Sub section (2) of Section 6 has also considerable bearing on the controversy between the parties and it may, therefore, be set out in full: (2) Notwithstanding anything contained in sub section (1) (a) in the case of any premises, whether residential or not, constructed on or after the 2nd day of June, 1951, but before the 9th day of June, 1955, the annual rent calculated with reference to the rent at which the premises were let for the month of March, 1958, or if they were not so let, with reference to the rent at which they were last let out, shall be deemed to be the standard rent for a period of seven years from the date of the completion of the construction of such premises, and (b) in the case of any premises, whether residential or not, constructed on or after the 9th day of June, 1955, including premises constructed after the commencement of this Act, the annual rent calculated with reference to the rent agreed upon between the landlord and the tenant when such premises were first let out 459 shall be deemed to be the standard rent for a period of A five years from the date of such letting out.