Alexander, i think some of the rooms in your linked file are unplaced that’s the reason your having different counts. I checked the first Python. it is processing all rooms. Try another nodes or methods.

And here how to number of elements in rooms.

HI Artem,

Here is another method:

I have the same. No problem tell me what you need I will find out another method.

I look at your file its working from my side. which version dynamo your using?

Alexander, Can you tell me what are you looking for?

Hi Alexander, Below are some methods where you can get room by levels. Good Luck!

Method-1

Method-2

Hi Alexandr,

There are some custom nodes which can give you rooms from each level. See below graph. Good Luck!