“Private mausoleum or columbarium” shall be a freestanding structure which:
(a) Is constructed for use by the members of any one group, and not for the sale of space therein to any other person.
(b) Does not contain crypts for the interment of more than 12 uncremated human remains, and a columbarium, niches for the interment of not more than 20 cremated human remains.
(c) Is not constructed for occupancy by any person except in the course of making an interment.