code: def set_commercial_min_size(self, commercial_min_size):
          
          if not isinstance(commercial_min_size, int):
              raise DaftException("commercial_min_size should be an integer.")
  
          self._commercial_min_size = str(commercial_min_size)
          self._query_params += str(QueryParam.COMMERCIAL_MIN) + self._commercial_min_size
docs: The minimum size in sq ft.
          :param commercial_min_size:
          :return: