In order to secure the prompt payment of the principal and interest upon such revenue bonds and the proper application of the revenue pledged thereto, the board of county commissioners is authorized to covenant as to the use and disposition of the proceeds of the sale of such bonds, to covenant as to the operation of the home for the aged and to covenant as to the collection and disposition of the revenues derived from such operation, and to fix charges and fees to be imposed in connection with and for the use of the home for the aged and the addition and the facilities supplied thereby, which charges and fees shall be considered to be income and revenues derived from the operation of the home for the aged and the addition, and to make and enforce such rules and regulations with reference to the use of the home for the aged and the addition for the accomplishment of the purposes of this act and to make covenants other than and in addition to those herein expressly mentioned of such character as may be considered necessary or advisable to effect the purposes of this act.

All such agreements and covenants entered into by the board of county commissioners shall be binding in all respects upon the board of county commissioners and their officials, agents, employees and upon their successors, and all such agreements and covenants shall be enforceable by appropriate action or suit at law or in equity which may be brought by any holder or holders of bonds issued hereunder against the board of county commissioners, or their officials, agents, employees or their successors. The rents, charges and fees to be imposed under the provisions of this act shall not be limited by the provisions of any prior act.