my guess is 16,000.  30 yards of cement @ 100.00==3000.00

new floor with supports                                            4000.00-- price steel through roof

power auger unload this using some old parts-             1500.00

    crane --------------------------------------------------------1000.00   they don't like to come cheaqper.

 electric, says new line but if that means service ,box and hook-ups-2500.00

       rest is labor  hope you get it done for five