Amoco Australia Pty Ltd v Rocca Bros. Motor Engineering Co. Pty Ltd (No.2)

Amoco Australia Pty Ltd brought proceedings against Rocca Bros. Motor Engineering Co. Pty Ltd in the High Court, seeking to enforce covenants in an underlease. The dispute involved a lease arrangement where the owner of the land leased the property to the supplier of petroleum products, who then underleased it back to the owner. The underlease included covenants requiring the owner to purchase all petroleum products from the supplier for the duration of the lease. Amoco argued that certain covenants in the underlease were unenforceable as they amounted to a restraint of trade, and sought clarification on the enforceability of the remaining covenants and the overall impact on the lease.

The legal issues before the court were multifaceted. Firstly, the court had to determine whether the unenforceable covenants in the underlease were severable from the enforceable terms, thereby preserving the validity of the lease. Secondly, it was necessary to assess whether there was a material distinction between conditions in a contract and covenants in a lease that could impact their enforceability. Thirdly, the court needed to decide if the entire underlease was rendered unenforceable due to the invalidity of certain covenants, and whether this, in turn, affected the lease itself. Lastly, the court had to consider whether the lease was independent of the underlease, despite assertions by the owner that the two were interdependent, and whether estoppel could apply.

The court concluded that the unenforceable covenants in the underlease were not severable, as their removal would fundamentally alter the agreement. The court found no significant distinction between conditions in a contract and covenants in a lease for the purpose of determining enforceability. It was held that the entire underlease was unenforceable due to the invalidity of the restraints of trade, which rendered the lease itself ineffective as it was contingent on the underlease. The court also found that the lease could not be considered independent of the underlease, as the parties had acknowledged their interdependence. The owner was thus estopped from claiming the lease remained valid in the absence of the underlease.

The court ordered that the lease be deemed null and void due to the unenforceability of the underlease. The decision underscored the importance of the interdependence of agreements in lease transactions and the potential consequences when restraints of trade are involved.