It's far from gone-- the entire structure is still there but demo work is definitely underway and the entrance has chain link across it. I wonder if maybe they have to strip certain materials, mostly by hand, before heavy demo work can begin on the structure. Just a guess.
We were walking across the street earlier this week and saw: A pop-up canopy from the construction site caught the wind and flipped over the chain link fence and landed on people walking North on Harbor sidewalk, including a stroller. Not good! I don't think anyone was hurt, but the construction guys were scrambling.