After using the property for many humanitarian endeavors, she turned to plan B in 1968, which was to make Mar-a-Lago a WINTER WHITE HOUSE, property of the United States. After Marjorie died in 1973, the Post foundation pursued her vision, but after 8 years the federal government offloaded the property because of excessive maintenance costs and when it finally went to market and Trump bought it. Here are four links.

https://youtu.be/DrkuTgujLUs:// (Short 5 Min Documentary: 1:20-1:30)
http://www.smithsonianmag.com/history/history-mar-a-lago-180965214/
https://www.independent.co.uk/news/world/americas/trump-mar-a-lago-history-palm-beach-florida-b1780645.html