—(1) A landlord may increase the rent of the premises let by him only in the cases and to the extent following:
where the current rent is below the standard rent, to the extent of the difference between those rents;
where the current rent is below the rent fixed by an order of the Board, to the extent of the difference between those rents;
where the premises were let on or before 1st January 1941, and there has been no increase of rent subsequent to that date, to the extent set out in the third column of the Schedule in respect of the types of premises and the standard rents thereof set out adjacent thereto in the first and second columns of that Schedule:
Provided that the Board may in any such case make an order fixing the rent, and in that event the landlord shall not increase the rent above the rent so fixed;
where the landlord has after the commencement of this Act incurred any costs, charges or expenses for any improvements to or for the benefit of the premises for the purpose of constructing roads, sewers or drains or the installation of modern sanitation or for any other purpose under and in accordance with the provisions of any written law or by agreement with the tenant, then the landlord shall be entitled to increase and receive or recover a rent in excess of the standard rent the amount of such increase to be fixed by the Board on the application of either the landlord or the tenant. Any increase of rent fixed by the Board under this paragraph shall be in addition to any other increase of rent permitted under paragraphs (a), (b) and (c);
where since 7th September 1947, the rates or the property tax payable by the landlord under the provisions of the Municipal Ordinance or the Property Tax Act [Cap. 254], in respect of the premises have been increased, to the extent of the increase:
Provided that in any case where an increase, other than an increase permitted under this subsection, has been made to the rent since 7th September 1947, a landlord shall not increase the rent of the premises under this paragraph without the approval of the Board.
(2) Nothing in this section shall be deemed to relieve a landlord from the necessity of determining the tenancy according to law prior to increasing the rent.