This photo is from June 11 of this year. (Please click.)
This photo is from August 18.
This is from September 1.
And this is from November 16.
I wondered if they were going to take the whole building down and emailed the San Francisco Chronicle's excellent Architecture Critic, John King, to ask him that question. He replied that the building in question was the former AAA office building. It had been sold and the new owners had stripped off the utilitarian concrete facade and intended to sheath it in glass and remodel it into high rise apartments to feed SF's insatiable hunger for housing.
The building is now modestly covered in fabric. This photo is from today. I'll update when the building reveals its final form.