The Duke Energy Building is a historic, 18-story, 269-foot-tall structure in Cincinnati, Ohio. It was designed by Cincinnati architectural firm Garber & Woodward and John Russell Pope. The neoclassical tower was completed in 1929 for the Cincinnati Gas & Electric Company and served as the company's headquarters until its merger with Duke Energy in 2006. F…The Duke Energy Building is a historic, 18-story, 269-foot-tall structure in Cincinnati, Ohio. It was designed by Cincinnati architectural firm Garber & Woodward and John Russell Pope. The neoclassical tower was completed in 1929 for the Cincinnati Gas & Electric Company and served as the company's headquarters until its merger with Duke Energy in 2006. From 1946 to 2011, CG&E sponsored an annual holiday model train display in the building's first-floor lobby.