1/ Notwithstanding the provisions of Article 593 of this Code where immovable property business leases are continued, any contractual provisions providing for immediate payment of leases before the end of such period shall be ineffective during the first four months of the observation period in reorganization proceedings or during the duration of the continuation period as provided under Article 744 in bankruptcy proceedings. 2/ Where immovable property business leases are continued, and the lessor has received payment of all lease installments at the conclusion of the lease agreement or has received adequate securities for such payment, the lessor may not demand any current and future lease installment arising after the opening of the proceedings. 3/ Notwithstanding any contractual provisions, the trustee- in bankruptcy may assign lease agreements for the remaining period; provided that the purpose for which the business premises are utilized may not be changed; Where appropriate, the supervisory judge may authorize such change.