They brought out a custom-built sandbox to hold the dirt. They also brought out Sean Payton and gave him a hard hat and shovel. The head coach joined owners Greg Penner and Carrie Walton Penner and general manager George Paton for the groundbreaking ceremony of the $175 million training center complex on a gorgeous Thursday morning at Broncos Park Powered by CommonSpirit. Tighten up the head shells. Dig! Toss! What’s striking about building a new facility is the current one, built in 1990, is still one of the best in the NFL. Ask the Kansas City Chiefs and all those former New Orleans Saints who followed Payton to Denver. So why build a new one? “The one we’ve been in right behind us for 34 years has served us really well,’’ Penner said in a sit-down interview with 9NEWS minutes after the groundbreaking ceremony. “But what we’ve found was a number of the spaces that were designed were just too small, especially the locker room.