No lease of any public building or part of any public building under the provisions of section 48-08-06 may be for a longer term than two years, except as may be otherwise provided by city ordinance or by resolution of the board of county commissioners. Such lease must be to a responsible party offering the highest return to the political subdivision and the use or occupation of the building may not interfere with the use of such building for public purposes. The governing body may reserve the right to reject any and all bids.