R1 R2 R3 R4 R5

In the districts indicated, for residences on qualifying residential sites in districts that are not otherwise subject to the provisions of paragraph (c) of Section 23-331 (Basic side yard requirements in R1 through R5 Districts), side yards shall only be required where a building containing residences on an adjacent zoning lot has a side yard adjoining the subject zoning lot. In such instances, an open area with a minimum width of five feet, measured perpendicular to the side lot line shall be provided, and extend along the entire side lot line. Obstructions permitted pursuant to Sections 23-311 and 23-312 shall be permitted in such open areas.