Download PDF BOE-266 REV. To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located.Buy a declared homestead form from an office-supply store, or download a form from the Registrar-Recorder's website. Assessor Services: 909.387.8307. Complete a homestead declaration form. 0117). How to Apply for the Homeowners'. Exemption. Complete form BOE-266, Claim for Homeowners'. Before you use this form, fill in all blanks, and make whatever changes are appropriate and necessary to your particular transaction. Consult a lawyer if. Listed below are some common questions frequently asked about programs to lower your tax bills.