"It is projected that steel for the building will be visible above grade in 2008, with a topping out in 2010. The building is projected to be ready for occupancy in 2011."
This makes sense because right around that time the capital gains tax will revert back. I could definately picture people and organizations cashing out some of their holdings as a result of the capital gains changes. The result would be a dilution of the floats in the entire market forcing a repricing of equities. In addition, I believe the policies of the new incoming Democrat President and Congress will most likely not be friendly to the markets.