Office of Vocational Rehabilitation in the Department of Health, Education, and Welfare in 1950 and the first administrator of HEW's Social and Rehabilitation Service in 1967. She retired in 1970 as the highest ranking female bureaucrat in the federal government. In December 1971, Senator Hubert H. Humphrey (D-Minnesota) introduced legislation in the Senate to have the Railroad Retirement Board Building renamed in honor of Switzer. On October 21, 1972, President Richard Nixon signed Public Law 92-520 into law. Section 26 of the law redesignated the Railroad Retirement Board Building as the "Mary Switzer Memorial Building". The structure was formally rededicated on January 16, 1973. It was the first federal building to be named for a woman. On July 6, 2007, the Switzer Building was added to the National Register of Historic Places. Renovations By 2002, three agencies occupied space in the Switzer Building. The United States Department of Education took up 60 percent of its space, while the United States Department of Health and Human Services had 30 percent and the Broadcasting Board of Governors (the body which governs the Voice of America and other U.S. government broadcasting bodies) had the remainder. In 2002, the General Services Administration announced an $81.7 million renovation of the Switzer Building. HNTB, an architectural and engineering firm, was selected to oversee the upgrades. Construction was scheduled to begin in early 2005, and proceed in two phases. Phase I would renovate half the building and end in early 2007. Phase II would renovate the other half, and be complete in summer 2008. Renovations included an entirely new HVAC system, fire suppression system, and emergency electrical power plant; replacement of all electrical wiring and plumbing; a new telecommunications system; security upgrades; and refurbishment of the main lobby. Because modern mechanical and HVAC equipment was much smaller than the units it replaced, the two-story mechanical penthouse was reclaimed and converted into office space. Phase II of the project began in July 2009. Another of mechanical space was reclaimed in the sixth and seventh floors (the former two-story mechanical penthouse), the elevator shafts extended to the two topmost stories, and new elevators installed. Windows throughout the building were replaced with modern energy-efficient ones, and a green roof placed atop the structure. While construction continued, the Switzer Building served as the headquarters for the second inauguration of George W. Bush. In April 2014, the General Services Administration said it