1801. RULES OF MEASUREMENT

RULES OF MEASUREMENT In the case of a building devoted to both residential and nonresidential uses, the minimum width and area of a court shall be computed as follows: When the residential and nonresidential uses are located on different floors of the building, the width and area requirements shall be computed for each use at the plane of each floor of the building; and When the residential and nonresidential uses are located on the same floor of the building, the width and area requirements for that plane shall be computed based on the requirements for a residential building. No required opening for the admission of light and natural ventilation shall open onto a court niche where the ratio between the width of court niche and the depth of court niche is less than two to one (2:1). No portion of a court niche shall be farther than three feet (3 ft.) from a point where the court niche is less than three feet (3 ft.) wide. In the case of an alteration affecting the amount of light and ventilation required by other municipal law or regulation in an existing structure, no legally required window shall be permitted to open onto a court that does not comply with the dimensions in this title. SOURCE: Final Rulemaking published at 63 DCR 2447, 2712 (March 4, 2016 – Part 2). District of Columbia Municipal Regulations Zoning Regulations of 2016: General Rules 11-C DCMR § 1801