The results of spatial element geometry calculation. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Remarks
 The subfaces of a SpatialElement at the base height and top height are not associated with floors, roofs, and ceilings at the same height.