The Jefferson County PVA estimates value for over 260,000 residential properties. To accomplish this task, automated valuation models are generated using a computer assisted mass appraisal (CAMA) system. The CAMA system uses the cost approach in conjunction with data from valid “arm’s-length” transactions to study specific neighborhoods. The Residential Department is staffed with trained deputies who review more than 32,000 transfers of residential parcels each year. These transfers are examined and characteristics such as size, age and location are analyzed to estimate value. To ensure a fair and equitable assessment, the CAMA system is monitored and updated with recent sale information.