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.
Floor 380
This floor is in space, there's a portal on Floor 379 and another one in Floor 381, in the Earth... this floor is one of the most crazy floors in the building...
This floor is actually a giant trash compactor, which some prankster decided to put a portal into. Once every six months, pneumatic pistons on the exterior walls compress the contents of the entire floor into a block roughly the size of a Sherman tank. The garbage is then dropped through a hatch in the floor and jettisoned from the building. On any other day, it is generally safe to enter, though.
This floor shares all pain and injuries with other people on this floor. Death is prevented on this floor to prevent suicidal people taking advantage of this.
This floor uses the mist from below to have awesome raves at night. There's also a lot of furniture in this floor. Rumor says if the mist from below stops, the furniture will rave and the people will act as furniture :P
Everything you say in this floor has to be in low voice, if you shout here or speak in a normal voice, you are thrown out of the building, it's hard to hear because of the floor below too...
This floor contains a giant slime which consumes all in it's path. To prevent it from escaping, it is left in a massive fenced off pit which is lined with anti-sticky material.