This is all "pie in the sky by and by" at the moment.  Did you notice the magic word "if" in the following portion of the article? 

"Under the swap concept, the county would give the city the butterly [sic] lot in return for the empty eastern half of the City Hall block.

If the city could get the butterfly lot, with the parking structure demolished, at no cost, it could construct a market building for $4 million. If not, the money could pay for a market pavilion."

I wouldn't plan on going to Europe on the 'savings' just yet!