I recently came across a unique feature in Revit.  It is called the I-drop drag and drop feature.  The feature works by clicking the thumbnail image of the file and dragging it onto the Revit plan, elevation, section, etc.  Release the file into the appropriate view.  See the image below showing the highlighted file on the right that was dragged into the Revit file on the left.  Revit does not link the file; it recognizes it as an object inserted into the current view only.  After placing the object, the user can explode it if they choose to do so.  Just a reminder that if the baseplan.dwg  layout changes, the modifications will not be automatically updated.  The user would have to perform the I-drop command again or decide to link the import.