91 First Avenue Building Date : 1865-1866 Original Use : Residential Original Owner : Heirs of Stephen Whitney Original Architect : Unknown Description & Building Alterations This five-story with basement tenement was built in 1865-66 by the heirs of Stephen Whitney, who purchased many properties on this block in 1825. The facade features a bracketed cornice with frieze, arched window lintels, bracketed sills and a cornice above the first story. The entrance is on the first floor.