text: Federal Triangle is a triangular area in Washington, D.C. formed by 15th Street NW, Constitution Avenue NW, Pennsylvania Avenue NW, and E Street NW. Federal Triangle is occupied by 10 large city and federal office buildings, all of which are part of the Pennsylvania Avenue National Historic Site. Seven of the buildings in Federal Triangle were built by the U.S. federal government in the early and mid-1930s as part of a coordinated construction plan that has been called "one of the greatest building projects ever undertaken" and all seven buildings are now designated as architecturally historic.
  Federal Triangle station is the Washington Metro station serving Federal Triangle and its immediately surrounding areas.
  Name
  The name "Federal Triangle" appears to have been a journalistic invention.  The press wrote of a "Pennsylvania Avenue Triangle" as early as November 18, 1926, and use of this name continued as late as June 1929, but by 1927, it was more common for the news media to refer to the area as "the Triangle". This name was in use by 1928, even by government officials, and still used as of late 1934.
  The Associated Press first used the term "Federal Triangle" (with both words capitalized) in 1935. The New York Times first used the term in 1936, although the paper's capitalization of both words did not become standardized until 1939. Definitions of the area also varied at first.  Early news reports believed the eastern apex of Federal Triangle extended as far east and south as the Ulysses S. Grant Memorial in front of the United States Capitol. But almost all reports referred to Pennsylvania Avenue NW and 15th Street NW as the Triangle's northern and western boundaries.
  Genesis and design