In NSW Balcony “ownership” depends on when the building was registered as a Strata Title” property. If it was pre 1 July 1974, the balcony is included in the lot, the lot boundary is the balustrade/ outer side of the balcony edge and lot owner is wholly responsible for maintaining it. The balustrade is 50/50 owner & Strata. After this date, the balconies are common property BUT the attached lot has exclusive of the balcony.