The provisions of this Section shall apply to the ground floor level of existing buildings along Tier A, Tier B, or Tier C street frontages.

1. Along Tier A frontages#
   
   Along the Tier A street frontage of a ground floor level, as applicable, no alteration associated with the continuation of an existing use or change of use shall increase the extent of a pre-existing blank wall, modify the location of parking spaces, or add curb cuts along a street frontage in a manner that would create a new non-conformity or increase an existing non-conformity by more than 10 percent with regards to the applicable regulations for a development or ground floor level enlargement. 
2. Along Tier B or Tier C street frontages
   
   Along the Tier B or Tier C street  frontage of a ground floor level, as applicable, no alteration associated with the continuation of an existing use or change of use shall introduce a use, reduce a minimum qualifying depth, increase the street wall width of restricted uses, reduce transparency, increase the extent of a pre-existing blank wall, modify the location of parking spaces, or add curb cuts along a street frontage in a manner that would create a new non-conformity or increase an existing non-conformity by more than 10 percent with regards to the applicable regulations for a development or ground floor level enlargement.