Whether a regulation that grants third parties a right to enter private property is analyzed as a per se physical taking or as an ordinary use restriction under Penn Central.
Holding
A regulation that physically appropriates private property for the government or a third party is a per se physical taking, even when the appropriation is accomplished through a regulation rather than formal eminent domain.
Reasoning
The Takings Clause requires just compensation when government physically takes private property for public use. The Court distinguishes that categorical rule from the more flexible Penn Central framework, which generally governs restrictions on an owner’s own use of property, such as zoning or limits on selling particular goods.
The form of government action does not control. A statute, ordinance, or administrative regulation can create a physical taking if it appropriates property for the government or another person. In that circumstance, Penn Central does not apply because the government must pay for what it has physically taken.
The central question is therefore whether California merely regulated how the growers used their land or instead appropriated one of their property rights for union organizers. The Court held that the latter characterization governs.