The southern annex, completed in 1965, has fewer setbacks. On the New Street side, there are setbacks above the 5th and 10th floors; the building then rises as a slender slab with setbacks on the 29th, 34th, and 35th floors. Along Broadway, the facade of the annex was originally recessed behind that of the original building, by a width of two vertical bays. In 2018, an entrance to the retail space was constructed in front of the annex, ranging between one and seven stories high. The facade of the 2018 addition projects forward to the facade of the original structure. Five stories were also built atop the initial portion of the annex. In total, according to zoning documents, the annex measures on Broadway and on Exchange Place.