All of these elements are found in Sullivan's widely admired Guaranty Building, which he designed while partnered with Adler. Completed in 1895, this office building in Buffalo, New York is in the Palazzo style, visibly divided into three "zones" of design: a plain, wide-windowed base for the ground-level shops; the main office block, with vertical ribbons of masonry rising unimpeded across nine upper floors to emphasize the building's height; and an ornamented cornice perforated by round windows at the roof level, where the building's mechanical units (such as the elevator motors) were housed. The cornice is covered by Sullivan's trademark Art Nouveau vines and each ground-floor entrance is topped by a semi-circular arch.