That was the result of the overturning of an eminent domain action against the land’s former owners by the Mexican high court. The new owners, who had leased to the Americans, had to hand the land back to the original owners. The American lessees gambled that the eminent domain action would stand. Unfortunately, they lost their bets:
https://www.nytimes.com/2000/11/01/world/americans-find-their-beachfront-dreams-washed-out-in-mexico.html
http://articles.latimes.com/2000/oct/25/business/fi-41581
Thanks for the clarification but I don’t think it’s as simple as their written law says it is. I could never trust any Hispanic government to keep their word nor could I live under their laws which are largely ignored anyway but I guess that last part is a different conversation altogether.