D.C. Mun. Regs. tit. 11-I, § 537
537
537.1 A building in the D-4-R zone fronting on a designated primary or secondary street segment shall be subject to the design regulations in Subtitle I § 602.
537.2 A building in the D-4-R zone fronting on a designated primary street segment in the Mount Vernon Triangle Principal Intersection Area Sub-Area shall conform with the design requirements in Subtitle I §§ 612.5 and 612.6.
SOURCE: Final Rulemaking published at 63 DCR 2447, 3041 (March 4, 2016 – Part 2).