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Superstar
There are actually two kinds of parking. Parking spaces that actually belong to an owner and parking spaces that are exclusive use common elements. In both cases I think that the walls would be common elements and according to the Condo Act you ought to get permission from the Board plus an Agreement under S 98 of the Act before you drill into common elements. Some Boards turn a blind eye to minor encroachments like this, others do not and demand the formal Agreement (which costs $$ as it must be registered.)