Nature of use that shall determine questions of increase of rent

In determining whether or not on an application made under section 14 or 15 of this Act or on a review of such an application any increase or reduction of rent ought to be allowed and if so the amount of such increase or reduction, a Tribunal or, as the case may be, the Minister shall take into consideration only the use for which the land was let under the contract of tenancy and shall not have regard to any other use that might be made or is being made of the land.