D.C. Mun. Regs. tit. 11, r. 11-K403
The maximum permitted building height and number of stories, not including the penthouse or rooftop structure, in HE shall be given in the following table:
TABLE K § 403.1: MAXIMUM PERMITTED HEIGHT AND STORIES
| HE Sub-District | Building Height Minimum Maximum | No. of Stories | |
| HE-1 (19th St.) | 26 ft. | 50 ft. | 4 |
| HE-2 (20th St.) | 40 ft. | 80 ft. | 7 |
| HE-3 (Water St.) | 80 ft. | 110 ft. | 10 |
| HE-4 (Corrections) | - | 90 ft. | 8 |
| Square E (Park) | - | 26 ft. | - |
Building height shall be measured from the lowest curb level along a street frontage abutting the lot.
A hospital located in the HE-2 zone may exceed eighty feet (80 ft.) in height, to a maximum of one hundred ten feet (110 ft.), if approved as a special exception by the Zoning Commission pursuant to Subtitle K § 416.
Penthouses and rooftop structures shall be subject to the regulations of Subtitle C, Chapter 15, and the height and story limitations specified in Subtitle K § 403.5.
The maximum permitted height of a penthouse or rooftop structure, except as limited in Subtitle C § 1501 on the roof of a detached dwelling, semi-detached dwelling, rowhouse, or flat shall be as set forth in the following table:
TABLE K § 403.5: MAXIMUM PERMITTED PENTHOUSE OR ROOFTOP STRUCTURE HEIGHT AND STORIES
| ZONE DISTRICT | Maximum Penthouse Height | Maximum Penthouse Stories |
| HE-1 | 12 ft. except 15 ft. for penthouse mechanical space | 1; second story permitted for penthouse mechanical space |
| HE-2 | 20 ft. | 1; second story permitted for penthouse mechanical space |
| HE-3, HE-4 | 20 ft. | 1 plus mezzanine; second story permitted for penthouse mechanical space |
The matter-of-right height shall serve as the maximum permitted height, penthouse and rooftop structure height, and floor area ratio for a PUD.
D.C. Mun. Regs. tit. 11, r. 11-K403