Head for the elevator.

You head for the elevator. Afterall, that’ll be the fastest way to the roof and you don’t want to risk anyone seeing you. Although for all you know that ship has already sailed…

You feel your way along the wall until you can hear the mechanisms of your building’s elevator. Turning your back to the wall, you find the call buttons and press the one on top. In short order, it dings and you rush inside.