One of the pedestrian overpasses in Central has an exhibition running right now called Density 2.0. Here is a photo of one of the posters talking about Hong Kong’s typical “8-units-per-floor” tower plan.
Noteworthy is the fact that the floor plates contemplate minimal tower separation distances. This allows multiple towers to be built right beside each other. As a point of reference, the guideline in Toronto is 25m between tall buildings.