“The Air and Space Museum, designed by Hellmuth Obata and Kassabaum Architects (HOK), is marked by its four marble-clad pavilions, separated by three recessed steel-and-glass atria. Construction started in 1972 and continued until the museum opened on July 1, 1976. It has undergone basic repairs since, but the systems and materials are running on borrowed time in part because certain building components were “downgraded” as part of the original construction to reduce cost and hit the stunningly low $40 million budget.”