The id of the MultistoryStairs element to which this element belongs.
If this stairs element is not a member of a MultistoryStairs element, this will be InvalidElementId.
Namespace: Autodesk.Revit.DB.ArchitectureAssembly: RevitAPI (in RevitAPI.dll) Version: 20.0.0.0 (20.0.0.377)
Since: 2013