When giving tenant’s notice in DC the new law as of December 3, 2021 is:
4200.16 Notwithstanding § 904 of the Act (D.C. Official Code § 42-3509.04), for the purposes of this chapter, service upon any person shall be completed only:
(a) By handing the document to the person, by leaving it at the person’s place of business with a responsible person in charge, or by leaving it at the person’s usual place of residence with a person of suitable age and discretion;
(b) By first class mail of the United States Postal Service, properly stamped and addressed;
(c) By electronic means if the person to be served has previously consented in writing, and has not withdrawn consent, to the electronic delivery of notices, petitions, or other documents under the Act; or
(d) By any other means that is in conformity with an order of the Commission, Rent Administrator, or Office of Administrative Hearings in the course of the proceeding for which service is made.