When a nonconforming use or business involving a permanent type structure is discontinued or the structure vacated for a period of one (1) year, the nonconforming use shall be deemed abandoned and such facts shall be construed as conclusive proof of intent to abandon the nonconforming use. When a nonconforming use or business, not involving a permanent type structure, is discontinued or moved from the premises for a period of six (6) months, the nonconforming use shall be deemed abandoned and such facts shall be construed as conclusive proof of intent to abandon the nonconforming use.