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(a)        In the districts indicated, if a building containing a community facility use has an aggregate width of street walls equal to 80 feet or less or, for abutting buildings, if the combined aggregate width of street walls of all such abutting buildings on a zoning lot is equal to 80 feet or less, then two side yards shall be provided, each with a minimum required width of eight feet. If such building or buildings have an aggregate width of street walls equal to more than 80 feet, two side yards shall be provided, each equal to not less than 10 percent of the aggregate width of street walls. The provisions of this paragraph (a) shall not apply in R5D Districts. In lieu thereof, the side yard regulations set forth in Sections 23-461 and 23-462, as applicable, shall apply.  

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(b)        In the districts indicated, no side yards are required.  However, if any open area extending along a side lot line is provided at any level, it shall be at least eight feet wide. The allowances for permitted obstructions in any yard or rear yard equivalent set forth in Section 24-33 (Permitted Obstructions in Required Yards or Rear Yard Equivalents) shall be permitted in such open areas.