D.C. Mun. Regs. tit. 4, § 802
802.1 All entities covered under the Act, as amended, shall allow individuals the right to use gender-specific restrooms and other gender-specific facilities such as dressing rooms, homeless shelters, and group homes that are consistent with their gender identity or expression.
802.2 All entities covered under the Act with single-occupancy restroom facilities shall use gender-neutral signage for those facilities (for example, by replacing signs that indicate "Men" and "Women" with signs that say "Restroom").
SOURCE: Final Rulemaking published at 53 DCR 8751, 8753 (October 27, 2006).