Many thanks to Arthur for spotting this location by identifying the multi-storey car park seen in the background.
Here is a brief reminder.
FOr some reason this did look familiar but I just could not place it, but now Arthur has told me that it is in fact a building in East TST called Auto Plaza I feel like slapping my head.
Of course, it is just background to the scene where Pak (played by Tzi Ma) follows a local stripper back to her flat whilst investigating a murder. He ascends to the roof top we see above and spies on her from there.
Sadly the angle is ambiguous and I'm not sure if this roof top was the one on top of the still standing Union Mansion building (built 1966) on the opposite side of Chatham Road South, or perhaps on a building that has since been replaced by Railway Plaza (build date unknown). It's too close to say one way or another but I am erring on the side of Railway Plaza because of the angle on the edge of the car park that we can see.
But anyway, here is a ground level Streetview to show that the car park is still there. You can just see it with a newer paint job peeking through the gaps in the trees.