So this is a very poorly made layout but it's just to give a general idea of where everything is. Yes i used PAINT to label the picture. I forget what movie it's from; I found it randomly on the internet.
After I elaborate on the picture I'll elaborate on each section.
As you can see the top three floors (Floors 93,92,91) are the Avenger's HQ.
The floor below (the level where Tony walks along the runway and gets his suit taken off and where the bar is) is the "Party Deck".
The next 10 floors below that is all R&D (Research and Development).
The next 7 floors are living quarters for everyone and the two below that is Bruce's "Panic Room" (His floor is directly above it)
From there down the floors are random and will either be a pool, gym, library, armory/weaponry, etc.
At the very bottom is the lobby and Tony's garage.
Avengers' HQ:
It's actually quite hard to think of what should be on each level since there are three. It would've been easier with just one floor being the HQ but 1)This is still technically Tony's tower and 2) I read that in one of the comics Tony gave up the top three floors for the Avengers.
So in general there are computer stations, monitors, and other fancy gadgets and equipment that they might need split up amongst the three levels.
Party Deck is self explanatory, it's the same as it was in the movies.
R&D:
These floors are also pretty much self explanatory. In the movie
Avengers Tony mentions to Bruce that the "top ten floors are all R&D". I decided to interpret this as the top ten floors below the party deck.
Living Quarters:
Each person/Avenger has their own floor. At the end of
Avengers Tony is seen looking at Captain America's square of information for his floor. (He had each square with a symbol for each member. See below pic)
Hammer for Thor, Bow for Barton, Shield for Steve, Helmet for Stark, Something i can't tell what it is for Natasha, and a DNA strand for Bruce. Obviously with Rikku added i had to change who went where and all.
My order is Tony(&Pepper), Thor(&Jane), Rikku, Natasha, Barton, Steve then Bruce.
Bruce's Panic Room:
The two floors below Bruce's floor are combined into one floor. Reenforced steel, no windows, etc. This is for when/if Bruce is going to Hulk out and Rikku isn't there to calm him down (or something like that). In Bruce's apartment/level there's a - I don't want to call it a shoot or a slide... it's like a... - cylindrical tube type thing (like at a water park) where Bruce goes inside and presses a button. The floor will then drop from beneath him and he'll quickly fall into the panic room. The only way for Bruce to get out is for someone to release him or when he's back to normal for him to speak a pass-phrase to Jarvis who will then open the large steel doors leading to the elevator.
