It seems that the laws in NSW to allow OCs to limit the number of occupants per apartment are in the pipeline:
APARTMENT owners will be given greater powers to fight overcrowding and ”hot-bedding” in their blocks under new strata laws to be introduced by the state government.
Owners’ groups will be able to set a maximum headcount in flats based on floor space or the number of bedrooms, it is understood. A limit of two adults per bedroom, except in special cases, is likely.