The $550 million Empire State Building project went way beyond bike racks and water features. It called for refurbishing each of the building’s 6,514 windows while reusing 96 percent of the existing window glass; insulating the radiators with heat-reflective shields; using energy-efficient lighting, including sunlight; upgrading the chillers and air-handling units; using demand control ventilation to adjust the amount of outside air needed in the building; giving tenants online tools to monitor energy use; and upgrading the building’s controls for energy use.

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