1. If the governing body of each of two or more communities declares, by resolution or ordinance, that there is a need for one land clearance for redevelopment authority to be created for all of such communities, and has made the findings required by subdivision (2) of section 99.330, a public body, corporate and politic, to be known as a regional land clearance for redevelopment authority (herein referred to as regional authority or authority) shall thereupon exist for all of such communities and may exercise the powers and other functions of an authority under this law in such communities.
2. The area of operation of a regional authority shall be increased from time to time to include one or more additional communities if the governing body of each of such additional communities adopts the resolution or ordinance described in subsection 1 of this section and makes the findings required by subdivision (2) of section 99.330, and the commissioners of the regional authority consent to the inclusion within its area of operation of such additional communities.