District of Columbia Code Division VII. Property. § 42-3509.04. Service.

(a) Unless otherwise provided by Rental Housing Commission regulations, any information or document required to be served upon any person shall be served upon that person, or the representative designated by that person or by the law to receive service of the documents. When a party has appeared through a representative of record, service shall be made upon that representative. Service upon a person may be completed by any of the following ways:

(b) No rent increases, whether under this chapter, the Rental Accommodations Act of 1975, the Rental Housing Act of 1977, the Rental Housing Act of 1980, or any administrative decisions issued under these acts, shall be effective until the first day on which rent is normally paid occurring more than 60 calendar days after the notice of the increase is given to the tenant; provided, that the requirements of § 42-3505.54(b) are met.