In addition, section 4 of the Amendment Act introduced a new subsection (3A) which reads as follows : "Where a landlord has acquired his interest in the premises by transfer, no suit for the recovery of possession of the premises on any of the grounds mentioned in clause (f) or clause (ff) of sub section (1) shall be instituted by the landlord before the expiration of a period of three years from the date of his acquisition of such interest; Provided that a suit for the recovery of the possession of the premises may be instituted on the ground mentioned in clause (f) of sub section (1) before the expiration of the said period of three years if the Controller on the application of landlord and after giving the tenant an opportunity of being heard, permits, by order, the institution of the suit on the ground that the building or re building or the additions, or alterations, as the case may be, are necessary to make the premises safe for human habitation".