Stop me if you've heard this one before: Due to unaccounted expenses that weren't properly budgeted, the estimated bill to San Francisco taxpayers for the upcoming Super Bowl 50 celebrations just went up. Again. The added cost this time? Half a million dollars.

It was reported early last week that Mayor Ed Lee ordered major construction projects be slowed down or put on hold entirely during Super Bowl 50 in an attempt to ease the expected traffic gridlock downtown. We now find out, via the Chronicle, that crews are working "round-the-clock shifts" on Transbay Transit Center steelwork in order to complete work ahead of the Mayor's requested construction "breather."

These round-the-clock shifts, of course, translate to added costs. Adam Alberti, a spokesman for the Transbay Joint Powers Authority, told the paper that it cost the city an additional $500,000 to finish work on the Beale Street side of the project ahead of the Super Bowl City street closures.

"[Overall] costs could have been far greater,” explained Alberti, if they had waited on finishing the work until after the three-week long closure.

The new total estimated taxpayer cost to host, as Supervisor Jane Kim called it, "a party for billionaires and special interests," comes out to $5.3 million. We can only image what this number would have been if the Super Bowl 50 Host Committee had gotten its way and convinced the city to remove Muni wires from the downtown area — a plan which, as originally proposed, would have cost the city "a seven figure number."

Super Bowl City street closures began this past Saturday and will continue through February 12.

Related: Official: Entrance To Super Bowl City Will Require Airport-Like Screening