[@Elgappa]That is also a ship I had in mind lol

Okay... uh couple other store ideas...

The fire religion has an outpost in one of those stores that just sells fire places! They found it one day and just lost their tiny rat minds! Meanwhile across the store the creators religion has formed their Vatican in a DIY store, the ultimate place of creation!

For the second floor, what if it has a high concentration of stores that sell stuff like makeup, perfume and bath products? It has a reputation as being the most "Civilized" area of the mall where the rats bathe the most. Maybe there's even a pharmacy so part of the floor is considered a spa area that rich rats go to and is treated like neautral ground. While in another area their wealth and luxury has gone mad and they've even set up a Colosseum where rats and other beasts can come and fight to the death!