Jimmy, I think your advice is wrong and you have missed the point. If there is a lease which includes those parking spaces then the landlord i.e. the owner of that property, be it Strata title or not is in breach of the lease conditions by not stopping others from allowing the lessor to use those spaces for which he is paying. It has nothing to do with the Strata Committee for the building. His remedy is a claim against the landlord for breach of contract and NCAT may not have jurisdiction as it is not a strata title issue as opposed to a breach of contract of conditions of a lease on property be it strata or otherwise. I would send a threatening letter to landlord, not the strata committee, demanding it remedy this problem otherwise he will take it further be it to Fair Trading if it has the jurisdiction or elsewhere.