An application must be filed with the Assessor's Office to apply for a Base Value Transfer. When qualifying seniors buy property after the deadline, then the senior can apply up to 30 days after the purchase.Official Website for Riverside County California Clerk Recorders Office. You should make a copy of your completed renewal application to keep for your records. To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. Filling out the Senior Citizens Property Tax Exemption application form involves a few steps. RP467K2 (Fillin), Instructions on form, Application for Partial Tax Exemption for Long Time Senior Citizen Residents in the City of Buffalo. Next, complete the form with accurate information regarding property ownership. Local governments and school districts offer partial exemptions. Download and complete an application form, including the section on household income.