In all Residence Districts, a non-conforming use that is listed in Use Groups IV, VI, VII, VIII, IX or X and permitted as-of-right within C7 Districts, may be changed, initially or in any subsequent change, only to a conforming use or to a commercial use permitted as-of-right in C1 Districts, other than those listed in Use Group V. In the case of any such change any associated size limitation denoted with an “S” in the underlying Use Group tables, need not apply. Eating or drinking establishments where such establishment provides entertainment with a cover charge or specified showtime, or includes a dance floor, thus permitted as a change of use, shall be subject to the enclosure provisions of Section 32-411 (In C1, C5, C6-5 or C6-7 Districts).