If you call Disney Reservations, they might be able to tell you which building(s). I had asked where they were and they said they were in Trinidad South but they did not offer what building.
Be aware that Trinidad South is the farthest island from Olde Port Royale. There is an internal bus at the resort but you may be waiting longer than the walk. Aruba and Jamaica are the closest “standard room” islands, a short walk over the bridge. Martinique and Trinidad N. are “preferred” room due to being on either side of OPR.