The Assessor's Office automatically mails a Homeowners' Exemption Claim form with each residential property purchase or transfer. To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located.A new owner must file a claim even if the property is already receiving the Homeowners' Exemption. Complete a homestead declaration form. Sign your declaration in front of a notary. For more information click here. Us or contact one of the County. Complete form BOE-266, Claim for Homeowners'. Property Tax Exemption. Treasurer-Tax Collector San Diego County Admin.