To apply for the Prop 60 or 90 tax base transfer, submit a completed claim form and a copy of identification showing date of birth. For more information about the Homeowners' Exemption, please call (510) 272-3770. Address.To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. Download PDF BOE-266 REV. You can submit your application by: Filling out a paper form or; Using our online portal. Both applications are available to the right. Total of 111 forms are available for Alameda County for 2024. Complete and submit the application: Obtain the right form from the county assessor's office (or their website) and fill it out accurately. Alameda Property Tax Exemptions. Eligible senior taxpayers must complete an application and supply proof of age and property ownership.