These Rules and Regulations shall not be construed as abating any action now pending under, or by virtue of, prior existing subdivision regulations, or as discontinuing, abating, modifying, or altering any penalty accruing or about to accrue, or as affecting the liability of any person, firm, or corporation, or as waiving any right of the City under any section of provision existing at the time of adoption of these Rules and Regulations, or as vacating or annulling any rights obtained by any person, firm, or corporation, by lawful action of the City except as shall be expressly provided for in these Rules and Regulations.