Any district levying or causing to be levied a tax in
accordance with the provisions of this part may levy or cause to be
levied a tax in one or more counties in excess of any maximum tax
rate established by law or pursuant to law; provided that the total
revenue to be received from the tax levies in all counties does not
exceed the total revenue which would have been received by the
district by levying the tax at the maximum rate in all counties
without complying with the provisions of this part.