sentences:  After $31 million cost rise, the Penguins pledged an additional $15.5 million, while the State and Sports and Exhibition Authority split the difference.In September 2009, the State contributed an additional $5.08 million from the "Pennsylvania Gaming Economic Development and Tourism Fund" to cover a rising "interest on variable rate bonds".Populous, designers of PNC Park and Heinz Field, designed the building working with local architect Astorino to develop the construction documents, while the ICON Venue group and Oxford Development oversaw the building of the arena.