Umm, Multiple towers go live in SF every week. S4GRU reported 21 tower upgrades last week, 21 the week before that, 37 the week before that, and.......
If you want to know more and the exact location of each tower, become a S4GRU sponsor: http://s4gru.com/index.php?/topic/1195-information-about-s4gru-sponsorship-levels-and-how-to-become-a-sponsor/