The contract mentioned in section 71.400, to be valid, shall be authorized by ordinance passed by the council, board of aldermen or board of trustees of the contracting parties, which ordinances shall be uniform in their provisions, and prescribe the cost of installing the fire department, including the erection or rental of a building for the use of the department, and the maximum cost of the maintenance thereof and the amount to be contributed by each of the contracting parties to the original cost incurred in installing the department and the maximum amount of the annual appropriation for the maintenance of said department.