The performing arts and athletic space will share a common lobby with room for 600 guests and a hospitality and concession area, two sets of restrooms and two ticket booths.
“We'll be able to use the center for so many things,” Miller said.
High School Principal Tracy Skinner said following last year's groundbreaking ceremony that the extra room will allow programs to grow. Space has been cramped as the district has grown closer to a 6A-size.
“We're outgrowing ourself,” she said.
The building is expected to be complete by the summer of 2013.
Ground was broken a year ago. It is part of several expansion projects covered by a $142.1 million bond issue passed in 2009.
A fifth elementary school, the east end of the high school and the freshman academy all are in some state of construction, Miller said.