A temporary permit may be authorized by the Borough Council upon recommendation of the Planning Board acting as the Board of Adjustment for a nonconforming structure or use (e.g., construction contractor, building or fair) which it deems beneficial to the public health or general welfare or which it deems necessary to promote the proper development of the community, provided that such nonconforming structure or use shall be completely removed upon expiration of the permit of time not exceeding one year and may be renewed annually for an aggregate period of not more than three years, including the original authorization.