The lawful use or occupation of land or premises existing at the time of the adoption of a resolution hereunder may be continued, although such use or occupation does not conform to the provisions thereof, but if such nonconforming use or occupancy is discontinued for a period of more than two years, any subsequent use or occupancy of the land or premises shall be a conforming use or occupancy. If the state acquires title to any land or premises, all further use or occupancy thereof shall be a conforming use or occupancy.