I think Congress can refuse the funding to close the place down. And what about all the American-owned assets that Fidel “nationalized?”
I lived in a house in Havana, First Avenue and 30th Street for four years (93-97). It was a 4BR, 4BA, corner lot, 100 yds from the Gulf of Mexico. The Cuban government took it over from a successful Cuban who fled to Miami during the revolution. They’d been leasing it to foreigners for big bucks ever since. For the time I was there, the USG was paying the Cuban government $3000 per month - all gravy for them. I really loved that house.