It’s been a long time. The topic isn’t about a question. Needed a solution and created my own. Just wanted to share it.
What it does: Revit doesn’t give the landing area in the model, but the landing has surfaces, assuming that the landing area should be equal to the greatest value of components of the stair landing, I can get the solution.
Feel free to comment and correct. Thank you all.stair landing area calculated from geometry.dyn (11.4 KB)