This Article identifies property law’s special protection for existing uses, explores possible justifications for this protection, and argues that none can support the strong protection that existing uses currently enjoy. Various land use doctrines— from zoning to the vested rights doctrine to amortization rules for prior nonconforming uses—assume that the government cannot eliminate existing uses without paying compensation. The Article asks whether this result is compelled either by constitutional rules or by normative considerations. Neither the Takings Clause nor the Due Process Clause requires this level of protection for existing uses. Normatively, many obvious-seeming justifications dissolve on closer inspection. Objections grounded in underlying principles of fairness and reliance are not conceptually different for regulations prohibiting future uses than for regulations of existing uses. Nor is the extent of economic loss necessarily greater for one than for the other, even though regulations of existing uses create out-of-pocket costs whereas regulations of future uses only implicate forgone profits. In fact, none of the possible explanations for the special treatment of existing uses actually justifies their protection. This Article ultimately concludes that existing uses should not be entitled to any special judicial protection but instead should be subject to the same takings and due process analyses that apply to all regulation and governmental action.