There is a building that is constituted by Residential strata (28 units) and Commercial strata (2 offices and 2 retail shops). Residential block and Commercial block face each other and have got shared walls between courtyards as per following figure: Commercial Strata decided to enclose their courtyards (Courtyard 1 & 2 on the figure above). Enclosure would increase existing shared walls by 60 cm. Their floor level is lower therefore from their side it is about 25% increase, but from the Residential side it is about 40% increase: Commercial strata owner sent a proposal for wall increase to Residential strata. Residential strata had a meeting and didn't consent to the proposed enclosures. A letter from Residential was sent to Commercial with "No" for proposed enclosures outlining the reasons. Part of the proposed structure will encroach to private property - residential owners' courtyards. Therefore written consent from the owners of either common wal...