In 1868, the city passed an ordinance forbidding frame construction on the Square. The New Brush Building at 100 South Illinois Avenue was built in 1895 to replace the city's first commercial structure, a wood frame general store built in 1852 by Carbondale founder Daniel Brush. Its owner, Harriet Rupp Brush, daughter-in-law of Daniel Brush, retained her father, Isaac Rapp, to design and build the new building with principal facades on both Main Street and Illinois Avenue. The adjoining building at 106 South Illinois Avenue, completed by 1882, is an L-shaped building with a prominent three-story facade on Illinois Avenue and a two-story facade on Main Street. In 1856, James Morgan built a three-story brick building at 100 North Illinois Avenue. After a remodeling in 1906, the Morgan Store was later replaced in 1928 when the Carbondale National Bank constructed the existing building, which has a smooth limestone surface and sleek styling reminiscent of the Midwestern Art Deco architectural style fashionable in the 1920s and 1930s.