Whenever any tract of land is proposed for subdivision, before
any contract for the sale of any part thereof and before any permit
for the erection of a structure in such proposed subdivision shall
be granted, the subdividing owner or his or her authorized agent shall
apply for approval of such a proposed subdivision by submitting to
the Building Department at least 21 days prior to a regular meeting
of the Board 14 copies of a sketch plan of the proposed subdivision.