If you're referencing what I think you are referencing then you are talking about SISU's negotiations with Higgs not CCC. SISU proposed purchasing Higgs share of ACL and as part of that deal the lease would be extended to 125 years which would have needed the approval of CCC. They entered into a period of exclusivity with Higgs however when they tried to extend the exclusivity period Higgs refused.
In the judicial review Justice Hickinbottom referred to this deal and stated there was"no possible way the council would be willing to agree a transaction with Sisu"
Draft Heads of Terms were
indeed
signed by the Council and SISU, on 2 August 2012. Those more or less
reiterated the principles of the SISU plan I have already outlined, i.e. (i) SISU would
purchase the Higgs Charity’s share of ACL, (ii)SISU would discharge and write off
the Bank loan debt, in return for the
lease to ACL being extended to 125 years, and
(iii) rent was to be agreed between CCFC and ACL.
To be clear then, the Council and SISU signed the draft terms to extend the lease. SISU were definitely aware that the lease could be extended.