The City reserves the right to lay—and permit to be laid—wires, pipes, cables, conduits, ducts, manholes and other appurtenances, and to do—or permit to be done—any underground and overhead installation or improvement that may be deemed necessary or proper by the City in, across, along, over, or under any public property occupied by the licensee and to change any curb or sidewalk or the grade of any street. In permitting others to do such work the City shall not be liable to the licensee for any damages arising out of the performance of such work by other parties. Nothing in this chapter shall be construed as to relieve any other person or corporation from liability for damage to the licensee’s facilities.