The Old Patent Office Building in Washington, D.C., now houses the National Portrait Gallery. The article names no original architect or client. It says the building was constructed between 1836 and 1867, and Congress transferred it to the Smithsonian in 1958. The porticoes are modeled on the Parthenon, and the facade is sandstone and marble. The article gives no style label or dimensions.
The building served as a Civil War hospital. It was renovated for the museum and opened in 1968. The text says the renovation was complete by April 1968 in one place and 1969 in another. Hartman-Cox oversaw conservation work, and Norman Foster designed the glass canopy of the Kogod Courtyard.
It closed in 2000 for a renovation that cost 283 million dollars against an estimate of 42 million, and it reopened on July 1, 2006. It is a National Historic Landmark. The article gives no hours.

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