<P> The building is currently being renovated under a 12 - year plan to modernize the structure . In May 2014, the General Services Administration (GSA) awarded a $25 million contract to build a new public entrance on the east side of the Truman Building . The glass and steel structure will act not only as a high - security entrance to the building but also as a museum about American diplomacy . The 20,000 - square - foot (1,900 m) addition, called the U.S. Diplomacy Center, was designed by the firm Beyer Blinder Belle, and is being constructed by Gilbane Construction . The addition is being privately funded by the Diplomacy Center Foundation, a nonprofit established by former Secretary of State Madeleine Albright in 2000 to honor American diplomats . The National Capital Planning Commission approved the design in 2011 . Construction should be complete in 2016 . GSA awarded a $77.4 million contract in September 2014 to renovate much of the rest of the structure . Some of the renovations will restructure the interior layout of the building to meet the State Department's needs . But most of the contract will focus on replacing the building's electrical, elevator, mechanical, plumbing, and telecommunication systems . The refurbishment will begin in January 2015 and take 14 months to complete . </P> <P> The building was listed on the National Register of Historic Places in 2017 . </P> <P> The original portion of the building, known as the War Department Building, is an example of the Stripped Classical architectural style with Art Moderne elements . The steel - framed building is clad in limestone and rises eight stories above the basement and sub-basement . Because it was designed to be expanded at a later date, it was deliberately asymmetrical . A central spine connects a U-shaped configuration to the east with an E-shaped configuration to the west . </P> <P> The horizontal delineations of the facade reflect the classical precedents of the architectural style . Cornices and pink granite string courses create a base - shaft - capital system . The wings create a series of interior courtyards . The interior courtyard walls are clad in dark granite, emphasizing the transition from base to shaft . </P>

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