 It houses offices of the Consumer Product Safety Commission, Army Corps of Engineers, Defense Contract Management Agency, Federal Bureau of Investigation, United States Department of Housing and Urban Development(HUD), Internal Revenue Service, Peace Corps, Railroad Retirement Board, Veteran Affairs (VA), The American Legion Department of Michigan and Social Security Administration.It is named for Patrick V. McNamara, a Democratic United States Senator from the State of Michigan from 1955 to 1966.The tower contains approximately on 27 floors and is in the brutalist architectural style.