You are correct, we do not know exactly how much will be invested...
However, if this casino goes in Markham (or any other part of the GTA) I would suspect it would cost less than $1 billion.
Also, the fact that MGM, Caesar's, and others all want a casino resort here indicates that the best one will probably be accepted (should it come to that). They will probably go all out.
If this is part of OP/The Ex, then it will be much more than a casino. I would't be surprised if it was $6 billion.
Also, saying it doesn't belong in Toronto because we are an urban city ( I assume thats what you were trying to say? @denfromoakvillemilton) is not right. Many urban cities have casinos. We also have OP. This could go great at OP with a bunch of other things.
The truth is, 2 - 6 billion is significantly more that what would be spent outside of Toronto.
Look at what is being built in vancouver for $400 million. It looks great!!