Line extensions required pursuant to Sections 5.28.1030 or 5.28.1040 of this chapter, shall be made and completed within reasonable periods of time consistent with the relative cost and periods required for planning and construction. A franchisee shall not be deemed to be in breach of said sections until after written notice is mailed to the franchisee by the cable television commission identifying a particular extension which the commission asserts is required. If within thirty (30) calendar days following mailing of such notice the franchisee has not filed with the clerk of the board of directors of the commission a written notice specifying the date of completion of such extension, the franchisee shall be deemed to be in breach, if it has failed to comply with the requirements of said sections, from and after the expiration of the thirty (30) day period. A franchisee's designation of a completion date shall not be presumed to be reasonable or binding upon the commission. (Prior code § 20.05.428)