On location Episode 104 "Code Green"

Although "Three Rivers" is set in Pittsburgh, most of any actual outside or "location" filming for the show will be shot in Los Angeles, carefully disguised as Pittsburgh through the magic of editing stock footage into the scenes or the even more magical application of computer generated images (CGI).
Three Rivers is set inside a hospital and therefore most of the footage will logically be shot on their beautiful hospital sets at CBS Paramount. But, on the rare ocassion that the actors get to venture to the out of doors, I'll try and find the locations for you. (I keep asking myself why I didn't fall for one of the actors on NCIS:LA as my life would be a lot easier location scouting wise!)

So here we go, Epsiode 104 "Code Green".
The helipad for the fictional "Three Rivers Regional Medical Center" is actually on the rooftop of 220 S Spring Street in Los Angeles, CA. According to the location filming rumor mill, the scenes for 104 were shot August 24, 2009.
I've attached a few screen caps from the episode and also a few snaps of the area via googlemaps. Please excuse the quality on the snaps as I'm a video editor not a screen capper. :-)
(In other words, I do better with moving subjects!)











As these shots set precedence for the show, I would suspect that the location will be used again and again through actual filming of more scenes and/or reusing those already filmed.
My guess is that the helipad shot that is in the opening credits was also shot on the same day.