Construction on the Empire State Building, one of the world’s first supertall buildings, began in 1930. Nearly a century later, the architectural triumph is pushing the frontiers of energy efficiency. Empire State Realty Trust and RMI were able to reduce the Empire State Building’s energy consumption by 50% thanks to deep retrofits in the late 2000s. As part of the major upgrade, some 6,500 windows were remanufactured on site, to let in light but reflect heat. By cutting the building’s heating a

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