I'd like to know if there's a way to get back up in the clock tower after you've jumped down from catwalk to catwalk in the last part of the section 'Upper Clock Tower' in the mission 'Killing Time'.

And if so, how? I want to know if I forgot to take loot (I have to collect 90%) and I cannot seem to find a way back up, not even with my climbing gloves, so any help is appreciated.