There is land throughout the west that encircles (or otherwise makes it difficult to access) public land that it borders that goes for obscene amounts of money

There is land throughout the west that encircles (or otherwise makes it difficult to access) public land that it borders that goes for obscene amounts of money for the very reason that it, defacto, has exclusive access to this land. This landowner purchased this land for that reason, and it was almost certainly marketed that way by the real estate listing.