Who Hired Trump as a Military Contractor?

Can this possibly be right? The proposed American embassy in Iraq will cost $1.5 billion? What are they doing, building it out of diamond for bulletproofing? As Atrios notes, that's about the same as the projected cost of the Freedom Tower to be built on the site of the Twin Towers.

UPDATE: Commenters find info suggesting we're talking about a fairly vast complex—and given that you can build a pretty hefty office building for a few mil, it'd have to be—which helps to explain the cost, but is sufficiently unusual for a traditional "embassy" that I wonder how it'll look to Iraqis.