D.C. Mun. Regs. tit. 11-K, § 911
911.1 In the WR zone, the point chosen for measurement of height shall conform to the other provisions of this title, except that the point may be on either a public or private street.
911.2 For the purposes of applying general zoning requirements of this title:
(a) The WR-1, WR-7, and WR-8 zones shall be considered Residence zones; and
(b) The WR-2, WR-3, WR-4, WR-5, WR-6, WR-9, WR-10, WR-11, WR-12, WR-13, WR-14, and WR-15 zones shall be considered Mixed Use or Commercial Zones.
911.3 Penthouses or rooftop structure shall be subject to the regulations of Subtitle C, Chapter 15, and the height and story limitations specified in Subtitle C § 911.4.
911.4 A penthouse or rooftop structure constructed in accordance with the provisions of Subtitle C, Chapter 15 may be erected to a height in excess of that permitted, but shall not exceed the height, as measured from the surface of the roof upon which the penthouse or rooftop structure sits, in the following table:
TABLE K § 911.4: PENTHOUSE OR ROOFTOP STRUCTURE STANDARDS
| Zone | Maximum Height (ft.) | Maximum Stories |
|---|---|---|
| WR-1, WR-6 | Pursuant to Subtitle C § 1500.4 | Pursuant to Subtitle C § 1500.4 |
| WR-4, WR-5, WR-7, WR-9 | 12 feet; except 15 feet for penthouse mechanical space | 1 story; second story permitted for penthouse mechanical space |
| WR-8 | 12 feet; except 18 feet, 6 inches for penthouse mechanical space | 1 story; second story permitted for penthouse mechanical space |
| WR-3 | 20 feet | 1 story; second story permitted for penthouse mechanical space |
| 1 WR-2, WR-10, WR-11, WR-2, WR-13, WR-14, WR-15 | 20 feet | 1 story plus mezzanine; second story permitted for penthouse mechanical space |
SOURCE: Final Rulemaking published at 63 DCR 2447, 3176 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 67 DCR 11679 (October 9, 2020); as amended by Final Rulemaking published at 68 DCR 013834 (December 24, 2021).