In all Residence Districts, the obstructions set forth in Section 23-311 (Permitted obstructions in all yards, courts and open areas) and 23-312 (Additional permitted obstructions generally permitted in all yards) shall be permitted within required side yards and required open areas along side lot lines. In addition, the following obstructions shall be permitted within certain portions of required side yards and required open areas along side lot lines:

1. on corner lots, enclosed accessory off-street parking spaces may be located in any portion that is within 30 feet of both side lot lines. However, in R1 or R2A Districts on zoning lots whose mean width is 45 feet or more, no portion of such structure shall be located less than five feet from any side lot line; and
2. on zoning lots other than corner lots, the permitted obstructions listed in Section 23-341 (Permitted obstructions in required rear yards or rear yard equivalents) may be located in any portion that is within 30 feet of a rear lot line or within 10 feet of a rear yard equivalent.