Notwithstanding Section 34140 or any other provision of this part, a commission established prior to January 1, 1978, shall not be vested with the powers, duties, and responsibilities of the commissioners of the housing authority, nor shall the commission operate and govern the housing authority, unless:
(a)
The ordinance adopted by the legislative body declaring a need for the commission to function in the community declares, or is subsequently amended to declare, that the commission shall be vested with the rights, powers, duties, and responsibilities of the commissioners of the housing authority; or
(b)
Prior to the effective date of this section, the commission has assumed and exercised the rights, powers, duties, and responsibilities of the commissioners of the housing authority.