Clause III: The plans, sections, elevations and specifications for the construction of the buildings to be erected upon the said premises (and, if of steel or reinforced concrete, calculations) shall be prepared by a Licensed Architect or Architects and shall indicate in figure the length, breadths and thicknesses of walls, floors and scantlings to timber and state the description of the materials to be used and such plans, sections, elevations and specifications shall be submitted to the Municipal authority & thereafter to the said officer in quadruplicate and got approved within six months from the date of handing over the possession of site before the work of construction is commenced. The said intended Lessee shall not make any alternations in or additions to the building so approved as aforesaid either external or internal so as to affect any of the architectural or structural features thereof appearing in the approved plans unless such alternations and additions shall have been previously in like manner approved.