That is EXACTLY what Mulvaney said at the presser. It will be at cost - no profit - and will be 50% less than the other locations they looked at. Plus its a better setup than any other location.
Trump has said from his election that he will keep zero profits from any of his venues whenever foreign government people stay at them. I think that he is donating them to the US Treasury. You can be sure that he has been doing this already since inauguration or the media would have already been all over it.
I would love for him to bring out some charts to demonstrate how much he has put into the Treasury already.
2017; https://www.fiscal.treasury.gov/files/foia/donation-from-the-trump-organization-redacted.pdf
It was 200K in 2018