The overdue, over-budget Miami-Dade Performing Arts Center is at a flashpoint this week, as county officials are demanding a final cost estimate from the PAC’s designers and builders. “The builder’s contract with the county calls for the center to cost $254.6 million, but the builder has asked for $47 million more and estimates that its final extra costs could run as high as $61 million, the county said. The architect’s contract is for $25.35 million; it wants more, but won’t say how much. County Manager George Burgess vows to hold the line. The county has offered the builder an additional $8.9 million, rejected $26 million and is negotiating over the rest.”