Police Story 2 - Jackie Chan (1988) - Kar Wo Lei, So Kwun Wat

The gang's ramshackle factory building where they are holding May was most likely constructed just for the movie. I say this for three reasons: the first is that it gets completely destroyed at the end of the film, secondly, it looks temporary anyway (I expect most of the interiors were filmed elsewhere), and finally, aerial imagery of the area it was located in 1988, and just prior to, shows an empty space where you would expect to see a factory. However, if you know differently please feel free to comment.

Anyway, I managed to pin down the factory to an area near Tuen Mun called Kar Wo Lei. These days there is a small village development called Nim Wan Tsuen there, but back in the 1980s it was a sandy open bit of ground. The chimneys in the background belonged to the Lok On Pai Desalination Plant, which is still used to this day (minus the chimneys) as a large studio space (for example, I believe that Jet Li's scenes in Expendables 2 was filmed inside as well as Dead or Alive: Final and many more films I haven't covered).

Look carefully in the last images and you can see the flat reclaimed area that was shortly to become the Gold Coast Hotel and Resort area in the lower left.