The requirements of this chapter shall not apply to the placement of any structure for which building permits have been issued as of the date of the adoption of this ordinance codified by this chapter (March 5, 2012), provided that if such building permit shall expire, then a new building permit shall not be issued until the requirements of this chapter have been met. Provided further, that if an existing structure is to be reconstructed, enlarged, expanded, or otherwise increased:
1. In the case of building uses, in an amount 50% or greater of its existing ground coverage and/or total floor space; or
2. In the case of non-building uses or non-building portion of uses, in the amount 50% or greater of the existing developed non-building site area, then the provisions of this chapter shall apply.