Yes there are booths
Yes there are booths behind the floor
Contact them ahead of time and tell them you need handicap seating and they need to accommodate you.
They have VIP sections and bottle service. Other than that its a standing venue.
There are a couple of booths at the back for the big stage but I don't think there are for the little one.
There are some reserved seating areas, but it depends on the show. You have to reserve it directly from the venue and there is most likely an additional fee
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