A scene from yesterday morning over on East Sixth Street, where David Schwimmer is apparently moving into a newly created mansion ... someone left the above message on the plywood for the actor who played Ross Geller on "Friends" ... Marc, who lives across the street, snapped the photo and noted that workers later painted over the Rossffiti. Is David Schwimmer the 'Friends' star who now owns the demolished 331 E. Sixth St. townhouse?