Can survivors with the jump skill jump into/off towers in Zombicide: Black Plague - Wulfsburg Expansion?
No, you can't use jump to move into/out of a tower, as the towers are surrounded by ramparts which specifically block movement.

From the Wulfsburg rules (page 5):


  Tower tiles feature both building and street Zones, bordered
  by ramparts ....
  
  
  Ramparts can’t be crossed but don’t block Lines of Sight.