It is not intended by this Article to repeal, abrogate, annul or in any way to impair or interfere with covenants, easements or restrictions between persons, nor to rescind a Construction Permit heretofore issued by the Zoning Officer of the Borough of Tenafly. Any existing deed restrictions or contracts which prescribe within any districts a building setback, front yard or open space greater than is specified herein, shall remain in full force and effect.