D.C. Mun. Regs. tit. 11, r. 11-F305
A minimum rear yard shall be established for lots in the RA-1, RA-2, RA 3, RA-4 and RA-5 zones as set forth in the following table:
TABLE F § 305.1: MINIMUM REAR YARD
Zone | Minimum Rear Yard |
RA-1 | 20 ft. |
RA-2 | A distance equal to 4 in. per 1 ft. of principal building height but not less than 15 ft. |
RA-3 | A distance equal to 4 in. per 1 ft. of principal building height but not less than 15 ft. |
RA-4 | A distance equal to 4 in. per 1 ft. of principal building height but not less than 15 ft. |
RA-5 | A distance equal to 3 in. per 1 ft. of principal building height but not less than 12 ft. |
In the case of a through lot or a corner lot abutting three (3) or more streets, the depth of a rear yard may be measured from the center line of the street abutting the lot at the rear of the structure.
In the case of a building existing on or before May 12, 1958, an extension or addition may be made to the building into the required rear yard; provided, that the extension or addition shall be limited to that portion of the rear yard included in the building area on May 12, 1958.
D.C. Mun. Regs. tit. 11, r. 11-F305