Attached to the white house is a wedding cake of a structure known as the Old Executive Office Building or the Eisenhower Executive Office Building. Built from 1871 till 1888 in the Second Empire French style -it originally held the State, War & Navy Departments. Designed by Richard Ezdorf and Alfred Mullett - this local favorite is built of the expected granite & slate -but also cast iron. Fun fact -there are 900 columns and 1,572 windows on the exterior!