How did Sisko'a dad get the restaurant property?
My guess is that the state, maybe at the level of the city of New Orleans, owns the land and leases it out to business-people for productive use, judging on a case by case basis what best serves the community. A Creole restaurant run by a master chef is a good business to have in New Orleans as it helps preserve the local culture and gives people a good place to eat. And I'm using the term "business," but in a future without money, businesses would not be run for profit, but because they serve a perceived greater good.