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Clark Construction, one of the region's biggest builders, has landed two major federal contracts totaling more than $660 million.

Clark Design & Build, a division of the privately held Bethesda company, has won a $435.4 million contract from the General Services Administration and Department of Homeland Security to build a new 1.2 million-square-foot headquarters for the Coast Guard, according to GSA spokesman Michael McGill.

The new building will be the first phase of a new, $3.4 billion, 4.5 million-square-foot Homeland Security campus on the site of the former St. Elizabeths Hospital in Southeast Washington, D.C. With a parking garage, the project will total 6 million square feet, McGill said, and when completed, the campus is to house about 14,000 employees.

Groundbreaking on the Coast Guard building is slated for next month, with occupancy expected by 2013. Of the total funding, $162.2 million is in federal stimulus money.

Meanwhile, Clark Construction won a $229.3 million deal with the Army Corps of Engineers to build the Army's Medical Research Institute of Chemical Defense replacement facility at Aberdeen Proving Ground.

Site preparation for the 526,255-square-foot complex began in April, said David Ruderman, a spokesman with the Baltimore district of the Army Corps of Engineers. When finished in May 2013, it will hold about 300 workers, mostly civilians, who will work on researching the effects of chemical weapons and developing treatments.

The building will replace one that dates to the 1960s and will increase efficiency and consolidate operations. The project is not part of the Pentagon's Base Realignment and Closure program, Ruderman said, though others at Aberdeen Proving Ground are BRAC-related.

Company officials could not be reached for comment on either project.

Clark Construction, with six regional offices in the U.S. and 4,200 employees, had revenues of $4.7 billion last year, according to its Web site. It is the nation's 14th largest general contractor and the largest in the Baltimore-Washington region, according to Engineering News Record.