 Studio Architetti Valle, along with Fred Liebmann and Jeremy P. Lang Architects, designed an 11-story annex in 1982.The annex, located south of the original building contains black granite and limestone cladding, as well as a turret at the southern corner, which complements the other turret at the entrance of the original building.The annex features double doors facing South William Street, as well as a service entrance at Stone Street.