The Excelsior Steam Power Company Building is a monumental reminder of New York’s key role in the development of electric lighting and power systems in the United States. It is the oldest-known purpose-built commercial generating station standing in Manhattan, and one of the few major structures remaining from Manhattan’s pioneering era for electric lighting and power. The building is a handsome example of the muscular industrial architecture of the 1880s. it is Romanesque Revival in style, with a five-part main facade with projecting end and tower pavilions and a high base decorated with foliated terra-cotta plaques and a metal sign identifying the building in elegant period lettering.