1. When did you acquire this property? To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located.Complete form BOE-266, Claim for Homeowners'. Property Tax Exemption. Complete a homestead declaration form. Sign your declaration in front of a notary. A new owner will automatically receive an exemption claim form in the mail and there is no cost to file. Total of 86 forms are available for Santa Clara County for 2024. Two forms of identification or proof of address. Total of 111 forms are available for Santa Clara County for 2024.