The crack through the 5 foot roof is the crux. It really helps to have a ton of tape or some crack gloves. The jams are painful otherwise. The left start is as tricky as the roof itself and makes the route a tad harder.
Location
This route climbs the middle of the south face of the Control Tower. It has two starts. From the rocks to the left climb past a roof with a chain at the lip, or climb overhanging jugs up broken face directly below the roof.
Did this route again with the left hand start and found the second roof to be quite challenging. I originally rated it 5.11 but it may be harder. We need someone that does this kind of thing now and then to give us a clue.