The Zoning Administrator may permit a legal nonconforming single-family dwelling or manufactured home that is located in a C-1, C-2, C-3, I-1, or I-2 District to be enlarged or increase the lot size, without the approval of the Board of Appeals, provided such change or enlargement shall not result in:
(a) A front yard of less than 10 feet;
(b) Two side yards of less than five feet; and
(c) A rear yard of less than 15 feet.