In NSW with regard to a townhouse or free standing villa who paints the exterior walls facing onto the garden (in QLD it’s the owner). In fact you are suposed to ref the plans to check what is common property (thick black lines) or lot property (thin black lines).
Problem is our plans are a collection of thick and thin lines bearing very litttle relationship to the intension of the act. The whole of the upstairs of my town house is common property (even facing the garden) but the downstairs facing the garden is lot property.
I believe the Act definations should apply unless OC authorize changes and then the new plans take precedence. I don’t think the person who drew up our plans had a clue.