exceptionally well designed and historically important museum quality 19th century copper-plated ornamental cast iron interior chicago stock exchange elevator frieze or header panel fragment designed by chicago architect louis h. sullivan. the finely cast building fragment was executed by the winslow brothers of chicago. the original copper-plated finish is largely intact with a nicely aged surface patina. the frieze panel features an impressive interplay between intricate organic foliage and strongly geometric shapes. the museum quality piece was decommissioned several years ago by the chicago art institute. the chicago stock exchange building was built between 1893-94 and demolished, beginning in 1972. the downtown chicago financial district building had 13 stories and a single basement carried on pile and/or cassion foundations. the building had 480 offices and was adler and sullivan's largest commission after the auditorium.