i have a 3 story, but i have NO clue which numbers they are, as I got the cage from Jill.
I had to remove the bottom storage level just to fit it in my basement, so i must have the 2 story with the add on. It is still very tall, however I can clean everything except one shelf that is higher but i am only 5'3. it is HUGE, much bigger than I expected. but the boys seem to love it.
it is very sturdy without that bottom storage area. since all my food is in big tubs, there wasnt much to store under ther anyway.