It appears so. Judging by the renderings, the mechanical will add about 4 equivalent floor levels to the 76 floors.I'd imagine the top of the crane to be where the mechanical penthouse will top off.
Actually September 2012:From the archives, August 2011
The 4 level mechanical in the rendering is likely from the slanted roof version.It appears so. Judging by the renderings, the mechanical will add about 4 equivalent floor levels to the 76 floors.