The Elton John biopic “Rocketman” opens Thursday at the North Park Theatre – but it isn’t the featured attraction. Top billing belongs to the North Park Theatre’s restored ticket foyer, proscenium fresco and exterior facade. The 1920 theater’s third and last phase of restoration once again reveals the grandeur hidden beneath decades of dirt and grime. It also positions the theater into tip-top shape in advance of its 100th birthday in 2020. “I’ve been coming here my whole life and was absolutely stunned,” said Delaware Council Member Joel Feroleto after a sneak preview Tuesday. “It took my breath away.” One showstopper is the second-floor Art Nouveau stained-glass windows that haven’t been seen from inside the theater in more than 60 years. They’re now visible following the removal of a dropped ceiling, more than doubling the ceiling’s height to over 30 feet. The windows are believed to have been plastered over and covered in the lobby with a cement ceiling between 1948 and the early 1950s to hide the “Shea’s North Park” name etched into the glass. The decision was made by the Loews m...