Lever House, ca. 1952.

Designed by the huge international firm, Skidmore, Owings & Merrill, Lever House ushered in the age of the "glass box" skyscraper (pioneered by the architects at SOM). Completed in 1952, the green-tinted glass curtain wall and elevated horizontal plaza at the base (set off the ground by columns) epitomize the International Style.

At only 24 stories, Lever House is smaller than both most nearby skyscrapers as well as the large glass box commercial buildings designed by SOM since 1952. In an unusual occurrence (especially in comparison to the current real estate market), the building, instead of occupying its full zoning allowance, uses only 25 percent of the available zoning and provides open public space on part of the lot.