D.C. Mun. Regs. r. 3-104
The Chairperson shall approve or disapprove Board orders in writing with his or her signature, as may be appropriate, provided however that written orders issued in matters heard by a single member shall be signed by that member.
The Chairperson shall be legally bound to administer a Board order notwithstanding the fact that he or she may have disapproved the order.
Where a statutory provision requires that the Board act by a certain time and a timely decision is made on the record at a hearing, the Board's decision shall be deemed to have been made as of the date of such hearing regardless of the time of any subsequent release of the written memorandum opinion and order signed by the Chairperson or, where a matter is heard by a single member of the Board, the release of the written order signed by that member. In all other cases, the date of a Board or single-member decision that is memorialized in writing shall be the date set forth in the written order.
D.C. Mun. Regs. r. 3-104