D.C. Mun. Regs. tit. 11-B, § 313
313.1 Front setback and build-to regulations are intended to control the relationship of buildings to street lot lines.
313.2 Front setbacks and build-to lines regulate the distance between a building and a front lot line.
313.3 A lot may have more than one (1) street lot line, and therefore more than one (1) front setback.
SOURCE: Final Rulemaking published at 63 DCR 2447, 2650 (March 4, 2016 – Part 2).