Hi
One of my jobs was to commission those buildings ready for occupancy.
The problem there is both the hot water and AC are provided from a single heating and cooling supply on the rooftop.
Therefore they cannot measure the individuals usage.
The only item they can measure is your domestic water and electricity as they have individual flat meters.
Before anyone asks, yes, if someone is at home all day the others will pay a portion of this but the occupiers' electricity will be higher because of running the fan coil units (3 in each apartment)
Regards