The Capitol Improvement Authority is authorized to provide for the payment of such bonds and the rights of the holders thereof as provided in 73 O.S.1971, § 153, for other bonds issued by the Authority and to accomplish this end is further specifically authorized to assess and collect such appropriate rental charges as may be necessary for the payment of such bonds for space occupied in buildings which have been remodeled or renovated under the provisions of Section 168 of this title; provided that the bonds issued hereunder, the income and revenues from the projects herein authorized, and the expenses of operating such projects shall not be commingled with the bonds heretofore issued or the income and revenues of the buildings heretofore built or the expenses of operating such buildings.