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State-owned land cannot be "taken" by the federal government. The state legislature would need to give the federales permission to purchase it.

Check your Constitution:

"To exercise exclusive Legislation in all Cases whatsoever, over such District (not exceeding ten Miles square) as may, by Cession of particular States, and the Acceptance of Congress, become the Seat of the Government of the United States, and to exercise like Authority over all Places purchased by the Consent of the Legislature of the State in which the Same shall be, for the Erection of Forts, Magazines, Arsenals, dock-Yards, and other needful Buildings;--And"

Presumably the federales could purhase other land WITHOUT the consent of the legislature, but then they would not exercise "like Authority"!

Bet there's a lot of that been going on ~ anyone ever notice that?

Most of the big disputes have involved land already owned by the US government that changes "use" ~ e.g. BLM land transferred to a National Park, and so on. The Interstate Highway system involved, for the most part, states purchasing land from private buyers ~ although the source of the money was ultimately the federal tax system (see: gasoline tax) the states are not constrained in the same manner as the federales in this business of "Authority". Sometimes disputes would arise concerning state use of federal owned land where local interests didn't want the federales to give up the land to the state for a road.