Detail of mantelpiece from the former office of the Secretary of State. (White House)

Completed in 1875, the State Department's south wing was the first to be occupied, with its elegant four-story library, Diplomatic Reception Room, and Secretary's office decorated with carved wood, Oriental rugs, and stenciled wall patterns

The Executive Office of the President Library was originally the State Department's Library. this room was constructed entirely of cast iron in 1875. (Walter Smalling, Jr.)