Pan American Union Building

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Pan American Union Building
Pan American Building, Washington.jpg
Organization of American States headquarters building
Location 17th Street NW between C Street NW and Constitution Avenue, NW.
Washington, D.C.
Built 1908-10
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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