Clifford and Kathryn Hach Building, located at 1155 16th Street , N.W. , in downtown Washington, D.C. Built in 1959 (remodeled in 1995), the ten-story, postmodern high-rise was designed by architectural firm Structural Design Group, Ltd. Date 20 June 2010 ( 2010-06-20 ) Source Own work Author AgnosticPreachersKid Permission ( Reusing