The report used calculations by the Mac Observer’s John Martellaro, who painstakingly estimated the size of Apple’s plot and the proposed building from its architectural plans with a ruler and good, old-fashioned mathematics. He estimated that the headquarters building would have a radius of 807.5 feet.
According to Elmer-DeWitt, however, Martellaro’s calculations about the building’s radius weren’t quite right. The floor plan submitted by Apple to the City of Cupertino lists a 760-foot, 7-inch outer radius for the headquarters, making it slightly smaller than the famous five-sided hub of the Defense Department. (If the Pentagon was enclosed within a circle, the radius would come out to about 783 feet.)
The Apple building is designed with 1.8 million square feet of office space for 13,000 employees — and would certainly be one-of-a-kind, even if it couldn’t encircle the Pentagon.