Must we?
Don Walker writes:

Milwaukee Bucks owner Herb Kohl said Tuesday that it did not make sense to spend $50 million to $100 million to remodel the Bradley Center and said the community would have to discuss in the future the need for a new arena.
The Democratic U.S. senator, noting that it had been a joy this season to own the team, said spending millions more to remodel the facility “would not extend its useful life.”
Rather, he said, the Bradley Center board ought to consider more modest upgrades to the building that will generate new revenue for the Bucks.

The Minnesota Legislative References Library has a useful page on Minnesota Issues facing Financing Professional Sports Facilities.
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Evidently, former Governor Tommy Thompson’s recently destroyed papers included those pertaining to the financing and construction of Miller Park.