In all Residence Districts, the level of a yard or of a rear yard equivalent shall not be higher than curb level, except that natural grade level need not be disturbed in order to comply with this requirement. No building or other structure shall be erected above ground level in any required yard or rear yard equivalent, except as otherwise provided in Section 24-33 (Permitted Obstructions in Required Yards or Rear Yard Equivalents).

In all Residence Districts, the width or depth of a yard or rear yard equivalent shall be measured perpendicular to lot lines.