The county assessor shall mail a notice on or before April 1 to claimants who are the owners of a homestead which was granted an exemption under section 77-3506, 77-3507, or 77-3508 and who are required to refile for such exemption in the current year unless the claimant has already filed the application for the current year or the county assessor has reason to believe there has been a change of circumstances so that the claimant no longer qualifies. The notice shall include the claimant’s name, the application deadlines for the current year, a list of documents that must be filed with the application, and the county assessor’s office address and telephone number.