substantial difference as part of a good building." The roof includes mechanical equipment, as well as microwave and satellite communications machinery. In January 2012, Deutsche Bank installed a 122.4 kW solar photovoltaic (PV) system on the roof of to decrease carbon emissions by 100 metric tons per year. The system is the largest solar PV array in Manhattan. Features 60 Wall Street is designed with of leasable space. Before 60 Wall Street was developed, the site was zoned to only allow a building of "as of right", assuming a floor area ratio of 15. For the building's construction, Park Tower Realty purchased over of neighboring 55 Wall Street's air rights from Citibank. The project also received a bonus of for a covered pedestrian space and for public arcades on Wall and Pine Streets. 60 Wall Street also received allotment of for mechanical spaces. This brought the gross floor area to about . As part of the Leadership in Energy and Environmental Design (LEED) program, the tower has design features that are intended to meet green building standards, which allowed it to receive a LEED Gold certification. Atrium The ground floor contains an enclosed public atrium that measures high and long. The atrium was included in exchange for more interior area on upper stories. The landscaped space is designed with seasonal plantings. When the building was designed, Roche had rejected the idea of an open-air atrium, both because he felt it would disrupt Wall Street's "street wall" of stone facades and because he believed it to be too close to the nearby plaza at Chase Manhattan Plaza. A similar atrium had been planned in 1969 for an unbuilt skyscraper that would have housed the Federal Reserve Bank of New York. The atrium is decorated largely in white materials, including marble tiles shaped like bricks. The space is divided by ten white octagonal columns topped by flared capitals, which support a latticed ceiling originally decorated with wood and mirrors. Roche had previously used this motif at the United Nations Plaza Hotel. The bases of each column have ledges for seating, and movable chairs and tables are placed throughout the rest of the space. A pedestrian passage runs through the center of the atrium. The western wall of the space has stone sculptures with water spouts and planters below. The eastern wall has storefronts, with restrooms and the office entrance near the northeast