Simple! Easy! The rules are simple – if you had a skyscraper floor, what would you put in it? Why would it be special? Etc! 1st person does Floor 1, next Floor 2, and so on!
Post your posts like this:
Floor #
This floor is home to bla bla bla. Why? Because yadda yadda yadda yadda yadda. Also, it has yabber yabber yabber yabber yabber. It also has yeah yeah yeah in it. Nah nah nah.
Floor 1
This floor looks like an ordinary hotel lobby by day. At night the laws of physics become rather malleable.
Once you enter this floor, a random list with 10 random tasks is created for you, some are very easy and many of them are extremely insanely difficult. you don't have to complete all of them to go to next floor, but if you complete all the 10 tasks, you'll get a randomly generated treasure chest with a VERY good loot. No one did all the tasks yet
This floor is an endless auction. Products sold range from useless trinkets to legendary artifacts. However, don't expect repeats of previous products because that'll just ruin the value of the products being auctioned off.