I meant to address that when I wrote about property rights: Only the wealthy can afford what you describe; that system effectively restricts such expression to

I meant to address that when I wrote about property rights: Only the wealthy can afford what you describe; that system effectively restricts such expression to them. Also, if I pay you to advertise on your building, that's only two of us deciding: from the public's point of view, it's no better than unilateral. (Or you could put your own advertisement, such as your business name, on your building.)