The Mary E. Switzer Memorial Building is a federally owned office building located at 330 C Street SW in Washington, D.C. in the United States. The Egyptian Revival structure was originally named the Railroad Retirement Board Building. It was designed by Charles Klauder and Louis A. Simon and completed on September 15, 1940. Although intended for the Railroad Retirement Board, its first occupant was to the United States Department of War. By Act of Congress, it was renamed the Mary E.