Pan American Union Building
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Organization of American States headquarters building
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Location | 17th Street NW between C Street NW and Constitution Avenue, NW. Washington, D.C. |
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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. 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, and the building was dedicated on April 26, 1910.
In 1919, the initial meeting of the International Labour Organization was held in the building, and in 1921, the Washington Naval Conference was held there.
In 1969, the building was added to the National Register of Historic Places.