Well, the entrance to the Gershwin is under this like parking garage thingy. Well if you are standing on the street at the entrance to the parking garage, under a Wicked Marqui, and you're looking under the parking garage -- the entrance to the theatre is to your left. From that position, if you go to your right, the stage door is right over there.
I'm pretty sure what you do it enter the gershwin on the left side building and then when you walk to the theatre, I think everyone is passing over the parking garage entrance to the opposite building. And the stage door is in that building. So essentially its in the building opposite the theatre entrance. Tell me if I've completely confused you. If in doubt, just ask one of the box office people or ushers.
"gimme a bottle of bourbon and half a chicken and i'll conquer the world!"