law: 7. Notice of increase of, or addition to, rent.-
  (1) Where a landlord wishes to increase the rent of any premises, he shall give the tenant notice of his intention to make the increase and in so far as such increase is lawful under this Act, it shall be due and recoverable only in respect of the period of the tenancy after the end of the month in which the notice is given.
  (2) Every notice under sub-section (1) shall be in writing signed by or on behalf of the landlord and given in the manner provided in section 106 of the Transfer of Property Act, 1882 (4 of 1882).
  (3) For the avoidance of doubt, it is hereby declared that the provisions of this section apply equally to any increase in rent payable by the sub-tenant.