The former Rockefeller Guest House is one of the earliest buildings in New York City to reflect the influence of the Modern movement in architecture. Built without the use of traditional ornament, the striking two-story street facade is articulated with precisely arranged structural elements, including a symmetrical first story consisting of a handsome wood door and flanking polished reddish brown ironspot brick walls laid in Flemish bond, surmounted by a grid of six fixed translucent windows faced with four steel H-sections.