D.C. Mun. Regs. tit. 31, § 230
230.1 Pleadings, briefs, and all other documents shall be typewritten, printed, or otherwise duplicated in permanent legible form upon paper eight and one-half inches (8½ in.) wide and eleven inches (11 in.) long, and exhibits, except where impracticable, annexed thereto shall be folded to the same size.
230.2 Unless printed, the impression shall be on one (1) side of the paper only and shall be double-spaced, except that footnotes and quotations of more than two (2) lines may be single-spaced and indented.
230.3 Printed documents, except exhibits, shall be in a type not less than eleven (11) point.
230.4 Pleadings shall be bound or stapled on the left-hand side and shall have inside margins of not less than one and one-half inches (1½ in.).
230.5 Any pleadings, briefs, and other documents that do not conform to the requirements of this section shall not be accepted by the Panel.
SOURCE: Final Rulemaking published at 34 DCR 6715, 6730 (October 23, 1987).