Slow progress?

The tenth anniversary of "9/11" and what has surprised me most watching the TV coverage, is that, ten years on, "Ground Zero" as it is called is still essentially a building site.  I understand that the question of ownership of the land is somewhat complex, and that there has been much discussion about what should be built there, but you would have thought by now much more would have been done.  If I were a relative of one of those who perished I don't think I would be very impressed.