You have a point that land is a scarce and excludable good and there's an opportunity cost to a corporation owning land. The initial purchase of the land by th

You have a point that land is a scarce and excludable good and there's an opportunity cost to a corporation owning land. The initial purchase of the land by the corporation wasn't zero sum, however. The previous landowner and the corporation both gained subjective utility from the transaction (otherwise they wouldn't have engaged in it), so the transaction itself was positive sum.