Complete a homestead declaration form. Sign your declaration in front of a notary.Welcome to the homestead estimated amount page for Single Family Detached homes for Santa Clara county. To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. This is a property tax savings program for those aged 55 or older who are selling their home and buying another home. Apply in person in the Business Office and bring: Proof of birth (drivers license, passport, birth certificate or Medicare card); Your property tax bill. Form BOE-270-AH on CAA e-Forms Service Center. Homestead: This exemption can help homeowners reduce state property taxes and protect surviving spouses from creditors. These services are for people with low to moderate incomes.