How should I build path for that kind of architecture?

Can you advise how to scan that kind of architecture. I mean I need nodes at the first floor and second floor, but atm a don’t have nodes on 1st floor under second floor.

Guess I’ve find the answer. I need a Pro for that. Should I use Recast Graph or Layered Grid Graph and which is less performance heavy?

Correct, that requires pro, or lots of fiddling with multiple grid graphs and links between them.
Recast Graph is definitely less performance heavy and I would suggest using that.
The major drawback is that you cannot update it during runtime (without very noticeable lag).