Very well done; I love the dark, brooding mood you've captured in the print (although I think downtown L.A. has come a long way!).
I used to work at the Aon building on the right of the frame (actually, probably should be on the left as the image seems inverted). Thanks for this image. I really love it.
Fantastic tones. The sign at the bottom of the print, with its inverted type, is something of a distraction. You might consider cropping it out entirely.