It is not intended by this chapter to repeal, abrogate, annul or in any way impair or interfere with existing provisions of other laws or ordinances, except those specifically repealed by this chapter, or with private restrictions placed upon property by covenant, deed or other private agreement or with restrictive convenants running with the land to which the Borough is a party. Where this chapter imposes a greater restriction upon the land, building or structure than is imposed or required by such existing provisions of law, ordinance, contract or deed, the provisions of this chapter shall control.