It is not intended by this article to repeal, abrogate, annul or in any way to impair or interfere with existing provisions of other ordinances except those specifically repealed by this article; or with private restrictions placed upon property by deed, covenant or other agreements. However, where this article imposes a greater restriction upon land, buildings or structures than is imposed by existing provisions of ordinance, contract or deed, the provisions of this article shall control. Where the provisions of this article are to become repugnant to state or federal law and cannot be reconciled therewith, the provisions of such law shall govern.