The AIA is headquartered at 1735 New York Avenue, NW in Washington, D.C. A design competition was held in the mid-1960s to select an architect for a new AIA headquarters in Washington. Mitchell/Giurgola won the design competition but failed to get approval of the design concept from the United States Commission of Fine Arts. The firm resigned the commission and helped select The Architects Collaborative (TAC) to redesign the building. The design, led by TAC principals Norman Fletcher and Howard Elkus, was ultimately approved in 1970 and completed in 1973. In honor of the 150th anniversary of the organization, the building was formally renamed in 2007 the "American Center for Architecture" and is also home to the American Institute of Architecture Students, the Association of Collegiate Schools of Architecture and the National Architectural Accrediting Board.