D.C. Mun. Regs. tit. 27, r. 27-121
A case may be dismissed by an appellant or protester as a matter of right by filing a notice of dismissal at any time prior to the service of an answer or motion on the appellant or protester, or by filing a stipulation signed by each party.
A dismissal initiated by an appellant or protester not covered by Subsection 121.1 shall be approved by the Board upon terms and conditions as it deems proper.
Whenever either party fails to file documents required by these rules, respond to notices or correspondence from the Board, comply with orders of the Board, or otherwise indicate an intention not to continue the prosecution or defense of a case, the Board may issue an order to show cause why the case should not be dismissed for failure to prosecute or defend.
The Board shall specify whether a dismissal is with or without prejudice.
D.C. Mun. Regs. tit. 27, r. 27-121