D.C. Mun. Regs. tit. 11, r. 11-F4906
A rear yard shall be provided for each public school the minimum depth of which shall be as set forth in the following table:
TABLE F § 4906.1: MINIMUM REAR YARD FOR PUBLIC SCHOOLS
Zones | Minimum Rear Yard (ft.) |
All RA-1 zones | 20 |
All RA-2, RA-3, and RA-4 zones | 4 in. per 1 ft. of vertical distance from the mean finished grade at the middle of the rear of the structure to the highest point of the main roof or parapet wall, but not less than 15 ft. |
All RA-5 zones | 3 in. per 1 ft. of vertical distance from the mean finished grade at the middle of the rear of the structure to the highest point of the main roof or parapet wall, but not less than 12ft. |
In the case of a lot that abuts or adjoins along the rear lot line a public open space, recreation area, or reservation, no rear yard shall be required.
D.C. Mun. Regs. tit. 11, r. 11-F4906