WASHINGTON—A joint venture of Tishman Construction Corporation of D.C., and AECOM Technology Corp of Los Angles has been added to the $435-million first phase of the U.S. Department of Homeland Security’s new headquarters at the former St. Elizabeths psychiatric hospital campus in Washington. The $16-million federal indefinite delivery/indefinite quantity contract covers construction-management services for phase one.

The first phase involves multiple, interdependent projects that Tishman-AECOM will manage, beginning with the new U.S. Coast Guard Headquarters building, parking structure, 80-megawatt co-generation plant, and infrastructure projects.

The overall DHS headquarters consolidation is the largest current construction project in the U.S. and the largest federal project since construction of the Pentagon. All phases of the construction program, estimated to be between $3 billion and $4 billion, are scheduled for completion in 2016.