In levying special assessments to pay any part of the cost of any public work or improvement, the city commission shall not exceed any limitation as to the amount thereof which may be prescribed by the general laws of the state applicable to municipalities and in force at the time it is determined by the city commission that any such work shall be done or improvement made. The city commission may, however, by ordinance, provide different procedures for levying special assessments other than those established by the general laws of the state.