Obviously the business activities of your tenant have a fundamental impact on not only the pricing of your insurance but also the terms and conditions.  Not only will your pricing change from tenant to tenant but your insurer may also have to change.  If for example, the occupancy alters from a metal engineering supplies business to a chemical manufacturer then there is a very good chance your current insurer will not want the risk associated with the new tenant.  Failure to notify the insurer of the change in tenant could very well render your insurance policy void.  ALWAYS consider the impact of any change in tenancy on your insurance programme.