The interior of the second floor is still in progress, the floor is still concrete, the floor finish is going to be one of the final things to be installed. The electrical and mechanical wires are intalled and run through the spaces in the floor joists. We can also see the plumbing pipes.
The man working is a carpenter and is working by the emergency light because the lights in the building have not been turned on yet.
This is opening by which the gypsum board was being transfered and we can see the stacks on the right. The header of the opening and the studs of the wall are visible, as is the plumbing work. The cavity on the left could be an elevator shaft, the cables are clearly visible.