Art I, Sec 8, Cl 17 gives the feds the right to own certain places within states like “Forts, dock-Yards”, and “other needful buildings” if “purchased by the Consent of the Legislature of the State.”
If there are no constitutional grounds for the feds owning the land or the building, then HASTA LA VISTA, BABY!
Exactly. Facilities and needed land used by the feds to be returned once not used, not, “We’re taking your entire State”.