Different property owners with Mills Act contracts may receive different property tax reductions depending on how long they have owned the property and the property’s existing assessed value. The City does not control or set the assessed value of property under the Mills Act contract. This value and the ultimate property tax paid by the property owner is determined by the Orange County Assessor, using a formula that is established by the state Mills Act Legislation. If you have specific questions about the potential assessed value of your property under a Mills Act contract, please contact the Orange County Assessor – Special Properties Division at (714) 834-2727.