Off-street parking shall be provided in accordance with §§ 154.375 through 154.379, except:
(A) Commercial uses. Commercial uses shall provide two spaces per 1,000 square feet of commercial floor space, unless a lesser amount is required under §§ 154.375 through 154.379, in which case the lesser amount will apply; and
(B) Commercial and retail uses. Commercial and retail uses in existing structures may change from one permitted use to another without providing additional parking.