The old Hospitality Center / Terrace no longer serve any type of sandwiches, the only thing offered is the buffet. Also, due to the limitations of a buffet, you need to make a purchase before you can even get into the building or onto the patio portion, so the little bar in the front is no longer an option unless you are eating pizza. The only slight exception to this is the bathrooms on the side closest to the old Clydesdale barn. You can still access them from the side door.
As of right now, I have not noticed that any of the sandwiches have migrated to other places. So if you had a favorite one, don't get your hopes up that you can find it unless it was already served somewhere else.