They seized our property decades ago, every heard of Zoning?
Different can of worms - eminent domain has always been written into the constitution. Government has ultimate right of land so long as they can show just cause and pay fair use for it. Kind of odd if you think of it as a conflict with the 4th amendment but also a necessary bureaucratic evil for things like military bases, government buildings, etc)
And, as always, ripe for abuse.