D.C. Mun. Regs. tit. 4, r. 4-722
A complaint containing a request for class certification may be filed either by an individual complainant or by an organization. Upon receipt of a notarized class action complaint, the Office shall within fifteen (15) days serve on the respondent a notice of the complaint and a copy of the complaint. The respondent shall, within ten (10) days of the receipt of the notice, file a written answer to the request for class certification.
Within thirty (30) calendar days of receipt of a notarized class action complaint, the Director shall certify the class only if all of the following are satisfied:
The decision of the Director to certify a class shall be served on the complainant and the respondent in writing. When the Director denies certification of a class, the complaint shall be considered as an individual action. The time limitations in § 712 shall begin on the date that the parties receive notification of the Director's decision to certify or to deny certification of a class.
The time limits in § 712 may be adjusted at the discretion of the Director for a complaint certified as a class action.
D.C. Mun. Regs. tit. 4, r. 4-722