exceptionally well-designed and historically important 19th century american leaded art glass window designed by architect louis h. sullivan and executed by the decorating firm of healy and millet, chicago, il. the strongly geometric stained glass window features a combination of rigid right angles and circles in the form of opaque jewels. the surrounding border consists of large darkened amber panels. the abstract moorish-esque segmented lines are a colorless cathedral glass divided by honey-colored panels and two centrally located square-shaped "chunk" glass jewels. the original lead caming and reinforcing bars are intact. the original wood sash frame was removed long ago. the window was likely located in the auditorium's interior hotel lobby. the art glass color scheme was harmonious with the lobby's painted plaster decorations. the leaded glass window was removed during building renovations in the late 1960's. the auditorium building is considered one of the best-known designs of dankmar adler and louis sullivan. completed in 1889, the building was built at the northwest corner of south michigan avenue and congress street (now congress parkway). ferdinand peck, a chicago businessman, incorporated the chicago auditorium association in december 1886 to develop what he wanted to be the world's largest, grandest, most expensive theater that would rival such institutions as the metropolitan opera house in new york city. the building was to include an office block and a first class hotel. peck persuaded many chicago business tycoons to get onboard with him, including marshall field, edson keith, martin ryerson, and george pullman. the association hired the renowned architectural firm ofdankmar adler and louis sullivan to design the building. at the time, a young frank lloyd wright was employed at the firm as draftsman, and he likely contributed to the design. the auditorium was built for a syndicate of businessmen to house a large civic opera house; to provide an economic base it was decided to wrap the auditorium with a hotel and office block. hence adler & sullivan had to plan a complex multiple-use building. fronting on michigan avenue, overlooking the lake, was the hotel (now roosevelt university) while the offices were placed to the west on wabash avenue. the entrance to the auditorium is on the south side beneath the tall blocky eighteen-story tower. the rest of the building is a uniform ten stories with load-bearing outer walls and an exterior organized in the same way as h.h. richardson's marshall field warehouse. the interior embellishment, however, is wholly sullivan's, and some of the details, because of their continuous curvilinear foliate motifs, are among the nearest equivalents to european art nouveau architecture .the auditorium is a heavy, impressive structure externally, and was more striking in its day when buildings of its scale were less common. when completed, it was the tallest building in the city and largest building in the united states.one of the most innovative features of the building was its massive raft foundation, designed by adler in conjunction with engineer paul mueller. the soil beneath the auditorium consists of soft blue clay to a depth of over 100 feet, which made conventional foundations impossible. adler and mueller designed a floating mat of crisscrossed railroad ties, topped with a double layer of steel rails embedded in concrete, the whole assemblage coated with pitch. the resulting raft distributed the weight of the massive outer walls over a large area. however, the weight of the masonry outer walls in relation to the relatively lightweight interior deformed the raft during the course of a century, and today portions of the building have settled as much as 29 inches. this deflection is clearly visible in the theater lobby, where the mosaic floor takes on a distinct slope as it nears the outer walls. in the center of the building was a 4,300 seat auditorium, originally intended primarily for production of grand opera. in keeping with peck's democratic ideals, the auditorium was designed so that all seats would have good views and acoustics. the original plans had no box seats and when these were added to the plans they did not receive prime locations. housed in the building around the central space were an 1890 addition of 136 offices and a 400-room hotel, whose purpose was to generate much of the revenue to support the opera. while the auditorium building was not intended as a commercial building, peck wanted it to be self-sufficient. revenue from the offices and hotel was meant to allow ticket prices to remain reasonable. in reality, both the hotel and office block became unprofitable within a few years. on october 5, 1887, president grover cleveland laid the cornerstone for the auditorium building. the 1888 republican national convention was held in a partially finished building where benjamin harrison was nominated as a presidential candidate. on december 9, 1889, president benjamin harrison dedicated the building and opera star, adelina patti, sang ‘home sweet home’ to thunderous applause. sullivan and adler had also opened his offices on the 16th and 17th floors of the auditorium tower. the chicago symphony orchestra debuted on october 16, 1891, and made its home in the auditorium theatre until moving to orchestra hall in 1904. the opera company renting the accommodation moved to the civic opera house in 1929, and the auditorium theatre closed during the great depression. in 1941, it was taken over by the city of chicago to be used as a world war ii servicemen's center. by 1946, roosevelt university moved into the auditorium building, but the theater was not restored to its former splendor. in 1952, congress parkway was widened bringing the curb to the southern edge of the building. to make room for a sidewalk, some ground-floor rooms and part of the theater lobby were removed and a sidewalk arcade created. on october 31, 1967, the auditorium theatre reopened and through 1975, the auditorium served as chicago's premier rock venue. it was declared a national historic landmark by the u.s. department of the interior in 1975. the building was equipped with the first central air conditioning system and the theater was the first to be entirely lit by incandescent light bulbs. in 2001, a major restoration of the auditorium theatre was begun to return the theater to its original colors and finishes.