The County shall construct roadways, alleys, curbs, sidewalks, gutters, and storm drainage incident to any construction in the County after a determination that the improvements are necessary and desirable. It is provided, however, that before any such determination is made, the County shall give at least two (2) weeks' notice by letters written to the assessed owners of record of all property proposed to be subject to an assessment for the improvements and mailed to such owners at their addresses as are shown on the assessment records of the County, and also by advertisement, published at least once a week for two (2) successive weeks in three (3) newspapers published in the County, which have a circulation in the area affected. The letter and advertisement or notice shall state the date on which such determination by a hearing shall be made and give a brief description of the proposed improvements, and warn all owners to appear at a time and place stated in the letter, advertisement or notice, to show cause, if any, why such improvements should be made as proposed. For private roadways and rights-of-way, except roadways and rights-of-way owned by associations or entities established for condominiums, the Council may, upon petition signed by the owners of all property abutting the front footage affected, make the determination required under Subsection (a) of this Section. Assessments for improvements undertaken pursuant to this Section shall be made in accordance with Section 23-147 of this Code.