 Improvements in technology resulted in the invention of smaller telephone equipment, leading to an increase in available office space at the Barclay–Vesey Building.By the 1990s, some office workers were moving back into the Barclay–Vesey Building.The exteriors and ground-floor lobbies of the Barclay–Vesey Building and two other telecommunications buildings were designated city landmarks by the New York City Landmarks Preservation Commission in 1991.