My understanding, and I may be mistaken, is that upper levels of government (ie. Sport England) kicked in 2/3 of project cost, the city the remaining third and that the team was on the hook for the expansion costs. Which, using your numbers, would be about what Hamilton is asking of the Ticats and their corporate partners.
On top of that, Man City FC owner HH Sheikh Mansour bin Zayed Al Nahyan is also behind a £1 billion ($1.5b CAD) leisure project and stadium expansion
on the adjacent lands -- including a proposed five-star hotel, luxury commercial office space, high-end retail and leisure facilities and a £50m ($77m CAD) training complex for the team. (Along the way, they'll possibly end up remediating a 17-acre former coal pit.)
Scale and budgets aside, imagine these words
coming from the Ticats' camp: "The longer term considerations for the area reflect the long term commitment of our owners to the club and the community it serves."