Next door to the White House is the Eisenhower Executive Office Building (EEOB). This spot is a large part of our national history and architectural heritage. Designed by Supervising Architect of the Treasury, Alfred B. Mullett, it was built from 1871 to 1888 to house the growing staffs of the State, War, and Navy Departments, and is considered one of the best examples of French Second Empire architecture in the country.
We were lucky to get a private tour here. The White House Military Office provided us an informative experience. 
The floors have fossils in them.
There are gorgeous libraries located here.
Prominent Features: mansard roof with cast-iron trim; stained glass skylights; monumental spiral staircases; three cast-iron libraries of two-, three-, and four-stories.
The interior has ceilings eighteen feet high, and nearly two miles of corridors, lined with floors of white marble and black limestone. 
In 1982 the Preservation Office was established to develop a comprehensive preservation program for the building. 
kettersinkorea 
So gorgeous! Thank you so much for sharing those pictures. I’ve always wondered what that building looks like on the inside – and that library was incredible.
Something many will never experience. Thank you for sharing.
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I have more pictures and info to share with you!