D.C. Mun. Regs. tit. 14, r. 14-3906
In the event of the death, dissolution, reorganization, or change of ownership or interest of a party, the Rent Administrator may, upon his or her own motion when such an event is suggested by any documents filed, or upon the motion of a party, substitute or add a person, including a trust, estate, or representative, as a party to the proceeding.
If it appears to the Rent Administrator that the identity of the parties has been incorrectly determined, the Rent Administrator may substitute or add the correct parties on his or her own motion.
No substitution or addition of parties may occur unless all current and proposed parties are served with the motion in accordance with § 3911 and given an opportunity to file written arguments in support of or in opposition to a motion for substitution of parties. The Rent Administrator may require a current or proposed party to file documentation establishing the relationship or interest of the party to be substituted.
D.C. Mun. Regs. tit. 14, r. 14-3906