With land and real estate being such a precious commodity in HK, why the gaping hole in buildings?
Simple : Feng Shui
It allows dragons to pass through unimpeded from the mountains to the sea, thus creating a natural air flow through the city and good Feng Shui.

Thanks for looking.
HAGWE!
Fernando

It certainly seems like the building is optimized for the owners view... Not sure I would want to live on the higher floors but it must be breath taking to look out over the surrounding area.
I also like the photo presentation, clouds, color, etc... on my browser there are artifacts or patterning along the building edges which is a little distracting. As far as I can gather nothing to do with dragons flowing through the city...
Casey