 It houses around 2,500 office workers (as of 2019).Despite the "One Montgomery" branding, the building's main entrance is on 120 Kearny Street, rather than on Montgomery Street.The building's structural steel columns are covered by a facade consisting of red granite and square tempered glass windows with aluminum frames, with small squares marking the intersections of each block of four windows (except for the first two floors, which use black granite and steel) .