I think it’s already being rented, isn’t it? Well, it’s ‘mortgaged’ to the hilt, and therefore not fully owned by Everton. We are obliged to make payments in order to make use of it / claim to own it.
The vast majority of clubs would need to have loans secured against the new stadium just to get it built, and even if we were to eventually become ‘mortgage’ free, most clubs would then use that opportunity to secure further finance against the stadium.
Goodison has had lending secured on it for decades, and it prevented Elstone from completing his wacky Park End hospitality suite because the lender said “No, you don’t own Goodison, we do!”.