“Guess how many acres Mar-a-Lago is.”
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24 acres in Palm Beach and nobody has anything like that,” Trump said at a show jumping event there in 2014. “A big house is on one acre. I have 24. It’s the great estate of Palm Beach.” (Technically, Mar-a-Lago is on 20 acres.)
https://www.townandcountrymag.com/style/home-decor/a7144/mar-a-lago-history/
This article said 17.
“The sale included 17 acres of land and all the original home furnishings. He also later purchased the beachfront property in front of the estate.”
https://www.cheatsheet.com/entertainment/donald-trump-mar-a-lago.html/
The later purchase of the beachfront may have made it the 20-24 acres.