This professional service firm's new office space required an interconnecting stair across four stories in a high rise building. A new slab opening was cut and limited in size to precisely fit the new stair and to mitigate the cost of reinforcing the slab, as well as to maximize the usable floor area. The architectural stair was designed with a single run connecting each story without an intermediate landing. The architecture of the stair was designed as a thin folding plate with one central stringer. The stair was combined with a multi-story feature wall of perforated millwork panels.