D.C. Mun. Regs. tit. 11, r. 11-2302
A public storage garage, repair garage, mechanical parking garage, or gasoline service station established or enlarged in any district except in the C-M or M Districts shall be subject to the provisions in this section.
No portion of the structure or premises to be used for any of the uses listed in § 2302.1 shall be located within twenty-five feet (25 ft.) of a Residence District unless separated from that Residence District by a street or alley.
No use listed in § 2302.1 shall have a vehicular entrance or exit connected with a street at a point closer than twenty-five feet (25 ft.) to any Residence District existing at the time the use is established, unless separated from the Residence District by a street or alley.
No driveway of any entrance or exit to any use listed in § 2302.1 shall be closer than forty feet (40 ft.) to a street intersection as measured from the intersection of the curb lines extended.
Except in a C-M or M District, all grease pits or hoists constructed or established as part of a use listed in § 2302.1 shall be within a building.
D.C. Mun. Regs. tit. 11, r. 11-2302