The only two ways I can think of, is either Agricultural use, or some relif if you are a 'Start up' buissnes. Rates are a complete nightmare, a few years back indoor riding schools were to be classed as 'Commercial buildings' and the rates were set to rocket. Unfortunatley if you work out the earning potential of a factory as compared to a riding school, the diffrence is galactic. A compromise was worked out, but costs still rose.