The south tower is the one on the right.
And here's a webcam of the site:
http://www.onerinconhill.com/webcam.html
At 550 ft and 54 stories, this is NOT a supertall building, but the reason I thought it worthy of a thread here is that its slender shape and other features make it quite pretty from my perspective, but also it is sited on top of Rincon Hill. I'm not sure of the hill height, but it could be as much as another 150 ft above the Bay putting the top of the structure at more like 700 ft in the air above the Bay. Also, it sits right next to the Bay Bridge approaches and 80/101 freeways. It will dominate them and make a very impressive entrance to the city.