If the political subdivision, in a petition of the first class, fails to file such action in a court of competent jurisdiction within such period of 60 days after the commission has made and filed its finding, or if the political subdivision, in a petition of the second class, fails to proceed diligently to submit the proposition to its voters or fails, if its voters have voted in favor of the acquisition of the lands, property, and rights, to file such action in a court of competent jurisdiction within 60 days thereafter, the owner of such lands, property, and rights may file with the commission a verified petition in writing setting forth that fact. The petition may also set forth in detail the expenditures which the owner has necessarily incurred in the proceeding before the commission.
The commission shall thereupon cause written notice, with a copy of the owners’ petition attached thereto, to be served upon the political subdivision, to appear before the commission at a time and place specified in the notice, to show cause why an order should not be made by the commission (a)finding that the political subdivision has failed to pursue diligently its rights, (b)determining that the finding as to just compensation shall no longer be of any force or effect, and (c)determining the reasonable expenditures necessarily incurred by the owner which, in the opinion of the commission, should be assessed against the political subdivision. The time specified in the notice shall be not less than 10 days subsequent to the date of service.