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1. Detached buildings
   
   In the districts indicated, for zoning lots containing only single-family or two-family detached residences, two side yards, each with a minimum width of five feet, shall be provided.
2. All other buildings
   
   In the districts indicated, for zoning lots containing all other types of residences, no side yards shall be required. However, if any open area extending along a side lot line is provided at any level, it shall have a minimum width of five feet, measured perpendicular to the side lot line. 
   
   The allowances for permitted obstructions in any yard or rear yard equivalent set forth in Sections 23-311 and 23-312 shall be permitted in such open areas.