A hot trend in metro Denver’s real estate market is data centers, with people selling sites for the facilities and people developing the centers saying demand is outpacing supply. Flexential, a Denver-based developer and operator of data centers, recently broke ground for a 22.5-megawatt center on 17 acres in Parker. The facility will be its largest in the metro area, adding to the company’s 42 centers across 19 markets in the U.S. “In the last 24 months, there has been a significant increase in demand for data centers,” Flexential CEO Chris Downie said. Jason White,a managing director with the Denver office of the JLL real estate firm, said various transactions are in the works and there are many inquiries about sites of more than 50 acres for new data centers.