The building is shaped in a V format so only part of it gets the morning sun. The darker areas are portion of the building in shadow. Typically, I underexposed by about 1.5 stops to avoid clipping the highlights, hence the darker shadow areas.
The clouds were moving but they tend to stay at the side of the frame and lighting was just too bright. I was in the region of 1/320 so even a 10 stop ND isn't quite enough for that kind of effect
None from the pinnacle roof top for the moment. Didn't have the tripod yesterday. Probably will go back sometime before CNY.