Pan American Union Building

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Pan American Union Building
Pan American Building, Washington.jpg
Organization of American States headquarters building
Pan American Union Building is located in Central Washington, D.C.
Pan American Union Building
Location 17th Street NW between C Street NW and Constitution Avenue, NW.
Washington, D.C.
Coordinates 38°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
Built 1908–1910
Architect Paul P. Cret and Albert Kelsey
NRHP reference # 69000298
Added to NRHP 4 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] and in 1921, the Washington Naval Conference was held there.

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


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