A "plat" of land is not tangible property. It is real property, not personal property. Real property, or the ownership of land, is a legal concept. That's why they have deeds to real property. A dead is tangible. Real estate is not tangible - the real estate is merely described on the piece of paper called a deed in terms of metes and bonds. If there is a huge flood, or a giant earthquake, the "land" described on a deed can disappear and simply not exist anymore. You should try to grasp basic legal concepts before attempting to explain them to other people.