Why am I a member of multiple owners corporations?

Larger owners corporations (and some smaller ones) are generally set up with multiple owners corporations so that costs associated with maintenance and repairs can be allocated to only those owners who are receiving a benefit.

As an example, multiple owners corporations might be set up where only some owners in a building own and have have access to a car park. In this scenario two owners corporations would be set up, one for the car park and one for the rest of the areas of the building. This way cleaning and electricity costs for the car park would only be paid by those owners who own a car park.