The main building's scale and circular groundscraper design, by Norman Foster,[8] have earned the structure a media nickname “the spaceship".[9][10][11] Located on a suburban site totaling 175 acres (71 hectares), it houses more than 12,000 employees in one central four-story circular building of approximately 2,800,000 square feet (260,000 square meters). Apple co-founder Steve Jobs wanted the campus to look less like an office park and more like a nature refuge. Eighty percent of the site consists of green space planted with drought-resistant trees and plants indigenous to the Cupertino area, and the center courtyard of the main building features an artificial pond.[11]