For the past decade, USAA Real Estate Co., San Antonio, has managed its portfolio of more than $4.9 billion in assets with energy efficiency in mind. But the seven-time recipient of the Washington, D.C.-based U.S. Environmental Protection Agency’s Energy Star Partner of the Year award decided to expand its efforts to include LEED certification from the Washington-based U.S. Green Building Council. In the fall of 2006, the company, which specializes in office, medical-office, industrial, public-sector, retail, multifamily and hotel properties, became one of the first participants in the pilot for LEED for Existing Buildings: Operations & Maintenance.