Rockefeller played a dominant role in the design of the Plaza working directly with architect Wallace Harrison. The story goes that Rockefeller was eating his breakfast while they discussed the need for a building that would break up the lines of the planned office blocks. He put his coffee cup on top of his half grapefruit and suggested that the new building take that shape. Initially planned to hold meeting space it soon changed use to become a theater.
The stem of the Egg goes six stories deep into the earth below it. There is a reinforced concrete beam girdle that supports the bulk of the structure. Estimates of the cost to build it range from $90 Million to $100 Million. Inside it contains two performing arts spaces, the 450 seat Lewis A. Swyer Theatre and the 982 seat Kitty Carlisle Heart Theatre.