Whenever property in the project area has been redeveloped and thereafter is leased for a term not less than 10 years, notwithstanding mutual rights of termination, by the authority to any person or persons or whenever the authority leases real property to any person or persons for redevelopment, for a term not less than 10 years notwithstanding mutual rights of termination, the property shall be assessed and taxed in the same manner as privately owned property, and the lease or contract shall provide that the lessee shall pay taxes upon the assessed value of the entire property and not merely the assessed value of his or its leasehold interest.