Except as provided by Sections 702.1, 709, and 710, any employing unit for which services that do not constitute employment are performed, may file with the director a written election that all such services performed by individuals in its employ in one or more distinct establishments or places of business shall be deemed to constitute employment by an employer for all the purposes of this division for not less than two calendar years. Upon the written approval of the election by the director, such services shall be deemed to constitute employment subject to this division from and after the date stated in the approval.