I brought that up a while back as I didn't see them building elevator shafts for the office portion. Someone mentioned they could be covering them up, but I don't recall seeing any rectangular openings left in the concrete when they were pouring any of the levels and I stare at these cams all day, lol. My guess is, the tower crane is in one possible elevator shaft (but would only fit about 1 car). But this building will need much more than that.
Edit: Looks like a small rectangular opening my be towards the left where the wooden temporary railing is. Looks a little narrow for elevators though. Also, looks like the residential portion may be topped by this weekend. Amazing how fast this went up after it seemed like the first 3 levels took like 6 months to complete.