D.C. Code § 1-204.104

If a majority of the registered qualified electors voting on a referred act vote to disapprove the act, such action shall be deemed a rejection of the act or that portion of the act on the referendum ballot and no action may be taken by the Council of the District of Columbia with regard to the matter presented at referendum for the 365 days following the date of the District of Columbia Board of Elections and Ethics’ certification of the vote concerning the referendum.