Same as any other they engage consultants they have not picked the number out of thin air vish and it stacks up with the present day cost of city's stadium too how much evidence do you need ?
Your construction inflation argument is flawed also as the price of steel still applies to redevelopment in fact more so as you need bespoke build rather than kit form as the modern stadiums are built today a friend of mine worked in the reebok and it was built in no time I would expect having to work around the other stands at anfield would nit be much difference from new build. John Henry us just penny pinching I would not be surprised to hear the difference us as little as £75m
So you're happy to accept a figure given with no basis for a rival stadium that's years and tears away yet you're not wanting to believe that FSG have done their homework and the figure they came up with both for a new stadium and a renovation? Says it all really!