All subdivisions, as herein defined, shall be submitted for approval of the city council and shall comply with the provisions of these regulations. These regulations shall supplement all other regulations, and where at variance with other laws, regulations, ordinances or resolutions, the more restrictive requirements shall apply. This title shall not apply to any subdivision created and recorded prior to the effective date hereof, except for the further dividing of lots; nor is it intended by this title to repeal, abrogate, annul or in any way impair or interfere with existing provisions of other laws, ordinances or regulations or with private restrictions placed upon property by deed, covenant or other private agreements, or with restrictive covenants running with the land to which the city is a part.