Thats laughable, no way anyone would require more than 3.5-4%. You're not seriously comparing residential debt with that of a 100+ year old successful commercial organization with 100 years of gate receipts, that has one of the worlds richest men willing to guarantee against default as well as draw against his naming rights deal?
The reason Everton went to the city about funding was not so they could use it, but so that they could leverage it and the rates in negotiations with other investors, including a number of lenders and organizations who would very much like to both make a return, and get on Uncle Al's good side. Funding for an operation where the super billionaire best friend just dropped 30 million just for the first refusal of naming rights is the easy part.