D.C. Mun. Regs. tit. 11-U, § 501
501.1 The uses in this section shall be permitted as a matter of right in any MU zone except the MU-11 zone, subject to any applicable conditions.
501.2 Any use permitted as a matter of right in any R, RF, or RA zone shall be permitted as a matter of right in the MU, except the MU-11 zone.
501.3 Other accessory uses that are customarily incidental and subordinate to the principal uses permitted in this chapter shall be permitted.
SOURCE: Final Rulemaking published at 63 DCR 2447, 3338 (March 4, 2016 – Part 2).