(a) Except as provided by agreement under § 20-704 of this subtitle, the Commission, county planning board, and district council may not exercise any planning or zoning power in any prior established municipal corporation in the county.

(b) Except as otherwise provided in this part:

(1) the county may not impose the administrative tax provided for under § 18-307 of this article in a prior established municipal corporation;

(2) any local law adopted by the Commission, county planning board, or district council does not apply to a prior established municipal corporation; and

(3) §§ 20-401 and 20-502 through 20-504 of this title and Title 22, Subtitle 1 and §§ 22-308, 23-102, 23-103, 23-301, and 23-302 of this article do not apply to a prior established municipal corporation.