Financing is available, because the people involved are rich. Banks have money and need to invest it, and land is still a good investment. Certainly, better than the stock market, the money has to be loaned or the banks don't make any money.
But, the deal is based on the builder being able to sell home & condos & offices & stores. At least enough as to make a profit big enough to pay for building the area.
So, that's the catch. Are there enough people with good enough credit, to buy the homes & businesses that will be built in the area. IF yes, the profit will be planned in so to make the arena affordable. If no, no arena.
Now, to find the developer who thinks the answer is yes. And, then hope his right.