Less intereference from the Nemesis in the Raccoon Press
It's possible to prevent the Nemesis from chasing you around the Raccoon Press. If you're not playing on Hard mode or if you want to avoid him, this is useful for grabbing everything in the office on the top floor of the building without him chasing you around it.
Firstly, meet Carlos in the Restaurant. After the conversation, the Nemesis will appear. Choose to escape through the basement (note that you must have opened to manhole first, although I think that's necessary in order to initiate conversation with Carlos anyway). Run to the end of the passage and escape through the air vent.
You should now be in he shopping arcade. After Carlos runs off, head to the save room, and then exit (save if you like). The Nemesis will be outside once you leave. Run past him (if he's in front of you) and exit the arcade into the area outside the Raccoon Press building. The Nemesis will chase you around here, so quickly run to the Raccoon Press building and enter.
Provided you have done what I have told you, the Nemesis will not follow you inside for the time being (if you hear him mutter 'S.T.A.R.S.', then it's confirmation that you have). Run up the narrow staircases until you reach the top, and enter the door. Once inside, follow the passage and then go into the office. The Nemesis will not be in here. Grab the Green Jewel and everything else you want (don't miss the Reporter's Memo) and leave. The Nemesis will suddenly appear just outside of the office without the sounds of any door opening. Just run past him and exit. He will not follow you into the staircase hall, and probably won't chase you outside of the Raccoon Press office either.
Added by: Volke Apr 27th 2009, ID#15530