Are you searching for Caraways mansion? If so, he is on the other side of the road. Go as much as you can that way on the opposite of where you are, and then talk. Some guy will then talk to you and tell you to go to the Tomb of the Unknown King to get the I.D.

EDIT: The ID always changes; there is not a fixed one. You can get the I.D. from the Tomb of the Unknown King, which is behind Deling City. The I.D. is right on the second screen of the Tomb of The Unknown King, on a Gunblade.