306.1 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 § 306.2.

306.2 The maximum permitted height of a penthouse or rooftop structure shall be twenty feet (20 ft.), and the maximum number stories within the penthouse or rooftop structure shall be one (1) plus a mezzanine, except that a second story for penthouse mechanical space shall be permitted.

SOURCE: Final Rulemaking published at 63 DCR 2447, 3176 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 68 DCR 013834 (December 24, 2021).