 The commission called for three buildings to mark the northern end of the Capitol complex.While the first two buildings in the plan, Union Station and the Postal Square Building, were completed early in the 20th century, the 1901 plan would not be fully implemented until the completion of the Thurgood Marshall Federal Judiciary Building in 1992.A major renovation from 1929 to 1935 expanded the building for increased mail processing and service capacity.