I hope you are being facetious, because I cannot find the clause:
Congress shall have the power to dispose of and make all needful Rules and Regulations respecting the Territory or other Property belonging to the United States in my copy of the Constitution.
Will you please provide Article and Section reference?
Article IV, Section 3.
BTW, what you posted up is the Enclave Clause, which applies only to land transferred from a state to the feds and has no bearing on these lands that were always owned by the fed and never belonged to a state govt.