Pan American Union Building

Organization of American States Constitution Avenue National Register of Historic Places
Pan American Union Building
Pan American Building, Washington.jpg
Organization of American States headquarters building, with the Statue of Isabella I in front
Pan American Union Building is located in Central Washington, D.C.
Pan American Union Building
Location17th Street NW between C Street NW and Constitution Avenue, NW.
Washington, D.C.
Coordinates38°53′34″N 77°02′25″W / 38.89288°N 77.04026°W / 38.89288; -77.04026Coordinates: 38°53′34″N 77°02′25″W / 38.89288°N 77.04026°W / 38.89288; -77.04026
ArchitectPaul P. Cret and Albert Kelsey
NRHP reference No.69000298
Added to NRHP4 June 1969

The Pan American Union Building is the headquarters for the Organization of American States. It is located at 17th Street N.W. between C Street N.W. and Constitution Avenue, Northwest, Washington, D.C.[1]


On the former site of the John Peter Van Ness Mansion. The cornerstone was laid on May 11, 1908, by Theodore Roosevelt, Elihu Root, and Andrew Carnegie,[2] and the building was dedicated on April 26, 1910.[3]

In 1919, the initial meeting of the International Labour Organization was held in the building.[4]

In 1969, the building was added to the National Register of Historic Places.


  1. ^ Pan American Union Building at archINFORM
  2. ^ "Hall of Americas for Arms Meeting" (PDF). The New York Times. August 27, 1921.
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