 From 1927 until 1937, Bennett served as Chairman of the Board of Architects responsible for the development of the Federal Triangle in Washington, DC, a large complex of government buildings between the White House and the United States Capitol built to house a number of Federal agencies, including what is now the National Archives and Records Administration.Although most of his life's work reflected the Beaux Arts tradition, Bennett also designed two known modernist structures, one a personal studio on the south grounds of the Bagatelle estate, and the other a house in the artist colony of Tryon, North Carolina.After the retirement and death of his partners, Bennett closed his practice in 1944 and spent the final decade of his life in retirement.