(l) The Administrator shall refuse to sanction the erection, re-erection or modification of plan of any building incontravention of any rules made' under sub-section
(2) of section 5.
(2) The Administrator shall, in every case, communicate the sanction or modification or rejection of a building applicationwithin sixty days of its receipt.
(3) Where no communication is received by the applicant from the Administrator within the period specified in sub-section (2), the application shall be deemed to have been sanctioned and the applicant may, after giving fifteen days notice to the Administrator, erect or re-erect the building in accordance with the building application submitted by him to the Administratorfor sanction notwithstanding that such erection or re-erection contravenes the rules made under section 5:
Provided that when the Administrator modifies the building application within such fifteen days and communicates the modification to the applicant; the applicant shall erect or re-erect the building in accordance with such modifications.