D.C. Mun. Regs. tit. 11-B, § 320
320.1 A required side yard shall be parallel to a side lot line and apply to the entirety of principal buildings and structures. If a required side yard intersects with a required rear yard, the larger yard shall apply for the required distance of the larger yard.
320.2 [DELETED]
SOURCE: Final Rulemaking published at 63 DCR 2447, 2650 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 66 DCR 2337 (February 22, 2019).