Mepụta ụdị okwu a dị mgbagwoju anya Ụlọ ọrụ National Trust for Historic Preservation etinyela ụlọ nkwari akụ a na mmemme ụlọ nkwari akụ akụkọ ihe mere eme nke America.
N'ezie, ụdị nkebi ahịrịokwu ahụ dị mgbagwoju anya bụ "National Trust for Historic Preservation etinyela ụlọ nkwari akụ ahụ na mmemme Historic Hotels of America ya na American Society of Civil Engineers họpụtara ụlọ nkwari akụ ahụ dị ka National Historic Civil Engineering Landmark. "