Trump leases his Washington DC hotel space from the US Postal Service. Part of that contract (and indeed, any contract with federal leases) includes the stipulation that no elected officials may be involved in the lease.
Government Executive reports:
The Post Office Lease differs from many of Mr. Trump’s other business arrangements. That’s because, in writing the contract, the federal and D.C. governments determined, in advance, that elected officials could play no role in this lease arrangement. The contract language is clear: “No ... elected official of the Government of the United States ... shall be admitted to any share or part of this Lease, or to any benefit that may arise therefrom...”
The language could not be any more specific or clear. Donald Trump will breach the contract on Jan. 20, when, while continuing to benefit from the lease, he will become an “elected official of the Government of the United States.”
Maybe the GSA needs to revoke his lease. Oh, but wait, when he steps into office, he'll be the one employing them. This is a massive conflict of interest. It's time we start doing something about this. Trump cannot be allowed to hold public office while this kind of issue persists.