Whenever any assessing district shall have foreclosed the lien of any such delinquent assessments, as provided by law, and shall have obtained title to such leasehold, contractual, or possessory interest, the chief administrative officer of the agency having jurisdiction over the lands shall be notified by registered or certified mail of such action and furnished a statement of all assessments against such leasehold, contractual, or possessory interest, and the chief administrative officer shall cause the amount of such assessments to be paid as provided in RCW 79.44.060, and upon the receipt of an assignment from such assessing district, the chief administrative officer shall cancel such lease or contract: PROVIDED, HOWEVER, That unless the assessing district making the local improvement and levying the special assessment shall have used due diligence in the foreclosure thereof, the chief administrative officer shall not be required to pay any sum in excess of what they deem to be the special benefits accruing to the state’s reversionary interest in the property: AND PROVIDED FURTHER, That if such delinquent assessment or installment shall be against a leasehold interest in freshwater harbor areas within a port district, the chief administrative officer shall notify the commissioners of that port district of the receipt of such assignment, and the commissioners shall forthwith cancel such lease.