1922 photo of Old Capitol dome before gold leaf application. The dome was covered with copper and had electric lights along the ribbing.

Between 1921 and 1924, Old Capitol underwent a major structural renovation. The oak supporting beams were replaced with steel beams, one riser was added to the spiral staircase, and the southwest corner of the building's foundation was repaired.

The 650-pound crystal and brass chandelier that graces the Senate Chamber was installed, and more than 6,400 three-inch square pieces of gold leaf were applied to gild Old Capitol's dome. The west portico, in the original plan but never built, was added in the 1921-24 renovation, and Old Capitol was at last complete.