Sec. 1202. (a) ADVISORY. In a county that has a county plan commission or a metropolitan plan commission, after the county has adopted:
(1) a zoning ordinance that establishes reasonable districts for:
(A) agricultural, residential, commercial, and industrial land uses;
(B) adequate setback lines; and
(C) area, bulk, and height restrictions; and
(2) a subdivision control ordinance that imposes restrictions at least equal to those established in the zoning ordinance;
a township may not join with a municipality for planning and zoning purposes. This subsection does not affect a joinder agreement implemented before the county adopts ordinances of the character set forth in this subsection. Such a joinder agreement continues in effect until the township withdraws from the joinder under section 1212 of this chapter.
(b) ADVISORY. If a county has not established a county plan commission or a metropolitan plan commission or adopted ordinances of the character set forth in subsection (a), a township may join with a municipality for planning and zoning purposes.