“An average commercial office building in Chicago of around 300,000 square feet might have an EUI [energy use intensity] anywhere between 70 and 100, depending on what you’re putting in there,” said Jay Longo, AIA, LEED AP BD+C, Principal and lead on the 310 N. Sangamon project. “We’re trying to achieve EUIs in the 20s. That’s very, very low.” 

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