The initial document filed by any party shall state on the first page the name and post office address of the person or persons to be served with any documents filed in the proceeding.
Whenever any document is filed by any party with the hearing officer, copies shall be served by the filing party upon all parties to the proceedings.
Service may be made by regular mail, by registered or certified mail, or by personal delivery.
Service upon a party or an attorney of record or designated representative of a party shall occur at the time of hand delivery; by email if one is on record; or if by mail, to the address of record, by the postmark date plus three (3) days, as prescribed in § 411.3.
D.C. Mun. Regs. tit. 21, r. 21-417