I'm trying to remember a game I played years ago. All I can remember is it took place in modern day, it was a PC RPG, and the game started out on a rooftop. I'm pretty sure it was a point and click type of game. It was a sci-fi type game.
I'm sorry if this is stupid, but I don't have any other ideas on how to find this game again. :P

Wasn't Future Wars by Delphine was it. Started out on window cleaners gondola outside an office block. It was a point and click adventure that started out moder day then became Sci-Fi.

Night Watch?

What was the art style like? Did you have weapons and fight a lot or was it mostly/entirely puzzle solving?

http://www.gog.com/en/forum/general/the_amp_039_help_me_find_this_game_amp_039_thread/

I'm checking out Future Wars and Night Watch.
It was mostly fighting, I believe.