West Rotunda, restored in 1987. Extensive research was conducted to determine the colors of the stained glass that disappeared during the 1950s. (Walter Smalling, Jr.)

The remaining north, west, and center wings were constructed for the War Department and took an additional 10 years to build. Notable interiors include an ornate cast-iron library, the Secretary's suite, and the stained glass skylight over the west wing's double staircase.

The Executive Office of the President Law Library was originally the War Department Library. This room mixes motifs derived from several architectural styles and, although it looks like a mixture of different metals, is composed entirely of cast iron. (Walter Smalling, Jr.)