The commission may require the municipality to cause to be made an assessment, reassessment, valuation, revaluation, appraisal or reappraisal, or any one or all of them, of the taxable ratables of the municipality as the basis for any subsequent tax levy, and the cost thereof, whether or not directed by the commission, shall at the request of the governing body, be included in the amount of indebtedness to be refunded under this chapter. Any tax duplicate based thereon shall be used for all purposes in connection with the levy, apportionment and collection of taxes. For any or all such purposes the governing body of the municipality may employ such experts as it may deem advisable.