Submit the completed Washington State Tort Claim form to the following fax number: 360-507-9251. If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option.(b) Nothing in this section shall affect a cause of action arising from the tortious interference with contracts or business relations. Tortious interference with a contract occurs when a third party intentionally damages the contractual between two parties. We argue that the tort should be repudiated. Trespass to chattels and conversion are both intentional torts. Allow lots of garbage to build up in or around the unit. Cause a nuisance or substantial interference with other tenants' use of their property. If you believe that you were involved in an improper interference with another party, do not hesitate to reach out to Northwest Business Law LLC. Follow Opinions on the news. Follow.