i don't remember exact figures because this was 3 years ago, but tropical park would be the cost of the land, the cost of stadium construction, and somewhere around $14-20 million from the state to build direct on/off ramps to the stadium site off of the 826 to prevent bird and miller from clogging up. baylor's new stadium cost $266 million to build. it seats just under 45k and is probably the closest thing to what we need that we can judge costs from. i don't know what the construction cost index is for miami compared to waco, but it's definitely more expensive. also tropical park would come at extortion prices because the city has no reason to sell the land and we have no leverage to get it.
the other sites past the hammocks on the west side of the city were the cost of land, stadium construction costs, $125-175 million from the state alone to construct/expand new roads, and we actually ended up losing count of the property values of what would need to be demolished in order to widen the roads enough (it was in the hundreds of millions). that's all discounting the inevitable lawsuits from displaced businesses and homes if the state were to somehow claim eminent domain over those properties for highway road construction, which would also be fought tooth and nail by the city to begin with.
the biggest problem that we have isn't the fundraising, it's the politics. the lands out west would require the state to justify spending tons of money to displace homes and businesses as well as build roads to a stadium that would suit our needs, but isn't big enough to be a premier venue for shows/events. the potential for revenue at a site on the remote outskirts of the city isn't as high as it is at the existing stadium (sun life). tropical park is municipal and buying city land like that, especially that much prime property in the middle of an urban area, is a battle in itself. like i said, it's not impossible, but you'd have to find the right person to lobby to the right politicians, have the right timing, and have the business plan to make it a profitable venture.