(a) All retention basins;

(b) Commercial, industrial and multifamily development;

(c) Land clearing;

(d) Properties zoned residential (except multifamily dwellings) are exempt from this chapter with the following exception: (1) structures identified as a commercial occupancy in KMC Title 4 located in residential or mixed use zones requiring a building permit for new construction or any improvements of twenty thousand dollars ($20,000.00) or more, which adds square footage or a change of use as required in KMC 14.20.250(a).