The White House has a huge built-in staff of cooks, butlers, gardeners, cleaning people and etc. that has nothing to do with who the current occupant might be, as do all royal, presidential and prime minister’s residences around the world. As it has been since we left the caves. The food in the cafeteria is delicious. It’s run by the Navy, if I remember correctly.
“White House staff” and “Personal Staff” is different, then. I agree that the facility should run, regardless of occupants.
I think I remember reading that the Reagans paid something like room-service fees for after-hours meals.