Sept. 29, 2017 pics
^^^^ Hauling in fill. So I guess its not practical or possible at this time to use material from the potential office tower excavation to fill the hole. It seems like an incredible amount of work to excavate all that extra material, haul most of it away, then haul it back, compact it, etc. But, obviously, it must be cheaper than installing a shoring wall.
Also, in a previous post I noted a column on the second floor of the hotel with no supporting column underneath (visible in the image below). In fact it appears from the above image that the entire east side of the hotel has a significant cantilever on the second floor.
^^^^ Applying insulation to the top few feet of the garage. You can see that the garage itself extends out quite a bit from the north side of the hotel. This is also the case on the east and south sides of the building.
^^^^ They installed some temporary stairs. I expect we'll see an external construction elevator at some point.