Does the bar provide access to the deck with the panoramic view of the city?

Mario (below) is right. The restaurant does not have a deck, but a great view. However, one floor below the restaurant is Oue Skyspace, which I believe does have a deck

There is no deck, however, the bar and restaurant does have floor to ceiling windows with panoramic view.

No. Entrance to the Sky Terrace as a separate charge

Not sure about he bar. Not sure about any exterior zzccess at all ..especially LA