Retractability on resume of Vikes architect

The Minnesota Vikings' architect selection for their new stadium, announced Friday morning, is revealing in at least one sense: Both NFL stadiums designed by the HKS Sports & Entertainment Group have retractable roofs.

Vikings owners Zygi and Mark Wilf have indicated plans for some level of retractability in their new facility, scheduled to open at the Metrodome site for the 2016 season. The team would be responsible for the additional cost, believed to be at least $25 million, but the Wilfs see value in both game-day atmosphere and the possibility of luring a professional soccer team to the area.

HKS designed Lucas Oil Stadium in Indianapolis and Cowboys Stadium in Arlington, Texas. Both have retractable roofs, and the Colts have an end zone "window wall" that lowers as well.

HKS will reveal a preliminary design in early 2013.