By all means, I mostly went of memory, but I can certainly dig up references for where I got stuff from. Those references might conflict with other ones though, a lot of what's out there is he said she said.
Actually, looks like two sources covers just about everything I said, so here's where it all comes from:
Lebreton arena cost:
Ruddy's countersuit claimed 500 mil.
Edmonton arena:
built for 483.5 mil
Katz group paid 1 third (my math was off, its more like 27%)
Public funds covered 50%
A ticket surchage covered the rest
* the surcharge is set by and paid to the city and covers principle plus interest on a loan of 125 mil used to build the arena
Katz responsible for maintenance and operating costs
City owns the land and arena
Lebreton
Melnyk wants the Event center rent free, not just the Sens as a tenant.
Presumably Melnyk would have owned the building; Looks like I might have gotten this one wrong, Melnyk claims he always intended it to be a Municipal Capital Facility, not sure if that can be done unless the property is owned by the city... might be hard to prove the event center has a municipal or public use if it's a private property that runs for profit events, but if he were to get that designation it would be a significant tax break.
I think everything else was framed as speculation on my part, or opinion. For example, I think the deal Melnyk allegedly asked for is better than what Katz got. Katz did get some tax breaks, too, but gave up something like 28 event days to the city at cost.