If you have parking or a storage locker space that also adds to your maintenance fees.
And I'm not sure if this is really true or not, I've heard that even the amount of balcony space also affects your fees as well as you have more exclusive rights to limited common elements that everyone pays for the maintenance and repairs for.
I agree that the whole calculation of maintenance fee structure is not really fair. A single person living in a 1,200 sq.ft. unit would be paying a lot more in fees than a couple and their young child living in 750 sq.ft. doesn't make sense.
Having it based on the number of bedrooms is a good idea, but anyone could add a bedroom or at least a bed without the management knowing about it and also dens could be used as a bedroom as well making it difficult to calculate a fair fee. I think it should be based on the number of residents living in the building, as many property management companies collect information on who lives in the unit for fire safety purposes.
I think there should be an extra fee for those who rent out their units, as tenants put a higher demand on the building's maintenance. They typically care less about the building, landlords don't really check up with their tenants that much, and these units face a higher turnover.