Citi operates and maintains Data Center space in (3) floors 6, 7 and 8 at the 390 Greenwich street facility. This paper focuses on the 7th and 8th floors. The 8th floor data center comprises approximately 15,000 sq ft (1,500m2) with a power consumption of 500kW, and the 7th floor data center approximately 41,000 sq ft and a power consumption of 1,980kW. The major consumers of energy are the IT equipment, Electrical distribution gear and Cooling equipment. This paper details a study to evaluate the existing conditions of these spaces, and proposals to change to the IT layout, and cooling configuration.