No such nonconforming use shall be enlarged, increased, intensified, extended to occupy a greater area of structure or land or moved in whole or in part to a different portion of the lot or structures thereon, provided that:
1. Repair and maintenance of any buildings wherein there exists a nonconforming use will be permitted, provided that such maintenance and repair does not in any way constitute or result in a further expansion or intensification of a nonconforming use.
2. Minor alterations and improvements which do not constitute or require structural changes may be made in or to a building wherein a nonconforming use exists, provided that such nonconforming use will not be increased, extended or enlarged thereby.
3. Nothing herein shall prevent the strengthening or restoration to a safe and lawful condition of any part of any building which is nonconforming.