Mar-a-Lago was intended to be a "Winter White House"?

Marjorie Post willed the 17-acre (69,000 m2) estate to the U.S. Government as a retreat for Presidents and visiting foreign dignitaries.

Why did Trump put in 3 bomb shelters?

Coincidence?

https://web.archive.org/web/20160213113711/https://en.wikipedia.org/wiki/Mar-a-Lago