What are the actual marginal costs the gov't incurs to "own" this land per year?
Why is it not subject to local Property (wealth) taxes?
How is it beneficial to the Gov't to own this land? How is it beneficial to the people of Clark County for the Feds to own this land?
Once that happens, Congress can pass any law as to the use of that land and have EXCLUSIVE control over that parcel. No justification is required.