Anchor point of the Leader 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2016 
Syntax
Remarks
 Anchor is the leader's point that is attached to an annotation (a tag, note, etc.) This is a read-only property, for the this point gets always computed based on various properties of the annotation element.