If you can identify an area of space within office/ factory etc that is not being used, but which the over rates bill covers, then it may be possible to get a reduction. This is on an 'adhoc' basis with Council- best if this area if a total floor or area that can be lockedf off- usually you will have to agree with Revenue Collector from Council, and they may check back periodically to see that area in question is not being used.