R v Commonwealth Rent Controller; Ex parte National Mutual Life Association of Australasia Ltd

This case concerned an application for a writ of prohibition brought by the National Mutual Life Association of Australasia Ltd. (the landlord) against the delegate of the Commonwealth Rent Controller. The dispute arose after the Controller, following an application by one tenant, Dorothy May Clifford, for a variation of her rent due to an alleged error or omission, purported to re-determine the rents for all thirty-nine tenants of the landlord's building. The landlord contended that the Controller had exceeded his powers by re-determining the rents of tenants other than the applicant. The High Court of Australia was asked to determine whether prohibition lay against the Controller and, if so, whether his actions were lawful.

The legal issues before the Court were threefold: first, whether the Commonwealth Rent Controller, in exercising his functions under the National Security (Landlord and Tenant) Regulations, was required to act in a judicial manner, thereby making him amenable to a writ of prohibition; second, whether regulation 38 of the Regulations, which stated that determinations were final and without appeal and that no writ of prohibition or certiorari would lie, excluded the High Court's jurisdiction under section 75(v) of the Constitution; and third, whether the Controller had the power, upon a single tenant's application for variation of her rent, to re-determine the rents of all other tenants of the building of his own motion.

The Court held that the Rent Controller was required to act in a judicial manner, citing various regulations that mandated notice to interested parties, the consideration of representations, the ability to summon witnesses, and the protection afforded to witnesses and the Controller akin to judicial proceedings. The Court also affirmed that regulation 38 did not oust the High Court's constitutional jurisdiction to grant prohibition where a Commonwealth officer acted in excess of jurisdiction. Crucially, the Court found that the Controller had no power under regulation 23 to vary the rents of tenants other than the applicant, Miss Clifford, as his power to act "of his own motion" applied to making initial determinations, not to varying existing ones in response to a specific application by only one tenant. While the Controller could vary Miss Clifford's rent to correct the specific error regarding cleaning charges, he could not use her application as a basis to re-examine and re-determine the rents of all other tenants.

Consequently, the High Court made the order nisi for prohibition absolute, prohibiting the delegate of the Commonwealth Rent Controller from further proceeding on his determination of 29th May 1947 in respect of the rents of all tenants other than Dorothy May Clifford. The Court allowed the variation of Miss Clifford's rent to the extent justified by the identified error concerning cleaning charges.