Some improvements were made to Federal Triangle , however . In 1952 , the Andrew W. Mellon Memorial Fountain was dedicated within the eastern tip of the Triangle . A new cooling plant was built in 1960 . Beginning in 1970 , all the buildings were floodlit at night in order to reduce the level of crime in the area . In 1972 , the Federal Triangle Washington Metro station was approved at Federal Triangle , and the station on Metro 's Blue and Orange lines opened on July 1 , 1977 . Major heating , cooling , and electrical upgrades were made to the Archives , ICC , and Labor buildings and the Departmental Auditorium in 1984 . After the terrorist bombing of the Alfred P. Murrah Federal Building in Oklahoma City on April 19 , 1995 ( which killed 168 people ) , security at Federal Triangle was tightened measurably and many of the pedestrian areas and buildings restricted to federal employees or those with official business . A major renovation for the Labor , ICC , and Post Office buildings was conducted in 1998
terrorist bombing
Oklahoma City bombing
Federal Triangle