Even if your organization leases space for its headquarters, you could focus on earning a LEED Platinum designation for Commercial Interiors. That was the strategy of energy company Exelon, which earned the rating for its 10 floors of space in Chicago's Chase Tower. Energy-efficiency measures include a system that dims lights in the daytime, extensive use of Energy Star technologies, and task lighting for individual employees. The current space uses 43 percent less energy than the company's previous digs. Approximately one-third of the furniture in the office was refurbished from other locations, and three-quarters of the construction waste was recycled. (Photo courtesy of Exelon)