(1) When determining the market value of commercial properties, department appraisers will consider, if the necessary information is available, an income approach valuation.

(2) If the department is not able to develop an income model with a valid capitalization rate based on the stratified direct market analysis, the band-of-investment method, or another accepted method, or is not able to collect sound income and expense data, the final value chosen for ad valorem tax purposes will be based on the cost approach or, if appropriate, the market approach to value. The final valuation is that which most accurately estimates market value.