This section shall not be deemed or construed to repeal, abrogate or annul or in any way impair or interfere with existing laws of the State of New Jersey or ordinances of the Borough of Allentown, except those specifically repealed by this chapter, or with covenants, restrictions, conditions and easements running with the land to which the Borough is a party. Where this chapter imposes a greater restriction upon the land than is imposed or required by such existing covenants, restrictions, conditions and easements or existing provisions of law, ordinances or deeds of conveyance, the provisions of this chapter shall control.