It's a bit hard trying to figure out which property (or properties) was used for the interior of Lui Lok's house, seen when the gang leaders decide to take each other out during a supposed friendly "gong sau" meeting on neutral ground. However, the exteriors are a different matter and a hint is given in the acknowledgements as the filmmakers thank the World Wide Fund for Nature. It turns out that the location was Island House in Tai Po, now a WWF office and a place I am quite familiar with thanks to my 6 years living just up the road from here.
Anyway, this is the place where Big Sha and Ho fight off a horde of marauding triad gunslingers before being rescued on a motorbike by "Dummy". If you want a comparison, someone has kindly included a bunch of photo sphere's all around the property. This one relates to the bottom image.
