House Bill 1431 and Senate Bill 1457 propose amendments to Chapter 568 of the Private Acts of 1939, which has undergone several amendments since its inception. The primary change involves the deletion of Article XII and its replacement with a new Article IX, which is noted to be repealed by a 2025 Amendment. This restructuring aims to update the legal framework governing the City of Portland.

The bill stipulates that it will only take effect if approved by a two-thirds (2/3) vote of the City of Portland's legislative body. The presiding officer of this body is responsible for proclaiming the approval or disapproval of the act and certifying it to the secretary of state. While the act will become effective immediately for the purpose of approval or rejection, it will only be fully effective for other purposes once the legislative body's approval is secured.