Cite as: 535 U. S. 302 (2002)
Opinion of the Court
prohibiting any economic use of land for a 32-month period has the same legal effect. Petitioners seek to bring this case under the rule announced in Lucas by arguing that we can effectively sever a 32-month segment from the remainder of each landowner's fee simple estate, and then ask whether that segment has been taken in its entirety by the moratoria. Of course, defining the property interest taken in terms of the very regulation being challenged is circular. With property so divided, every delay would become a total ban; the moratorium and the normal permit process alike would constitute categorical takings. Petitioners' "conceptual severance" argument is unavailing because it ignores Penn Central's admonition that in regulatory takings cases we must focus on "the parcel as a whole." 438 U. S., at 130- 131. We have consistently rejected such an approach to the "denominator" question. See Keystone, 480 U. S., at 497. See also Concrete Pipe & Products of Cal., Inc. v. Construction Laborers Pension Trust for Southern Cal., 508 U. S. 602, 644 (1993) ("To the extent that any portion of property is taken, that portion is always taken in its entirety; the relevant question, however, is whether the property taken is all, or only a portion of, the parcel in question"). Thus, the District Court erred when it disaggregated petitioners' property into temporal segments corresponding to the regulations at issue and then analyzed whether petitioners were deprived of all economically viable use during each period. 34 F. Supp. 2d, at 1242-1245. The starting point for the court's analysis should have been to ask whether there was a total taking of the entire parcel; if not, then Penn Central was the proper framework.26
An interest in real property is defined by the metes and bounds that describe its geographic dimensions and the
26 The Chief Justice's dissent makes the same mistake by carving out a 6-year interest in the property, rather than considering the parcel as a whole, and treating the regulations covering that segment as analogous to a total taking under Lucas, post, at 351.
331
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