Loretto v. Teleprompter Manhattan CATV Corp.
Loretto v. Teleprompter Manhattan CATV Corp., 458 U.S. 419 (1982), was a case in which the Supreme Court of the United States held that when the character of the governmental action is a permanent physical occupation of property, the government actions effects regulatory taking to the extent of the occupation, without regard to whether the action achieves an important public benefit or has only minimal economic impact on the owner.
Source: Wikipedia — Loretto v. Teleprompter Manhattan CATV Corp. (CC BY-SA 4.0)