The value of the deal is what? 4 billion? How much margin is there on the deal? Split the margin in half. Build a 600M rink, i bet 1/2 the margin amortized over 30 years of development doesn't cover the interest carrying charge on the arena debt.
If the margin is 15%, which based on my research it's not likely to be that high, then there is 600m in margin. Half of that is 300m. Over a 30 year development that is 10m a year. Over a 20 year development it is 15m a year. Neither funds that arena. And 900 albert certainly squeezes the margins.
You can argue that he should not have to finance the arena he should pay for it. If you could do that, if you had that kind of money, why would you? Unless you were a philanthropist you wouldn't.
Arenas like what we want aren't being built in small cities in north america 100% with private money. They just aren't because you can't come up with a business model where it makes sense.
I don't wish to get into the debate about public funding either. I'm not sure what i think about it either way. Regardless of what i think about it on principal, i don't think it gets built without some significant subsidy / event surcharge
So, I've seen 600 mil for the arena thrown around a lot, only time I recall seeing somebody involved in the bid putting down a number it was 500, I think Ruddy claimed in his lawsuit or in the media that Melnyk wanted a 500 mil arena for free. Not a big gap but still... Is 600 coming from the assumption it will be the same as the Edmonton arena? If so, that's likely high given that 600 mil was the entire project which included some non-arena stuff. The actual arena portion of the Edmonton project was around 480.
Speaking of Edmonton, they did get public money, about 50% of the arena was covered by public funds, more if you count a ticket surcharge, but tbh a ticket surcharge likely eats into what they can charge so I don't know how I'd categorize that. Katz paid or is paying about a third of the cost to build the arena (about 130 mil some of it in the form of rent) and Edmonton owns it and the land, so no salvage revenue when the place has used up it's lifecycle. Katz is also responsible for maintenance and operating costs
To compare that to Melnyk's ask when everything was going sideways: rent for free and he pays operation and maintenance cost while retaining operating revenue and naming rights, well lets just say on the surface Melnyk asked for a much better deal than Katz got to salvage the deal.
The original plan to have condo's ect fund the deal probably wouldn't have covered 66% of the cost to build the arena. But, Melnyk presumable would have owned the arena. I think the biggest issue would have been floating the initial costs until revenues from the rest of the project caught up; once the arena was built, he could get a cash infusion by selling off the CTC and land.