It is not intended by this article to repeal, abrogate, annul or interfere with any existing ordinances or enactments or with any rule, regulation or permit adopted or issued thereunder, except insofar as the same may be inconsistent or in conflict with any of the provisions of this article, provided that where this article imposes greater restrictions upon the use of buildings or land or upon the height or bulk of buildings or prescribes larger open spaces than are required by the provisions of such ordinances, enactment, rule, regulation or permit, then the provisions of this article shall control.