code: def set_commercial_max_size(self, commercial_max_size):
          
          if not isinstance(commercial_max_size, int):
              raise DaftException("commercial_max_size should be an integer.")
  
          self._commercial_max_size = str(commercial_max_size)
          self._query_params += str(QueryParam.COMMERCIAL_MAX) + self._commercial_max_size
docs: The maximum size in sq ft.
          :param commercial_max_size:
          :return: