D.C. Mun. Regs. tit. 11-D, § 503
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503.1 A mechanical penthouse or rooftop structure with a maximum height of fifteen feet (15 ft.) and one (1) story shall be permitted on a place of worship, public recreation and community center, or an institutional building.
503.2 A penthouse or rooftop structure permitted by this section shall contain no form of habitable space, other than ancillary space associated with a rooftop deck.
SOURCE: Final Rulemaking published at 63 DCR 2447, 2834 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 63 DCR 10932 (August 26, 2016); as amended by Final Rulemaking published at 68 DCR 013834 (December 24, 2021); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).