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CHICAGO — Zeller Realty Group’s 1.3 million-square-foot 311 South Wacker office property has received LEED Silver certification from the U.S. Green Building Council. Zeller Realty Group acquired the property in March 2014 and implemented a capital improvements program that included upgraded infrastructure, improved retail offerings and the construction of a 21,500-square-foot tenant lounge and conference center. To achieve LEED Silver certification, Zeller implemented a sustainable site development, water savings, energy efficiency, materials selection and indoor environmental air quality program to upgrade the property.