D.C. Mun. Regs. tit. 11, § 3405
3405.1 The Board of Zoning Adjustment may grant, by special exception, a full or partial reduction in the GAR required under this chapter if, in addition to meeting the general requirements of § 3104, the applicant demonstrates that providing the GAR is impractical as a result of equivalent sustainability measures already being implemented on the property that achieve the intent of the GAR through methods not available through the GAR requirement.
SOURCE: Final Rulemaking published at 60 DCR 10077 (July 12, 2013).