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WASHINGTON, D.C. — Tishman-AECOM will build the $16 million first phase of the U.S. Department of Homeland Security's new headquarters. The development will be located in Washington on the site of the former St. Elizabeths hospital campus. The first phase also includes a U.S. Coast Guard headquarters building, a parking structure and an 80-megawatt co-generation plant. The entire project, which will cost between $3 billion to $4 billion, will be complete by 2016.