D.C. Mun. Regs. tit. 11, r. 11-820
The General Industry (M) Districts are designed to provide areas suitable for development as heavy industrial sites, but at the same time protect those industrial developments from the intrusion of non-industrial uses that impede the full utilization of properly located industrial sites.
Except as provided in § 821.2, no new residential building shall be permitted in M Districts.
Since the zoning regulations relative to operation of permitted uses are only those minimally required to protect nearby industrial and commercial uses, M Districts, whenever possible, shall not be mapped adjacent to Residence Districts.
Other than certain specifically prohibited uses, any use conforming to specified standards of external effects shall be permitted in the M Districts.
Except as provided in chapters 20 through 25 of this title, in an M District, no building or premises shall be used and no building shall be erected or altered that is arranged, intended, or designed to be used except for one (1) or more of the uses in §§ 821 through 824.
D.C. Mun. Regs. tit. 11, r. 11-820