Name That Film Shoot

While walking along Post Street this morning, we came across the above "mysterious" sign at Taylor Street and wondered where the film shoot was. Then we happened to turn down Mason and encountered the film crew at Geary and Mason, as an SFist tipster noted earlier. The set-up was all still there on our walk back home this evening.
We're guessing it was for a commercial of some sort. They filmed a Quaker Oats commercial from the roof of our apartment building a month or two ago, and there were as many people, equipment, and cables stuffed into our lobby that afternoon as we've seen during feature film shoots around town.
Anyone got any info? Update: it's probably for a Milagro Tequila commercial. We thought "milagro" was a Hollywood code word or something.
Photos taken by the author
