District of Columbia Code Division II. Judiciary and Judicial Procedure § 16-1502. Service of summons.

(b)(1) If the summons is posted on the premises, a copy of the summons shall be mailed first class U.S. mail, postage prepaid, to the premises sought to be recovered, addressed in the name of the person known to be in possession of the premises, or, if unknown, addressed in the name of the person occupying the premises, within 3 calendar days of the date of posting.

(2) If a summons is served by posting a copy on the premises, a photograph of the posted summons must be submitted to the court. The photograph must have a readable timestamp that indicates the date and time when the summons was posted.