Rooftops are a great place to get up. Your work usually stays up longer, it is more visible and toys usually don't paint over you. Many of Los Angeles' writers have taken rooftops to a whole new level with some doing full color work.
CBS (sorry, this is the best angle I could get)
CBS (Sorry, this is the best angle I could get.)
Ozer, Atlas LTS CBS - This spot has been running since 2005. I guess no one wants to go over letter master Atlas. If you have not seen it, I recommend you check out his documentary (scroll to the bottom for the video).