Update: the latest in the latest Williamson County-related cert petition here.
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If you tried to explain the practical results of Williamson County‘s ripeness requirements to someone not familiar in the last 30 years of regulatory takings jurisprudence, they would probably think you were joking.
As we’ve explained many times, under Williamson County, a property owner alleging a violation of her express federal constitutional right prohibiting takings without just compensation cannot bring that federal constitutional claim in a federal court. Instead, she is first required to present her state claim for compensation to a state court before she can even think of a federal action. And if she loses in state court, she will be deemed to have also litigated the federal claim, even if she expressly did not. Williamson County‘s rationale was that there is no violation of the Fifth Amendment by a state