There’s a bit of Inception-level dream-within-a-dream stuff in the U.S. Court of Appeals for the Third Circuit’s opinion in Tennessee Gas Pipeline Co. LLC v. Permanent Easement for 7.053 Acres, No. 17-3700 (July 23, 2019), because the court held in takings by a private condemnor exercising the delegated power of eminent domain under the federal Natural Gas Act, the governing rules about just compensation are provided by federal common law. But “[b]ecause federal law does not supply a rule of decision on this precise issue, we must fill the void with a common law remedy. In doing so, we opt to incorporate state law as the federal standard.” Slip op. at 3.
So the applicable federal common law of just compensation incorporates state law. Got it.
Here, the fight was over “consequential damages” which the property owner incurred as a result of the pipeline taking, such as professional fees

