Thickness of the stairs landing. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | When setting this property: The given value for thickness must be greater than 0 and no more than 30000 feet. | 
| Autodesk.Revit.Exceptions InvalidOperationException | When setting this property: The landing type doesn't have monolithic support. |