I've seen other ways to get over/under UC, but my way is different than these. I found this out while waiting on a SLabs group on my warrior lol. The pics explain it all, but it's messy paint writing, so I'll type it here.
First, go to the east side of UC, right where the wall goes into the cliff. There is a little part of the cliff beside the wall that sticks out. This is where you'll walljump. Walljump up that cliff, jump into the wall of UC and there you are. You can see where the elevator doors go lol. From here you can also run straight to Hillsbrad and i think Arathi. Also easy access to WPL and gets you close to EPL. It's also fun to go here as a mage and slowfall down through the elevator to the bank. Have fun with this one guys! There are also many interesting things back here (a line of colour change, a hole in the ground etc...
Thats all for now twocents