The Los Angeles Catholic Cathedral [on the left hand side of the photo above] cost $190,000,000.
That went way over budget and was built several years ago.
Cost overruns seem endemic where there is a big pot of money available. I just saw the ribbon cutting ceremony for the new section of a local hospital that was supposed to be a $35,000,000 addition (to start construction in 2003 and to open in 2006). This was to be $10,000,000 in federal money (for earthquake retrofitting of existing facilities), $15,000,000 in corporate money and a $10,000,000 in funds to be raised by the hospital itself through fundraising activities. The fundraising effort fell flat on its face. Today, the speaker announced the new $75,000,000 addition to the hospital. So the hospital's parent corporation took a $50,000,000 bath on the project and opened it two years late. I'm sure some of the executives will get handsomely rewarded for their performance.
And there is even less accountability in the publis sector.