—(1) The Board shall have and may exercise the following powers:
to hear and determine any application or proceeding for the purpose of fixing or apportioning the rent in respect of a tenancy of premises;
to make orders fixing such rent at a figure equal to, below, or above the current or standard rent as to the Board may appear just and proper; or to refuse to make any such order; and from time to time to review, vary or set aside any order made by it, as provided in section 11:
Provided that the Board shall not make any order under this paragraph fixing the rent in respect of the tenancy of any premises at a figure which exceeds the current or standard rent thereof plus twice the increase of rent permitted under section 7(1)(c);
to approve to the extent appearing to the Board to be just and proper any application to increase rent made under the proviso to section 7(1)(e);
to examine any witness on oath, to summon any person to appear before it, and to require any interested party or witness to produce any relevant document, as the Board may think fit;
subject to the approval of the Minister, to make rules not inconsistent with the provisions of this Act regulating the practice and procedure of the Board.
(2) Notwithstanding section 7(1)(d) or subsection (1)(b) where a landlord has since 1st January 1951 incurred or hereafter incurs expenditure in the improvement or structural alteration of premises (not including expenditure on decoration or ordinary repairs) the Board shall in fixing the rent of a tenancy of such premises take such expenditure into consideration so as to allow the landlord a reasonable return in respect thereof.
(3) Any landlord or tenant or other person interested may apply to the Board for an order fixing the rent in respect of the tenancy of premises of which he is landlord or tenant or in which he is interested. If the application is by the landlord, it shall be duly served on the tenant as respondent; if the application is by the tenant it shall be duly served on the landlord as respondent; if the application is by some other interested person it shall be served on both the landlord and the tenant as respondents.
(4) Where the premises concerned in any application or proceedings before the Board are sublet by the tenant either wholly or in part, the Board may in addition to fixing the rent in respect of the tenancy of the premises as a whole, and subject to section 22, fix the rent of any portion thereof which is separately sublet.
(5) Any person claiming to be interested in any proceedings before the Board may apply to be made a party to the proceedings and the Board shall give all interested parties an opportunity of being heard and of producing such evidence, oral or documentary, as may appear relevant to the Board.