Built in 1958, the original Zorinsky Building, home to the U.S. Army Corps of Engineers, Omaha District’s headquarters, was erected before the modern world embraced the environmental movement. Since the first Earth Day in 1970, renovations to the 432,000 square-foot building managed by the Government Services Administration have been implemented based on the standards and criteria of the U.S. Green Council’s Sustainability Program to make the building more energy efficient and environmentally friendly.