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To avoid any disruption to the chilled water service, the new plant was constructed during the winter months (1999/2000) when the building load was greatly reduced. During this period, the upper chilled water plant was kept operational to provide required cooling. The 10th floor heat exchangers were installed prior to decommissioning the lower plant in order to "break" the static head from the upper plant. Temporary chilled water pumps were installed in the lower MER until changeover to the new plant could be achieved.

Scheduled shutdowns were required to accommodate the construction of the new plant, two of these were electrical.

Several plant configurations were studied; the scheme chosen which best fit the design criteria was: