Yeah. Of course the actual law would be several hundred pages long and reference large volumes of existing work. Like any law. And the degree to which you belie

Yeah. Of course the actual law would be several hundred pages long and reference large volumes of existing work. Like any law. And the degree to which you believe the letter and spirit of the law are each used to counter-act each other is a separate discussion. But, to answer your flippant questions: Legally possess. Land and buildings. Physical and temporal occupation of space and time on the "property" above some reasonable threshold.