D24***13you can go there and direct buy ticket. the people need to wait for at least an hour going up the the building, also from 80th to 86th floor. recommend people to go there before 3pm, so they can see the sunset.
D24***13the central is very beautiful, the day I went there is good weather on Christmas. not very crowded. but many people waiting for ice skating there. people walk slow there. I like to have a walk there.