Personally, IMO you can build something comparable to the SF Chase Center under $1 billion. You have construction companies that would make a low bid just to get a project of this magnitude.

IIFC, inflation on building materials is 14%, I'm going to go out on a limb and predict we will have a State-of-the art NBA arena in downtown Oklahoma City on the 4-square block site with similar specs as the SF Chase Center and Milwaukee's Fiserv Forum for right at $750 million for the arena itself, which includes demolition of the PSM site.

The Fiserv Forum cost $524 million for the arena itself.