Between 1930 and 1931, the Courthouse was expanded with the construction of a two-story annex at the western end of the building. The annex was designed by architect Harold E. Burkett and built at a cost of approximately $450,000. The annex was designed to mirror the architecture of the main courthouse with a terra cotta facade, copper roof, and bronze door. It provided space for a jail and offices for, among others, the sheriff's department, motor patrol, county board of education, farm bureau, and health department.