45. (1) When it appears to the Authority that any particular development scheme is sufficiently advanced to enable the amount of the betterment fee to be determined, the Authority may, by order made in this behalf, declare that for the purpose of determining such fee the execution of the scheme shall be deemed to have been completed and shall thereupon give notice in writing to the owner of the land or any person having an interest therein that the Authority proposes to assess the amount of the betterment fee in respect of the land under section 44. (2) The Authority shall then assess the amount of betterment fee payable by the person concerned after giving such person an opportunity to be heard. (3) Any person aggrieved by the assessment of betterment fee made by the Authority under sub-section (2) may, within thirty days from the date of such assessment, appeal to the Government whose decision shall be final.