Except as expressly set forth herein, it is not intended by this chapter to repeal, abrogate, annul or interfere with any existing ordinances or enactment, 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 chapter; provided, that where this chapter imposes greater restrictions upon the use of buildings or land, or upon the height and bulk of buildings, or prescribes larger open spaces than are required by the provisions of such ordinance, enactment, rule, regulation or permit, then the provisions of this chapter shall control.