(1) The authority may amend a project area plan by following the same procedure under this part as applies to the adoption of a project area plan.
(2) The provisions of this part apply to the authority's adoption of an amendment to a project area plan to the same extent as they apply to the adoption of a project area plan.
(3) An amendment to a project area plan does not affect the base taxable value determination for property already within the project area before the amendment.