The nonconforming use of land shall not be enlarged or extended beyond the area of land occupied by such use at the time of the adoption of this chapter. A nonconforming use of land may not be moved in whole or in part to any other portion of the lot or parcel of land occupied by such nonconforming use at the time of adoption of this chapter. A nonconforming use of land shall not be changed to another nonconforming use. If a nonconforming use of land is discontinued for a period of 12 consecutive months, it shall not be renewed, and any subsequent use of the land shall conform to the regulations of the district in which the land is located.