The following shall be exempt from these regulations:
(A) Any final plat approved by January 1, 2003, and based upon a preliminary plat that was approved prior to January 1, 2000, subject to the development not being required to provide detention facilities by any other ordinances of the city;
(B) A preliminary or final plat of single-family development consisting of lots, all of which are one acre or larger; and
(C) Any single-family and two-family developed and undeveloped lots which existed on January 1, 2000.