No side yard is required for a building or structure in the NC-1 zone other than a detached or semi-detached dwelling; however, if a side yard is provided, it shall be at least two inches (2 in.) wide for each one foot (1 ft.) of height of building, but no less than six feet (6 ft.).
A minimum side yard of eight feet (8 ft.) shall be provided for a detached or semidetached dwelling in the NC-1 zone.
D.C. Mun. Regs. tit. 11, r. 11-H306