East and West wings were added from 1909 to 1912 and faced in granite which required a special session of the legislature to make the selection. Refacing of the copper dome was done in 1934. Air conditioning and the large granite stairway were added in the late 1940s. In 1962, the Legislature authorized extension seismic work and modernization which resulted in a virtually new interior with same external shell. Legislature enacts provision for Capitol Restoration Commission.
Legislatures authorize funding for upgrade, preservation and historical restoration.