“Design changes down the home stretch, and overtime labor costs incurred during a dash to finish in time for its Sept. 15 opening, have boosted the price of the Renée and Henry Segerstrom Concert Hall by $25 million to $27 million, leaders of the Orange County Performing Arts Center said Tuesday — a markup of about 13% above the $200-million price tag long attached to the project. The increase leaves the Costa Mesa [California] arts center with about $75 million left to raise to fund the now-$225 million concert hall and a partly built $10-million plaza.”