Written motions and all other pleadings shall be served on all parties.
When filed, all pleadings shall be accompanied by proof of service upon all parties. Proof of service of any pleading shall be by certificate of service, affidavit or affirmation regarding delivery, or acknowledgement of receipt.
Service of pleadings shall be made by one of the following methods:
Service by mail is complete upon mailing.
Service on a general partner shall be valid service on the partnership.
Service on an officer or director or registered agent of a corporation or association shall be valid service on that corporation or association.
When any party is represented in a specific proceeding by an attorney, service of all pleadings in that proceeding shall be made upon the attorney and that service shall be considered service upon that party or those parties.
D.C. Mun. Regs. tit. 26, r. 26-A3814