Tom Secrist is splitting off from Atomic Cowboy. Secrist, 64, sold the biscuits, beer and pizza spot for $3 million, along with the restaurant group’s headquarters around the corner in a house-turned-office-building at 1515 Adams St. “It feels great,” Secrist said of the closing. “It doesn’t mean that I’m out of the business … maybe I’ll go back to fix and flips on the houses … I just hope what I’ve done has helped to improve the selection of offerings on the street on the retail and restaurant end of it.” Justin Brockman, a broker at Required Properties, listed the spaces in August and was under contract by the first week of September, he said.