It 's biggest federal building project in D.C. area since Pentagon 68 years ago . Comment: First new building : Coast Guard headquarters , costing about $ 435 million .
It 's biggest federal building project in D.C. area since Pentagon 68 years ago . Complex to be on campus of historic buildings in long-neglected part of D.C. Project to gather more than 15,000 employees now scattered in 35 offices . First new building : Coast Guard headquarters , costing about $ 435 million .