1030
Opinion of the Court
under relevant property and nuisance principles. The use of these properties for what are now expressly prohibited purposes was always unlawful, and (subject to other constitutional limitations) it was open to the State at any point to make the implication of those background principles of nuisance and property law explicit. See Michelman, Property, Utility, and Fairness, Comments on the Ethical Foundations of "Just Compensation" Law, 80 Harv. L. Rev. 1165, 1239- 1241 (1967). In light of our traditional resort to "existing rules or understandings that stem from an independent source such as state law" to define the range of interests that qualify for protection as "property" under the Fifth and Fourteenth Amendments, Board of Regents of State Colleges v. Roth, 408 U. S. 564, 577 (1972); see, e. g., Ruckelshaus v. Monsanto Co., 467 U. S. 986, 1011-1012 (1984); Hughes v. Washington, 389 U. S. 290, 295 (1967) (Stewart, J., concurring), this recognition that the Takings Clause does not require compensation when an owner is barred from putting land to a use that is proscribed by those "existing rules or understandings" is surely unexceptional. When, however, a regulation that declares "off-limits" all economically productive or beneficial uses of land goes beyond what the relevant background principles would dictate, compensation must be paid to sustain it.17
The "total taking" inquiry we require today will ordinarily entail (as the application of state nuisance law ordinarily entails) analysis of, among other things, the degree of harm to public lands and resources, or adjacent private property,
17 Of course, the State may elect to rescind its regulation and thereby avoid having to pay compensation for a permanent deprivation. See First English Evangelical Lutheran Church, 482 U. S., at 321. But "where the [regulation has] already worked a taking of all use of property, no subsequent action by the government can relieve it of the duty to provide compensation for the period during which the taking was effective." Ibid.
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