D.C. Mun. Regs. tit. 11, r. 11-I577
The maximum permitted building height, not including the penthouse or rooftop structure, in the D-8 zone shall be as follows:
| Street Right of Way Width | Maximum Permitted Building Height, Not Including Penthouse |
| Greater than or equal to 110 ft. | 130 feet |
| Less than one 110 ft. but greater than or equal to 100 ft. | 120 feet |
| Less than 100 ft. but greater than or equal to 90 ft. | 110 feet |
| Less than 90 ft. | No taller than the width of the street right of way, plus 20 feet |
The maximum permitted building height, not including the penthouse or rooftop structure, for a project that includes land within a street right-of-way that has been closed by action of the Council of the District of Columbia and that has not been incorporated into the District of Columbia official highway plan shall be one hundred ten feet (110 ft.) unless otherwise permitted by the Zoning Commission as provided for in Subtitle I § 581.
A building in the D-8 zone that fronts on Independence Avenue, S.W. between 6th Street and 12th Street, S.W. shall also be subject to the height regulations in Subtitle I § 618 governing the Independence Avenue Sub-Area and subject to Subtitle I § 581.
The maximum permitted height of a penthouse or rooftop structure shall be twenty feet (20 ft.). The maximum permitted number of stories for penthouse habitable space shall be one (1) plus a mezzanine, except a second story shall be permitted for penthouse mechanical space.
D.C. Mun. Regs. tit. 11, r. 11-I577