Whenever, under the terms of the Charter of the city, it shall be, or shall have been, determined that an error, mistake or invalidity exists in any proceeding with reference to the improvement of any highway in this city heretofore ordered or which may be hereafter ordered improved, pursuant to the Charter, code of ordinances of this city, or that any of such proceedings or any assessment of any part of the costs of such improvements against the owners of property abutting thereon, or their property, is erroneous, invalid, illegal, unlawful or unenforceable, the City Council shall correct such error, invalidity, mistake, irregularity or illegality, and when it has been so determined that any such property has been omitted from assessment, or that there is any such invalidity, error, mistake, irregularity or illegality in any assessment or in the proceedings prior thereto with reference to such improvement, the City Council shall make the necessary correction to determine the amount justly and lawfully payable by them in accordance with the proceedings with reference to such improvement; provided, that in no case shall any amount be assessed against any such owner or his property in excess of the special benefit to his property in the enhanced value thereof by means of such improvement.
(Code 1943, Art. 54-10)