Illustrating the dramatic new attitude of commercial real estate owners toward sustainable building practices, TIAA-CREF has reduced energy use in its office portfolio and slashed approximately 37 million pounds from its carbon dioxide emissions. With the overall goal of reducing energy use by 10 percent by 2010, TIAA-CREF has also begun working to improve the energy performance of its 12,000-unit apartment portfolio. [also refers to ProLogis]