At the time and place specified in the order to show cause, or at such other time and place as, for good cause, is otherwise ordered by the commission, the commission shall proceed to a hearing on the petition. At such times and in such amounts as is directed by the commission, the political subdivision shall pay to the commission all extra costs as determined by the commission, which the commission incurs to comply with the requirements of this chapter, and if such amounts are not paid by the political subdivision as directed by the commission, the commission may suspend further proceedings on the petition. Evidence may be presented by the political subdivision, by each owner or claimant named in the petition, and by the commission.