D.C. Mun. Regs. tit. 27, § 819
819.1 Documentation that is required by this chapter to be served on an applicant or a respondent shall be served at the last known address of the applicant or respondent on file with the Department, or any representative thereof.
819.2 Service shall be to:
(a) The business enterprise or majority owners or any representative's mailing address as provided on the application or otherwise updated with the Department by:
(1) Personal delivery;
(2) Use of a process server;
(3) Certified or registered mail, return receipt requested; or
(b) The business enterprise or majority owners or any representative's email address as provided on the application or otherwise updated with the Department. The Department will maintain an email-generated delivery receipt system.
SOURCE: Final Rulemaking published at 39 DCR 9052 (December 4, 1992); as amended by Final Rulemaking published at 56 DCR 8439 (October 23, 2009), incorporating by reference text of Proposed Rulemaking published at 56 DCR 5622, 5637 (July 10, 2009); as amended by Final Rulemaking published at 70 DCR 010970 (August 11, 2023).