The tower in The Bowery district | Casefile Reports Batman: AO Guide

The moment of reactivation f the tower in The Bowery district

The tower in The Bowery district becomes available after you start the game although, you lose the access after you complete the Deactivate the jamming signal main mission. As a result, you need to make it available again and, since the unlocking is a part of the main storyline, to learn more, you should see the description of the Deactivate the jamming signal #2 mission.