Land Ownership Question

Hey everyone. I came across an interesting Air B and B last night at the link below and I was wondering what would be involved in terms of land ownership and permission? Would you have to own the land you build this on or how does that work?

There’s nothing there that has a foundation – everything is portable/removeable. If you were able to rent such land, and the owner were amenable, you could do that if you have the owner’s consent in writing and it is legal in that place…