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Opinion of the Court
making certain uses of her private property.17 Our jurisprudence involving condemnations and physical takings is as old as the Republic and, for the most part, involves the straightforward application of per se rules. Our regulatory takings jurisprudence, in contrast, is of more recent vintage and is characterized by "essentially ad hoc, factual inquiries," Penn Central, 438 U. S., at 124, designed to allow "careful examination and weighing of all the relevant circumstances." Palazzolo, 533 U. S., at 636 (O'Connor, J., concurring).
When the government physically takes possession of an interest in property for some public purpose, it has a categorical duty to compensate the former owner, United States v. Pewee Coal Co., 341 U. S. 114, 115 (1951), regardless of whether the interest that is taken constitutes an entire parcel or merely a part thereof. Thus, compensation is mandated when a leasehold is taken and the government occupies the property for its own purposes, even though that use is temporary. United States v. General Motors Corp., 323 U. S. 373 (1945); United States v. Petty Motor Co., 327 U. S. 372 (1946). Similarly, when the government appropriates part of a rooftop in order to provide cable TV access for apartment tenants, Loretto v. Teleprompter Manhattan CATV Corp., 458 U. S. 419 (1982); or when its planes use private airspace to approach a government airport, United States v. Causby, 328 U. S. 256 (1946), it is required to pay for that share no matter how small. But a government regulation that merely prohibits landlords from evicting
17 In determining whether government action affecting property is an unconstitutional deprivation of ownership rights under the Just Compensation Clause, a court must interpret the word "taken." When the government condemns or physically appropriates the property, the fact of a taking is typically obvious and undisputed. When, however, the owner contends a taking has occurred because a law or regulation imposes restrictions so severe that they are tantamount to a condemnation or appropriation, the predicate of a taking is not self-evident, and the analysis is more complex.
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