Gets the individual stairs or stairs group on the given base level. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2018 
Syntax
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Parameters
- levelId
-  Type:  Autodesk.Revit.DB ElementId  
 The base level id.
Return Value
The id of stairs element on the given level.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |