CodeGreen | 11,908 followers on LinkedIn. Leading the Real Estate Industry to a low-carbon future | CodeGreen is a leading national sustainability and energy efficiency consulting firm. CodeGreen provides comprehensive energy management and sustainability consulting for real estate owners, investors and managers covering over 650 million square feet of property nationwide. CodeGreen’s team of over 60 energy, sustainability, and data professionals partner with some of the largest real estate companies worldwide to provide more energy efficient, sustainable, resilient, and healthy buildings to increase returns, reduce risk and protect long-term investments.