"The mayor’s administration also is pushing back against attempts to increase the project list much beyond its current tab, because the $937 million total could be repaid using an extension of a tax rate approved by voters in 2007 for the previous bond package."

So in other words, it will show up on the ballot as 'does not increase taxes' which will get people to vote for it. I hate it when they treat tax extensions with those words on the ballot - it is deceitful.