Gets all the levels the given stairs group placed on. 
   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
- stairs
-  Type:  Autodesk.Revit.DB.Architecture Stairs  
 A stairs element in this multistory stairs element.
Return Value
The ids of base levels of the given stairs in this multistory stairs.Remarks
 If a stairs element is a stairs group, it gets all the base levels of each member of the group; If a stairs element is an individual stairs, it just gets the base level of the stairs element. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | The input stairs is not a member of this multistory stairs. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |