Nick Kokonas, co-owner of The Alinea Group, said Monday on X he had sold his ownership of the restaurant group to an investor group led by Chicagoan Jason Weingarten. The group’s flagship restaurant, Alinea, is one of two Chicago restaurants with three Michelin stars. Among its other projects are the restaurant Roister and the cocktail lounge The Aviary. Reached by phone Tuesday morning, Kokonas said he was ready to try his hand at new projects and didn’t want his shifting focus to hold his team back. “20 years is a good round number, and I’m ready to move,” said Kokonas, who opened Alinea with chef Grant Achatz in 2005. Kokonas declined to provide financial details of the transaction. He won’t be involved in the day-to-day running of the restaurant group, he said, but would be available to the team for high-level consulting.