For more information about the Homeowners' Exemption, please call (510) 272-3770. Address. The claim form, BOE-266, Claim for Homeowners' Property Tax Exemption, is available from the county assessor.Exemption. Complete form BOE-266, Claim for Homeowners'. Property Tax Exemption. Download PDF BOE-266 REV. To qualify for the homeowners' exemption, the home must have been the principal residence of the owner as of January 1 of that tax year. Welcome to the Alameda County Treasurer-Tax Collector's website. Our staff has worked hard to provide you with online services that provide useful information. Welcome to the Alameda County Treasurer-Tax Collector's website. Our staff has worked hard to provide you with online services that provide useful information.