Architecture Puzzler #321

You are designing an elevator for your new building and, in reviewing the code, you discover that you are required to provide emergency doors if you have a blind hoistway. What is a "blind hoistway"?

The following projects were completed two years apart during the same decade; the Vietnam Veterans Memorial, Washington DC; the AT&T Building, New York; Thorncrown Chapel, Eureka Springs, Arkansas; and the Los Angeles Museum of Contemporary Art. Who is the designer of each, and which in decade were they built? If determining the decade is too easy, try ordering them from oldest to newest.