the ones on the sides on first floor, if you get there early, you can sit or stand up there.
It's only one row. The one's above will have the tables and have seats behind.
here's a pic of the steps/bench. (right side)

so that's floor, step1, where drinks are, nobody sits there, my foot where i can stand, and im sittin on the floor where the tables are at.
view from where I stood (This is on a Thursday)
there's also the 'bottle service' to get a table. I dunno if each person has to get a bottle or just for the party. A bottle goes over $100.
Oh and dont stand or sit near the left exit if you dont like cold air being blown down. They blow this smoke screen with the confettis every once in a while from the top and that stuff is cold.
This is on a Saturday. (standing from the left side near exit)