Help on a doubt floors

Well I have a doubt, as I would call it, or if I would put it in my game, system of floors, similar to tibia for both places / houses of 2 floors, 3, and so on

example:

 

I recommend using an isometric tilemap, and hiding any layers above your current layer so that you can see inside buildings: https://docs.unity3d.com/Manual/Tilemap-Isometric-CreateIso.html

 

I do not think it's necessary, I changed it to isometrico, and everything changed, the only thing I wanted was that it had floor +1, floor -1, example when climbing the stairs it would go up, or down in the sewer it would go down , just as it works on the tibia, would it have any clue how I could do it? or who could do it? I would pay for it myself.