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Google
Booking is required exactly 2 weeks in advance (not a day earlier or later).
Tbh, I was a bit disappointed ... after a 2 week wait, I had expected lots of beautiful views all around the 51st floor, but the garden plants and railings means the views are obstructed (see pics). You have to climb onto ledges to get nice pics.
Considering how difficult it is to get a time slot, I wouldn't recommend jumping through hoops just to visit this rooftop garden. There are other places to get unobstructed views