Do I have to explain it again?  Financial costs are part of construction costs because the city needs to make loans or float bonds to pay for construction.  The minute the city uses a General Obligation Bond to finance construction on any project, those financial costs are automatically factored into the final construction costs.
 
Now you say I'm lying?  Nowhere in the 2 articles do the words "contingency" appear.  To any person who read the article, all they see is costs went up from $5.6 billion to nearly $10 billion.  Like I said, nowhere in the article does the word contingency appear.  If you can find the word contingency in the article, I'd love to see where it appears. 
You have been proven wrong many times already.  I'm done with this, I've proved my point.  You lost, give up.