If AEG (or whoever) was to contribute half the construction costs of the new stadium (say £200m), reimburse Spurs for half the property and project development costs incurred (say £40m) and pay half the development value of the land that Spurs already owned and upon which the new stadium will be built (say £20m), then it would still be a fantastic deal for the club. By the time that the various enabling developments are sold, maybe five years after the stadium opens, the club could even be debt free. That would be incredible when you consider how many clubs are burdened with crippling debts for years or decades after building new stadia (or even stands) that are half the size and a quarter the quality. Not having to take on huge debt cannot be underestimated.
If, as part of the deal, our stadium partner gets to keep the profits from concerts and other events that they stage, then that would be fair enough. Spurs will keep all the profits from any football (soccer) matches played at the stadium and any other events that the club organises. Same as at the current stadium, then. Only difference is that we'll have far more income from ticket and corporate sales and the income from a massive naming rights deal - more income, I suspect, than we would have earned from any naming rights deal we could sign on our own, even after our stadium partner taking its 50% share. Not forgetting, of course, that our stadium partner would have to pay half the ongoing stadium maintenance costs henceforward. That's worth another £1m or so per annum.