early 20th century all original and unrestored american exterior ornamental cast iron building facade corbel salvaged from the extant 14-story chicago and northwestern railroad prairie school office building designed by the architectural firm of frost and granger in 1904. the partnership, consisting of charles sumner frost (1856–1931) and alfred hoyt granger, were known for their designs of train stations and terminals, including the now-demolished chicago and north western terminal in chicago. the oversized neoclassical style cast iron corbel contains richly ornamented floral rosettes, extensive acanthus leafage and volutes. the layers of old black paint finish have been thoroughly removed in order to achieve a better visual appreciation of the fine casting detail. attributed to the dearborn foundry company, chicago, il. 8 1/2 inches x 5 1/2 inches x 24 inches.