Specifications include, but are not limited to: Convert direct expansion (DX) evaporator cooling coils to chilled water cooling coils in AHUsRemove existing air-cooled condensers, compressors, refrigerant piping, direct expansion (DX)evaporator cooling coils in built-up air handling unit, and five (5) packaged energy recovery units(ERU)Existing built-up air handling unit and ductwork to remain in Mechanical PenthouseExisting packaged energy recovery units (ERU) to remain, except for all direct expansion componentsProvide new 200-ton air cooled chiller on new structural steel platform on roofProvide two (2) new base-mounted chilled water pumps in Mechanical Penthouse, one as standby,and route chilled water piping between chiller, pumps and the air handling units.