I work at GreatAmerica and we heard a loud crash, a couple of people saw it happen. Someone was driving the crane at the building site (8th ave, near the Helen G. Nassif YMCA)of the new Federal Court Building and it was swinging back and fourth and finally fell over. Crushing part of the office they had built and a Ryan properties truck, it looks as if everyone is ok. We saw the driver climb out of the cab of the crane.