Make a reservation for dinner and let the elevator attendants know. You do not have to purchase a tower ticket.
You don't need to buy the observation ticket to go for dinner.
You don't have to buy a tower ticket if you are eating dinner at the restaurant. I would suggest making a reservation though.
Reservation is required to eat, you can just go for a drink (but it is safer to book) Tower sightseeing is separate.
You can go up with no reservations for drinks. If you want to eat dinner you need a reservation. Theres also a slide on the 70th which is $33
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