All Tier II sites shall be regulated by the provisions set forth in this Section. However, any enlargement on Tier II sites of an existing building, provided that such enlargement does not increase the lot coverage of said building, shall be exempted from the provisions of Sections 119-211 (Lot coverage, floor area and density regulations), 119-213 (Grading controls) to 119-217 (Tier II controls during construction), inclusive, 119-22 (Tier II Submission Requirements), and 119-23 (Administration of Tier II Requirements).