The Court denied the petitioners' argument that their support estate had been taken. It analogized the support estate in this case to the "air rights" above Grand Central Station in "Penn Central Transportation Co. v. New York City" (1978) and found that it was not "a separate segment of property for Takings Clause purposes." Declining to allow state law definitions of property interests to govern its takings analysis, the Court viewed Pennsylvania's three estates in land as one combined property interest.