Any talk of a deal and how much SISU will charge the club should not forget a few things.
If the council were to give SISU the freehold and the ACL lease, there is still the small matter of the £14m loan and £6m that the Higgs Charity invested. I cannot imagine that anyone on the council, whatever party they represent, will sanction a deal that involves the ratepayer having to repay the loan and the charity having to write off their investment and, I would guess, that the minimum that SISU could expect to pay is £20m.
It is highly unlikely that SISU could finance that £20m at a rate any better than 7.5%, so to repay that loan, over 20 years, would cost them about £2m a year. This is probably £1.5m a year more than ACL pay out at the moment and it doesn't take much guessing where SISU will find the extra income.