I agree it will most likely be built in Florida. I think Miami on part of his Doral property. People can come to visit and stay the weekend at Doral. Would be great for his business.
If he gets a second term things could change. If he doesn’t, I would expect his library will be finished before Obama’s.
(When I was young I often walked over to that park to have lunch... on the far end of where Obama's Library grounds end is a block from where Saul Alinsky had his TWO office on Stoney Island in the early 60's...)