As others have said the new steel is the lantern and it is built through the cooling tower structure. I suppose they will start to add that as well. And I do believe this building is now taller then the comcast towers roof. You can see on the tiny connectors on the steel where the cooling tower stops. And the cooling tower is taller the comcast roof line, correct?
What does this take us to now in height? 961 feet tall? We've definitely surpassed One Liberty Place now in height which would officially make this the second tallest building in Philadelphia and Pennsylvania